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By doing this we should be able to reduce the overhead and can consolidate all of the list addition bits in one spot. While changing out the code I also opted to go for a bit more thread safe approach to getting the boolean value. This way we can avoid possible cache line bouncing of the batched entropy between CPUs. Signed-off-by: Alexander Duyck --- include/linux/mmzone.h | 12 -------- mm/page_alloc.c | 70 +++++++++++++++++++++++++++--------------------- mm/shuffle.c | 40 ++++++++++++++++----------- mm/shuffle.h | 12 ++++++++ 4 files changed, 75 insertions(+), 59 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 8b5f758942a2..62bfb5a280ce 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -116,18 +116,6 @@ static inline void add_to_free_area_tail(struct page *page, struct free_area *ar area->nr_free++; } -#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR -/* Used to preserve page allocation order entropy */ -void add_to_free_area_random(struct page *page, struct free_area *area, - int migratetype); -#else -static inline void add_to_free_area_random(struct page *page, - struct free_area *area, int migratetype) -{ - add_to_free_area(page, area, migratetype); -} -#endif - /* Used for pages which are on another list */ static inline void move_to_free_area(struct page *page, struct free_area *area, int migratetype) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 5b799e11fba3..3f8d5afe61fa 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -878,6 +878,36 @@ static inline struct capture_control *task_capc(struct zone *zone) #endif /* CONFIG_COMPACTION */ /* + * If this is not the largest possible page, check if the buddy + * of the next-highest order is free. If it is, it's possible + * that pages are being freed that will coalesce soon. In case, + * that is happening, add the free page to the tail of the list + * so it's less likely to be used soon and more likely to be merged + * as a higher order page + */ +static inline bool +buddy_merge_likely(unsigned long pfn, unsigned long buddy_pfn, + struct page *page, unsigned int order) +{ + struct page *higher_page, *higher_buddy; + unsigned long combined_pfn; + + if (order >= MAX_ORDER - 2) + return false; + + if (!pfn_valid_within(buddy_pfn)) + return false; + + combined_pfn = buddy_pfn & pfn; + higher_page = page + (combined_pfn - pfn); + buddy_pfn = __find_buddy_pfn(combined_pfn, order + 1); + higher_buddy = higher_page + (buddy_pfn - combined_pfn); + + return pfn_valid_within(buddy_pfn) && + page_is_buddy(higher_page, higher_buddy, order + 1); +} + +/* * Freeing function for a buddy system allocator. * * The concept of a buddy system is to maintain direct-mapped table @@ -906,11 +936,12 @@ static inline void __free_one_page(struct page *page, struct zone *zone, unsigned int order, int migratetype) { - unsigned long combined_pfn; + struct capture_control *capc = task_capc(zone); unsigned long uninitialized_var(buddy_pfn); - struct page *buddy; + unsigned long combined_pfn; + struct free_area *area; unsigned int max_order; - struct capture_control *capc = task_capc(zone); + struct page *buddy; max_order = min_t(unsigned int, MAX_ORDER, pageblock_order + 1); @@ -979,35 +1010,12 @@ static inline void __free_one_page(struct page *page, done_merging: set_page_order(page, order); - /* - * If this is not the largest possible page, check if the buddy - * of the next-highest order is free. If it is, it's possible - * that pages are being freed that will coalesce soon. In case, - * that is happening, add the free page to the tail of the list - * so it's less likely to be used soon and more likely to be merged - * as a higher order page - */ - if ((order < MAX_ORDER-2) && pfn_valid_within(buddy_pfn) - && !is_shuffle_order(order)) { - struct page *higher_page, *higher_buddy; - combined_pfn = buddy_pfn & pfn; - higher_page = page + (combined_pfn - pfn); - buddy_pfn = __find_buddy_pfn(combined_pfn, order + 1); - higher_buddy = higher_page + (buddy_pfn - combined_pfn); - if (pfn_valid_within(buddy_pfn) && - page_is_buddy(higher_page, higher_buddy, order + 1)) { - add_to_free_area_tail(page, &zone->free_area[order], - migratetype); - return; - } - } - - if (is_shuffle_order(order)) - add_to_free_area_random(page, &zone->free_area[order], - migratetype); + area = &zone->free_area[order]; + if (is_shuffle_order(order) ? shuffle_pick_tail() : + buddy_merge_likely(pfn, buddy_pfn, page, order)) + add_to_free_area_tail(page, area, migratetype); else - add_to_free_area(page, &zone->free_area[order], migratetype); - + add_to_free_area(page, area, migratetype); } /* diff --git a/mm/shuffle.c b/mm/shuffle.c index 3ce12481b1dc..345cb4347455 100644 --- a/mm/shuffle.c +++ b/mm/shuffle.c @@ -4,7 +4,6 @@ #include #include #include -#include #include #include "internal.h" #include "shuffle.h" @@ -183,25 +182,34 @@ void __meminit __shuffle_free_memory(pg_data_t *pgdat) shuffle_zone(z); } -void add_to_free_area_random(struct page *page, struct free_area *area, - int migratetype) +struct batched_bit_entropy { + unsigned long entropy_bool; + int position; +}; + +static DEFINE_PER_CPU(struct batched_bit_entropy, batched_entropy_bool); + +bool __shuffle_pick_tail(void) { - static u64 rand; - static u8 rand_bits; + struct batched_bit_entropy *batch; + unsigned long entropy; + int position; /* - * The lack of locking is deliberate. If 2 threads race to - * update the rand state it just adds to the entropy. + * We shouldn't need to disable IRQs as the only caller is + * __free_one_page and it should only be called with the zone lock + * held and either from IRQ context or with local IRQs disabled. */ - if (rand_bits == 0) { - rand_bits = 64; - rand = get_random_u64(); + batch = raw_cpu_ptr(&batched_entropy_bool); + position = batch->position; + + if (--position < 0) { + batch->entropy_bool = get_random_long(); + position = BITS_PER_LONG - 1; } - if (rand & 1) - add_to_free_area(page, area, migratetype); - else - add_to_free_area_tail(page, area, migratetype); - rand_bits--; - rand >>= 1; + batch->position = position; + entropy = batch->entropy_bool; + + return 1ul & (entropy >> position); } diff --git a/mm/shuffle.h b/mm/shuffle.h index 777a257a0d2f..0723eb97f22f 100644 --- a/mm/shuffle.h +++ b/mm/shuffle.h @@ -3,6 +3,7 @@ #ifndef _MM_SHUFFLE_H #define _MM_SHUFFLE_H #include +#include /* * SHUFFLE_ENABLE is called from the command line enabling path, or by @@ -22,6 +23,7 @@ enum mm_shuffle_ctl { DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key); extern void page_alloc_shuffle(enum mm_shuffle_ctl ctl); extern void __shuffle_free_memory(pg_data_t *pgdat); +extern bool __shuffle_pick_tail(void); static inline void shuffle_free_memory(pg_data_t *pgdat) { if (!static_branch_unlikely(&page_alloc_shuffle_key)) @@ -43,6 +45,11 @@ static inline bool is_shuffle_order(int order) return false; return order >= SHUFFLE_ORDER; } + +static inline bool shuffle_pick_tail(void) +{ + return __shuffle_pick_tail(); +} #else static inline void shuffle_free_memory(pg_data_t *pgdat) { @@ -60,5 +67,10 @@ static inline bool is_shuffle_order(int order) { return false; } + +static inline bool shuffle_pick_tail(void) +{ + return false; +} #endif #endif /* _MM_SHUFFLE_H */ From patchwork Wed Aug 21 14:59:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11107231 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8A3FF1399 for ; 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To enable that I am moving the set and get operations for pcppage_migratetype into the mm/internal.h header so that they can be used outside of the page_alloc.c file. Signed-off-by: Alexander Duyck --- mm/internal.h | 18 ++++++++++++++++++ mm/page_alloc.c | 18 ------------------ 2 files changed, 18 insertions(+), 18 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index 0d5f720c75ab..e4a1a57bbd40 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -549,6 +549,24 @@ static inline bool is_migrate_highatomic_page(struct page *page) return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC; } +/* + * A cached value of the page's pageblock's migratetype, used when the page is + * put on a pcplist. Used to avoid the pageblock migratetype lookup when + * freeing from pcplists in most cases, at the cost of possibly becoming stale. + * Also the migratetype set in the page does not necessarily match the pcplist + * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any + * other index - this ensures that it will be put on the correct CMA freelist. + */ +static inline int get_pcppage_migratetype(struct page *page) +{ + return page->index; +} + +static inline void set_pcppage_migratetype(struct page *page, int migratetype) +{ + page->index = migratetype; +} + void setup_zone_pageset(struct zone *zone); extern struct page *alloc_new_node_page(struct page *page, unsigned long node); #endif /* __MM_INTERNAL_H */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 3f8d5afe61fa..c1f9a80b3f28 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -185,24 +185,6 @@ static int __init early_init_on_free(char *buf) } early_param("init_on_free", early_init_on_free); -/* - * A cached value of the page's pageblock's migratetype, used when the page is - * put on a pcplist. Used to avoid the pageblock migratetype lookup when - * freeing from pcplists in most cases, at the cost of possibly becoming stale. - * Also the migratetype set in the page does not necessarily match the pcplist - * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any - * other index - this ensures that it will be put on the correct CMA freelist. - */ -static inline int get_pcppage_migratetype(struct page *page) -{ - return page->index; -} - -static inline void set_pcppage_migratetype(struct page *page, int migratetype) -{ - page->index = migratetype; -} - #ifdef CONFIG_PM_SLEEP /* * The following functions are used by the suspend/hibernate code to temporarily From patchwork Wed Aug 21 14:59:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11107237 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 712D4112C for ; 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As it turns out most of the accessors were always just being directly passed &zone->free_area[order] anyway so it would make sense to just fold that into the function itself and pass the zone and order as arguments instead of the free area. In order to be able to reference the zone we need to move the declaration of the functions down so that we have the zone defined before we define the list manipulation functions. Reviewed-by: Dan Williams Signed-off-by: Alexander Duyck --- include/linux/mmzone.h | 70 ++++++++++++++++++++++++++---------------------- mm/page_alloc.c | 30 ++++++++------------- 2 files changed, 49 insertions(+), 51 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 62bfb5a280ce..73b541cbeaae 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -100,29 +100,6 @@ struct free_area { unsigned long nr_free; }; -/* Used for pages not on another list */ -static inline void add_to_free_area(struct page *page, struct free_area *area, - int migratetype) -{ - list_add(&page->lru, &area->free_list[migratetype]); - area->nr_free++; -} - -/* Used for pages not on another list */ -static inline void add_to_free_area_tail(struct page *page, struct free_area *area, - int migratetype) -{ - list_add_tail(&page->lru, &area->free_list[migratetype]); - area->nr_free++; -} - -/* Used for pages which are on another list */ -static inline void move_to_free_area(struct page *page, struct free_area *area, - int migratetype) -{ - list_move(&page->lru, &area->free_list[migratetype]); -} - static inline struct page *get_page_from_free_area(struct free_area *area, int migratetype) { @@ -130,15 +107,6 @@ static inline struct page *get_page_from_free_area(struct free_area *area, struct page, lru); } -static inline void del_page_from_free_area(struct page *page, - struct free_area *area) -{ - list_del(&page->lru); - __ClearPageBuddy(page); - set_page_private(page, 0); - area->nr_free--; -} - static inline bool free_area_empty(struct free_area *area, int migratetype) { return list_empty(&area->free_list[migratetype]); @@ -795,6 +763,44 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat) return !pgdat->node_start_pfn && !pgdat->node_spanned_pages; } +/* Used for pages not on another list */ +static inline void add_to_free_list(struct page *page, struct zone *zone, + unsigned int order, int migratetype) +{ + struct free_area *area = &zone->free_area[order]; + + list_add(&page->lru, &area->free_list[migratetype]); + area->nr_free++; +} + +/* Used for pages not on another list */ +static inline void add_to_free_list_tail(struct page *page, struct zone *zone, + unsigned int order, int migratetype) +{ + struct free_area *area = &zone->free_area[order]; + + list_add_tail(&page->lru, &area->free_list[migratetype]); + area->nr_free++; +} + +/* Used for pages which are on another list */ +static inline void move_to_free_list(struct page *page, struct zone *zone, + unsigned int order, int migratetype) +{ + struct free_area *area = &zone->free_area[order]; + + list_move(&page->lru, &area->free_list[migratetype]); +} + +static inline void del_page_from_free_list(struct page *page, struct zone *zone, + unsigned int order) +{ + list_del(&page->lru); + __ClearPageBuddy(page); + set_page_private(page, 0); + zone->free_area[order].nr_free--; +} + #include void build_all_zonelists(pg_data_t *pgdat); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c1f9a80b3f28..fd01031f733d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -921,7 +921,6 @@ static inline void __free_one_page(struct page *page, struct capture_control *capc = task_capc(zone); unsigned long uninitialized_var(buddy_pfn); unsigned long combined_pfn; - struct free_area *area; unsigned int max_order; struct page *buddy; @@ -958,7 +957,7 @@ static inline void __free_one_page(struct page *page, if (page_is_guard(buddy)) clear_page_guard(zone, buddy, order, migratetype); else - del_page_from_free_area(buddy, &zone->free_area[order]); + del_page_from_free_list(buddy, zone, order); combined_pfn = buddy_pfn & pfn; page = page + (combined_pfn - pfn); pfn = combined_pfn; @@ -992,12 +991,11 @@ static inline void __free_one_page(struct page *page, done_merging: set_page_order(page, order); - area = &zone->free_area[order]; if (is_shuffle_order(order) ? shuffle_pick_tail() : buddy_merge_likely(pfn, buddy_pfn, page, order)) - add_to_free_area_tail(page, area, migratetype); + add_to_free_list_tail(page, zone, order, migratetype); else - add_to_free_area(page, area, migratetype); + add_to_free_list(page, zone, order, migratetype); } /* @@ -2001,13 +1999,11 @@ void __init init_cma_reserved_pageblock(struct page *page) * -- nyc */ static inline void expand(struct zone *zone, struct page *page, - int low, int high, struct free_area *area, - int migratetype) + int low, int high, int migratetype) { unsigned long size = 1 << high; while (high > low) { - area--; high--; size >>= 1; VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); @@ -2021,7 +2017,7 @@ static inline void expand(struct zone *zone, struct page *page, if (set_page_guard(zone, &page[size], high, migratetype)) continue; - add_to_free_area(&page[size], area, migratetype); + add_to_free_list(&page[size], zone, high, migratetype); set_page_order(&page[size], high); } } @@ -2179,8 +2175,8 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, page = get_page_from_free_area(area, migratetype); if (!page) continue; - del_page_from_free_area(page, area); - expand(zone, page, order, current_order, area, migratetype); + del_page_from_free_list(page, zone, current_order); + expand(zone, page, order, current_order, migratetype); set_pcppage_migratetype(page, migratetype); return page; } @@ -2188,7 +2184,6 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, return NULL; } - /* * This array describes the order lists are fallen back to when * the free lists for the desirable migrate type are depleted @@ -2254,7 +2249,7 @@ static int move_freepages(struct zone *zone, VM_BUG_ON_PAGE(page_zone(page) != zone, page); order = page_order(page); - move_to_free_area(page, &zone->free_area[order], migratetype); + move_to_free_list(page, zone, order, migratetype); page += 1 << order; pages_moved += 1 << order; } @@ -2370,7 +2365,6 @@ static void steal_suitable_fallback(struct zone *zone, struct page *page, unsigned int alloc_flags, int start_type, bool whole_block) { unsigned int current_order = page_order(page); - struct free_area *area; int free_pages, movable_pages, alike_pages; int old_block_type; @@ -2441,8 +2435,7 @@ static void steal_suitable_fallback(struct zone *zone, struct page *page, return; single_page: - area = &zone->free_area[current_order]; - move_to_free_area(page, area, start_type); + move_to_free_list(page, zone, current_order, start_type); } /* @@ -3113,7 +3106,6 @@ void split_page(struct page *page, unsigned int order) int __isolate_free_page(struct page *page, unsigned int order) { - struct free_area *area = &page_zone(page)->free_area[order]; unsigned long watermark; struct zone *zone; int mt; @@ -3139,7 +3131,7 @@ int __isolate_free_page(struct page *page, unsigned int order) /* Remove page from free list */ - del_page_from_free_area(page, area); + del_page_from_free_list(page, zone, order); /* * Set the pageblock if the isolated page is at least half of a @@ -8560,7 +8552,7 @@ void zone_pcp_reset(struct zone *zone) pr_info("remove from free list %lx %d %lx\n", pfn, 1 << order, end_pfn); #endif - del_page_from_free_area(page, &zone->free_area[order]); + del_page_from_free_list(page, zone, order); for (i = 0; i < (1 << order); i++) SetPageReserved((page+i)); pfn += (1 << order); From patchwork Wed Aug 21 14:59:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11107239 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7C80D13A4 for ; Wed, 21 Aug 2019 14:59:56 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 138AA233FE for ; 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To accomplish this, this patch adds the concept of a Reported Buddy, which is essentially meant to just be the Uptodate flag used in conjunction with the Buddy page type. It adds a set of pointers we shall call "boundary" which represents the upper boundary between the unreported and reported pages. The general idea is that in order for a page to cross from one side of the boundary to the other it will need to go through the reporting process. Ultimately a free_list has been fully processed when the boundary has been moved from the tail all they way up to occupying the first entry in the list. Doing this we should be able to make certain that we keep the reported pages as one contiguous block in each free list. This will allow us to efficiently manipulate the free lists whenever we need to go in and start sending reports to the hypervisor that there are new pages that have been freed and are no longer in use. An added advantage to this approach is that we should be reducing the overall memory footprint of the guest as it will be more likely to recycle warm pages versus trying to allocate the reported pages that were likely evicted from the guest memory. Since we will only be reporting one zone at a time we keep the boundary limited to being defined for just the zone we are currently reporting pages from. Doing this we can keep the number of additional pointers needed quite small. To flag that the boundaries are in place we use a single bit in the zone to indicate that reporting and the boundaries are active. The determination of when to start reporting is based on the tracking of the number of free pages in a given area versus the number of reported pages in that area. We keep track of the number of reported pages per free_area in a separate zone specific area. We do this to avoid modifying the free_area structure as this can lead to false sharing for the highest order with the zone lock which leads to a noticeable performance degradation. Signed-off-by: Alexander Duyck --- include/linux/mmzone.h | 52 ++++++ include/linux/page-flags.h | 11 + include/linux/page_reporting.h | 177 +++++++++++++++++++++ mm/Kconfig | 5 + mm/Makefile | 1 mm/memory_hotplug.c | 1 mm/page_alloc.c | 114 +++++++++++++- mm/page_reporting.c | 336 ++++++++++++++++++++++++++++++++++++++++ 8 files changed, 687 insertions(+), 10 deletions(-) create mode 100644 include/linux/page_reporting.h create mode 100644 mm/page_reporting.c diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 73b541cbeaae..4a80bb50b226 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -462,6 +462,14 @@ struct zone { seqlock_t span_seqlock; #endif +#ifdef CONFIG_PAGE_REPORTING + /* + * Pointer to reported page tracking statistics array. The size of + * the array is MAX_ORDER - PAGE_REPORTING_MIN_ORDER. NULL when + * unused page reporting is not present. + */ + unsigned long *reported_pages; +#endif int initialized; /* Write-intensive fields used from the page allocator */ @@ -537,6 +545,14 @@ enum zone_flags { ZONE_BOOSTED_WATERMARK, /* zone recently boosted watermarks. * Cleared when kswapd is woken. */ + ZONE_PAGE_REPORTING_REQUESTED, /* zone enabled page reporting and has + * requested flushing the data out of + * higher order pages. + */ + ZONE_PAGE_REPORTING_ACTIVE, /* zone enabled page reporting and is + * activly flushing the data out of + * higher order pages. + */ }; static inline unsigned long zone_managed_pages(struct zone *zone) @@ -763,6 +779,8 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat) return !pgdat->node_start_pfn && !pgdat->node_spanned_pages; } +#include + /* Used for pages not on another list */ static inline void add_to_free_list(struct page *page, struct zone *zone, unsigned int order, int migratetype) @@ -777,24 +795,48 @@ static inline void add_to_free_list(struct page *page, struct zone *zone, static inline void add_to_free_list_tail(struct page *page, struct zone *zone, unsigned int order, int migratetype) { - struct free_area *area = &zone->free_area[order]; + struct list_head *tail = get_unreported_tail(zone, order, migratetype); - list_add_tail(&page->lru, &area->free_list[migratetype]); - area->nr_free++; + /* + * To prevent the unreported pages from being interleaved with the + * reported ones while we are actively processing pages we will use + * the head of the reported pages to determine the tail of the free + * list. + */ + list_add_tail(&page->lru, tail); + zone->free_area[order].nr_free++; } /* Used for pages which are on another list */ static inline void move_to_free_list(struct page *page, struct zone *zone, unsigned int order, int migratetype) { - struct free_area *area = &zone->free_area[order]; + struct list_head *tail = get_unreported_tail(zone, order, migratetype); + + /* + * We must get the tail for our target list before moving the page on + * the reported list as we will possibly be replacing the tail page of + * the list with our current page if it is reported. + */ + if (unlikely(PageReported(page))) + move_page_to_reported_list(page, zone, migratetype); - list_move(&page->lru, &area->free_list[migratetype]); + /* + * To prevent unreported pages from being mixed with the reported + * ones we add pages to the tail of the list. By doing this the function + * above can either label them as included in the reported list or not + * and the result will be consistent. + */ + list_move_tail(&page->lru, tail); } static inline void del_page_from_free_list(struct page *page, struct zone *zone, unsigned int order) { + /* remove page from reported list, and clear reported state */ + if (unlikely(PageReported(page))) + del_page_from_reported_list(page, zone); + list_del(&page->lru); __ClearPageBuddy(page); set_page_private(page, 0); diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index f91cb8898ff0..759a3b3956f2 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -163,6 +163,9 @@ enum pageflags { /* non-lru isolated movable page */ PG_isolated = PG_reclaim, + + /* Buddy pages. Used to track which pages have been reported */ + PG_reported = PG_uptodate, }; #ifndef __GENERATING_BOUNDS_H @@ -432,6 +435,14 @@ static inline bool set_hwpoison_free_buddy_page(struct page *page) #endif /* + * PageReported() is used to track reported free pages within the Buddy + * allocator. We can use the non-atomic version of the test and set + * operations as both should be shielded with the zone lock to prevent + * any possible races on the setting or clearing of the bit. + */ +__PAGEFLAG(Reported, reported, PF_NO_COMPOUND) + +/* * On an anonymous page mapped into a user virtual memory area, * page->mapping points to its anon_vma, not to a struct address_space; * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. diff --git a/include/linux/page_reporting.h b/include/linux/page_reporting.h new file mode 100644 index 000000000000..5d434a7f8e16 --- /dev/null +++ b/include/linux/page_reporting.h @@ -0,0 +1,177 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_PAGE_REPORTING_H +#define _LINUX_PAGE_REPORTING_H + +#include +#include +#include + +#if defined(CONFIG_HUGETLB_PAGE) && HUGETLB_PAGE_ORDER < MAX_ORDER +#define PAGE_REPORTING_MIN_ORDER HUGETLB_PAGE_ORDER +#else +#define PAGE_REPORTING_MIN_ORDER (MAX_ORDER - 1) +#endif +#define PAGE_REPORTING_HWM 32 + +#ifdef CONFIG_PAGE_REPORTING +struct page_reporting_dev_info { + /* function that alters pages to make them "reported" */ + void (*report)(struct page_reporting_dev_info *phdev, + unsigned int nents); + + /* scatterlist containing pages to be processed */ + struct scatterlist *sg; + + /* + * Upper limit on the number of pages that the react function + * expects to be placed into the batch list to be processed. + */ + unsigned long capacity; + + /* work struct for processing reports */ + struct delayed_work work; + + /* + * The number of zones requesting reporting, plus one additional if + * processing thread is active. + */ + atomic_t refcnt; +}; + +/* Boundary functions */ +struct list_head *__page_reporting_get_boundary(unsigned int order, + int migratetype); +void page_reporting_del_from_boundary(struct page *page, struct zone *zone); +void page_reporting_add_to_boundary(struct page *page, struct zone *zone, + int migratetype); +void page_reporting_move_to_boundary(struct page *page, struct zone *zone, + int migratetype); + +/* Reported page accessors, defined in page_alloc.c */ +struct page *get_unreported_page(struct zone *zone, unsigned int order, + int migratetype); +void free_reported_page(struct page *page, unsigned int order); + +/* Tear-down and bring-up for page reporting devices */ +void page_reporting_shutdown(struct page_reporting_dev_info *phdev); +int page_reporting_startup(struct page_reporting_dev_info *phdev); + +void __page_reporting_free_stats(struct zone *zone); +void __page_reporting_request(struct zone *zone); +#endif /* CONFIG_PAGE_REPORTING */ + +/* + * Method for obtaining the tail of the free list. Using this allows for + * tail insertions of unreported pages into the region that is currently + * being scanned so as to avoid interleaving reported and unreported pages. + */ +static inline struct list_head * +get_unreported_tail(struct zone *zone, unsigned int order, int migratetype) +{ +#ifdef CONFIG_PAGE_REPORTING + if (order >= PAGE_REPORTING_MIN_ORDER && + test_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags)) + return __page_reporting_get_boundary(order, migratetype); +#endif + return &zone->free_area[order].free_list[migratetype]; +} + +/* + * Functions for adding/removing pages from reported end of list. + * All of them expect the zone lock to be held to maintain + * consistency of the reported list as a subset of the free list. + */ +static inline void add_page_to_reported_list(struct page *page, + struct zone *zone, + int order, + int migratetype) +{ +#ifdef CONFIG_PAGE_REPORTING + /* flag page as reported */ + __SetPageReported(page); + + /* update areated page accounting */ + zone->reported_pages[order - PAGE_REPORTING_MIN_ORDER]++; + + /* update boundary of new migratetype and record it */ + page_reporting_add_to_boundary(page, zone, migratetype); +#endif +} + +static inline void del_page_from_reported_list(struct page *page, + struct zone *zone) +{ +#ifdef CONFIG_PAGE_REPORTING + /* push boundary back if we removed the upper boundary */ + if (test_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags)) + page_reporting_del_from_boundary(page, zone); + + /* page_private will contain the page order, so just use it directly */ + zone->reported_pages[page_private(page) - PAGE_REPORTING_MIN_ORDER]--; + + /* clear the flag so we can report on it when it returns */ + __ClearPageReported(page); +#endif +} + +static inline void move_page_to_reported_list(struct page *page, + struct zone *zone, + int migratetype) +{ +#ifdef CONFIG_PAGE_REPORTING + page_reporting_move_to_boundary(page, zone, migratetype); +#endif +} + +/* Free reported_pages and reset reported page tracking count to 0 */ +static inline void page_reporting_reset(struct zone *zone) +{ +#ifdef CONFIG_PAGE_REPORTING + if (zone->reported_pages) + __page_reporting_free_stats(zone); +#endif +} + +DECLARE_STATIC_KEY_FALSE(page_reporting_notify_enabled); + +/** + * page_reporting_notify_free - Free page notification to start page processing + * @zone: Pointer to current zone of last page processed + * @order: Order of last page added to zone + * + * This function is meant to act as a screener for __page_reporting_request + * which will determine if a give zone has crossed over the high-water mark + * that will justify us beginning page treatment. If we have crossed that + * threshold then it will start the process of pulling some pages and + * placing them in the batch list for treatment. + */ +static inline void page_reporting_notify_free(struct zone *zone, int order) +{ +#ifdef CONFIG_PAGE_REPORTING + unsigned long nr_reported; + + /* Called from hot path in __free_one_page() */ + if (!static_branch_unlikely(&page_reporting_notify_enabled)) + return; + + /* Limit notifications only to higher order pages */ + if (order < PAGE_REPORTING_MIN_ORDER) + return; + + /* Do not bother with tests if we have already requested reporting */ + if (test_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags)) + return; + + /* If reported_pages is not populated, assume 0 */ + nr_reported = zone->reported_pages ? + zone->reported_pages[order - PAGE_REPORTING_MIN_ORDER] : 0; + + /* Only request it if we have enough to begin the page reporting */ + if (zone->free_area[order].nr_free < nr_reported + PAGE_REPORTING_HWM) + return; + + /* This is slow, but should be called very rarely */ + __page_reporting_request(zone); +#endif +} +#endif /*_LINUX_PAGE_REPORTING_H */ diff --git a/mm/Kconfig b/mm/Kconfig index a5dae9a7eb51..be1a5db50df5 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -237,6 +237,11 @@ config COMPACTION linux-mm@kvack.org. # +# support for unused page reporting +config PAGE_REPORTING + bool + +# # support for page migration # config MIGRATION diff --git a/mm/Makefile b/mm/Makefile index d11de59e9c3c..4dcf09cd8280 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -104,3 +104,4 @@ obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o obj-$(CONFIG_ZONE_DEVICE) += memremap.o obj-$(CONFIG_HMM_MIRROR) += hmm.o obj-$(CONFIG_MEMFD_CREATE) += memfd.o +obj-$(CONFIG_PAGE_REPORTING) += page_reporting.o diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 32a5386758ce..d0b813567ff4 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1614,6 +1614,7 @@ static int __ref __offline_pages(unsigned long start_pfn, if (!populated_zone(zone)) { zone_pcp_reset(zone); build_all_zonelists(NULL); + page_reporting_reset(zone); } else zone_pcp_update(zone); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index fd01031f733d..d3f19e09a507 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -68,6 +68,7 @@ #include #include #include +#include #include #include @@ -916,7 +917,7 @@ static inline struct capture_control *task_capc(struct zone *zone) static inline void __free_one_page(struct page *page, unsigned long pfn, struct zone *zone, unsigned int order, - int migratetype) + int migratetype, bool reported) { struct capture_control *capc = task_capc(zone); unsigned long uninitialized_var(buddy_pfn); @@ -991,11 +992,20 @@ static inline void __free_one_page(struct page *page, done_merging: set_page_order(page, order); - if (is_shuffle_order(order) ? shuffle_pick_tail() : - buddy_merge_likely(pfn, buddy_pfn, page, order)) + if (reported || + (is_shuffle_order(order) ? shuffle_pick_tail() : + buddy_merge_likely(pfn, buddy_pfn, page, order))) add_to_free_list_tail(page, zone, order, migratetype); else add_to_free_list(page, zone, order, migratetype); + + /* + * No need to notify on a reported page as the total count of + * unreported pages will not have increased since we have essentially + * merged the reported page with one or more unreported pages. + */ + if (!reported) + page_reporting_notify_free(zone, order); } /* @@ -1306,7 +1316,7 @@ static void free_pcppages_bulk(struct zone *zone, int count, if (unlikely(isolated_pageblocks)) mt = get_pageblock_migratetype(page); - __free_one_page(page, page_to_pfn(page), zone, 0, mt); + __free_one_page(page, page_to_pfn(page), zone, 0, mt, false); trace_mm_page_pcpu_drain(page, 0, mt); } spin_unlock(&zone->lock); @@ -1322,7 +1332,7 @@ static void free_one_page(struct zone *zone, is_migrate_isolate(migratetype))) { migratetype = get_pfnblock_migratetype(page, pfn); } - __free_one_page(page, pfn, zone, order, migratetype); + __free_one_page(page, pfn, zone, order, migratetype, false); spin_unlock(&zone->lock); } @@ -2184,6 +2194,100 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, return NULL; } +#ifdef CONFIG_PAGE_REPORTING +/** + * free_reported_page - Return a now-reported page back where we got it + * @page: Page that was reported + * + * This function will pull the migratetype and order information out + * of the page and attempt to return it where it found it. If the page + * is added to the free list without changes we will mark it as being + * reported. + */ +void free_reported_page(struct page *page, unsigned int order) +{ + struct zone *zone = page_zone(page); + unsigned long pfn; + unsigned int mt; + + /* zone lock should be held when this function is called */ + lockdep_assert_held(&zone->lock); + + pfn = page_to_pfn(page); + mt = get_pfnblock_migratetype(page, pfn); + __free_one_page(page, pfn, zone, order, mt, true); + + /* + * If page was not comingled with another page we can consider + * the result to be "reported" since part of the page hasn't been + * modified, otherwise we would need to report on the new larger + * page. + */ + if (PageBuddy(page) && page_order(page) == order) + add_page_to_reported_list(page, zone, order, mt); +} + +/** + * get_unreported_page - Pull an unreported page from the free_list + * @zone: Zone to draw pages from + * @order: Order to draw pages from + * @mt: Migratetype to draw pages from + * + * This function will obtain a page from the free list. It will start by + * attempting to pull from the tail of the free list and if that is already + * reported on it will instead pull the head if that is unreported. + * + * The page will have the migrate type and order stored in the page + * metadata. While being processed the page will not be avaialble for + * allocation. + * + * Return: page pointer if raw page found, otherwise NULL + */ +struct page *get_unreported_page(struct zone *zone, unsigned int order, int mt) +{ + struct list_head *tail = get_unreported_tail(zone, order, mt); + struct free_area *area = &(zone->free_area[order]); + struct list_head *list = &area->free_list[mt]; + struct page *page; + + /* zone lock should be held when this function is called */ + lockdep_assert_held(&zone->lock); + + /* Find a page of the appropriate size in the preferred list */ + page = list_last_entry(tail, struct page, lru); + list_for_each_entry_from_reverse(page, list, lru) { + /* If we entered this loop then the "raw" list isn't empty */ + + /* If the page is reported try the head of the list */ + if (PageReported(page)) { + page = list_first_entry(list, struct page, lru); + + /* + * If both the head and tail are reported then reset + * the boundary so that we read as an empty list + * next time and bail out. + */ + if (PageReported(page)) { + page_reporting_add_to_boundary(page, zone, mt); + break; + } + } + + del_page_from_free_list(page, zone, order); + + /* + * Page will not be available for allocation while we are + * processing it so update the freepage state. + */ + __mod_zone_freepage_state(zone, -(1 << order), mt); + + return page; + } + + return NULL; +} +#endif /* CONFIG_PAGE_REPORTING */ + /* * This array describes the order lists are fallen back to when * the free lists for the desirable migrate type are depleted diff --git a/mm/page_reporting.c b/mm/page_reporting.c new file mode 100644 index 000000000000..b6858592bcfa --- /dev/null +++ b/mm/page_reporting.c @@ -0,0 +1,336 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include "internal.h" + +static struct page_reporting_dev_info __rcu *ph_dev_info __read_mostly; + +struct list_head *boundary[MAX_ORDER - PAGE_REPORTING_MIN_ORDER][MIGRATE_TYPES]; + +static void page_reporting_reset_boundary(struct zone *zone, unsigned int order, + unsigned int migratetype) +{ + boundary[order - PAGE_REPORTING_MIN_ORDER][migratetype] = + &zone->free_area[order].free_list[migratetype]; +} + +#define for_each_reporting_migratetype_order(_order, _type) \ + for (_order = MAX_ORDER; _order-- != PAGE_REPORTING_MIN_ORDER;) \ + for (_type = MIGRATE_TYPES; _type--;) \ + if (!is_migrate_isolate(_type)) + +static int page_reporting_populate_metadata(struct zone *zone) +{ + unsigned int order, mt; + + /* + * We need to make sure we have somewhere to store the tracking + * data for how many reported pages are in the zone. To do that + * we need to make certain zone->reported_pages is populated. + */ + if (!zone->reported_pages) { + zone->reported_pages = + kcalloc(MAX_ORDER - PAGE_REPORTING_MIN_ORDER, + sizeof(unsigned long), + GFP_KERNEL); + if (!zone->reported_pages) + return -ENOMEM; + } + + /* Update boundary data to reflect the zone we are currently working */ + for_each_reporting_migratetype_order(order, mt) + page_reporting_reset_boundary(zone, order, mt); + + return 0; +} + +struct list_head *__page_reporting_get_boundary(unsigned int order, + int migratetype) +{ + return boundary[order - PAGE_REPORTING_MIN_ORDER][migratetype]; +} + +void page_reporting_del_from_boundary(struct page *page, struct zone *zone) +{ + unsigned int order = page_private(page) - PAGE_REPORTING_MIN_ORDER; + int mt = get_pcppage_migratetype(page); + struct list_head **tail = &boundary[order][mt]; + + if (*tail == &page->lru) + *tail = page->lru.next; +} + +void page_reporting_add_to_boundary(struct page *page, struct zone *zone, + int migratetype) +{ + unsigned int order = page_private(page) - PAGE_REPORTING_MIN_ORDER; + + boundary[order][migratetype] = &page->lru; + set_pcppage_migratetype(page, migratetype); +} + +void page_reporting_move_to_boundary(struct page *page, struct zone *zone, + int dest_mt) +{ + unsigned int order = page_private(page) - PAGE_REPORTING_MIN_ORDER; + + /* + * We essentially have two options available to us. The first is to + * move the page from the boundary list on one migratetype to the + * list for the new migratetype assuming reporting is still active. + * + * The other option is to clear the reported state of the page as + * we will not be adding it to the group of pages that were already + * reported. It is cheaper to just rereport such pages then go + * through and do a special search to skip over them. + */ + if (test_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags)) { + int src_mt = get_pcppage_migratetype(page); + struct list_head **tail = &boundary[order][src_mt]; + + if (*tail == &page->lru) + *tail = page->lru.next; + + boundary[order][dest_mt] = &page->lru; + set_pcppage_migratetype(page, dest_mt); + } else if (!is_migrate_isolate(dest_mt)) { + zone->reported_pages[order]--; + __ClearPageReported(page); + } +} + +static unsigned int page_reporting_fill(struct zone *zone, + struct page_reporting_dev_info *phdev) +{ + struct scatterlist *sg = phdev->sg; + unsigned int order, mt, count = 0; + + sg_init_table(phdev->sg, phdev->capacity); + + for_each_reporting_migratetype_order(order, mt) { + struct page *page; + + /* + * Pull pages from free list until we have drained + * it or we have reached capacity. + */ + while ((page = get_unreported_page(zone, order, mt))) { + sg_set_page(&sg[count], page, PAGE_SIZE << order, 0); + + if (++count == phdev->capacity) + return count; + } + } + + /* mark end of scatterlist due to underflow */ + if (count) + sg_mark_end(&sg[count - 1]); + + /* + * If there are no longer enough free pages to fully populate + * the scatterlist, then we can just shut it down for this zone. + */ + __clear_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags); + atomic_dec(&phdev->refcnt); + + return count; +} + +static void page_reporting_drain(struct page_reporting_dev_info *phdev) +{ + struct scatterlist *sg = phdev->sg; + + /* + * Drain the now reported pages back into their respective + * free lists/areas. We assume at least one page is populated. + */ + do { + free_reported_page(sg_page(sg), get_order(sg->length)); + } while (!sg_is_last(sg++)); +} + +/* + * The page reporting cycle consists of 4 stages, fill, report, drain, and idle. + * We will cycle through the first 3 stages until we fail to obtain any + * pages, in that case we will switch to idle. + */ +static void page_reporting_cycle(struct zone *zone, + struct page_reporting_dev_info *phdev) +{ + /* + * Guarantee boundaries and stats are populated before we + * start placing reported pages in the zone. + */ + if (page_reporting_populate_metadata(zone)) + return; + + spin_lock_irq(&zone->lock); + + /* set bit indicating boundaries are present */ + __set_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags); + + do { + /* Pull pages out of allocator into a scaterlist */ + unsigned int nents = page_reporting_fill(zone, phdev); + + /* no pages were acquired, give up */ + if (!nents) + break; + + spin_unlock_irq(&zone->lock); + + /* begin processing pages in local list */ + phdev->report(phdev, nents); + + spin_lock_irq(&zone->lock); + + /* + * We should have a scatterlist of pages that have been + * processed. Return them to their original free lists. + */ + page_reporting_drain(phdev); + + /* keep pulling pages till there are none to pull */ + } while (test_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags)); + + /* processing of the zone is complete, we can disable boundaries */ + __clear_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags); + + spin_unlock_irq(&zone->lock); +} + +static void page_reporting_process(struct work_struct *work) +{ + struct delayed_work *d_work = to_delayed_work(work); + struct page_reporting_dev_info *phdev = + container_of(d_work, struct page_reporting_dev_info, work); + struct zone *zone = first_online_pgdat()->node_zones; + + do { + if (test_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags)) + page_reporting_cycle(zone, phdev); + + /* Move to next zone, if at end of list start over */ + zone = next_zone(zone) ? : first_online_pgdat()->node_zones; + + /* + * As long as refcnt has not reached zero there are still + * zones to be processed. + */ + } while (atomic_read(&phdev->refcnt)); +} + +/* request page reporting on this zone */ +void __page_reporting_request(struct zone *zone) +{ + struct page_reporting_dev_info *phdev; + + rcu_read_lock(); + + /* + * We use RCU to protect the ph_dev_info pointer. In almost all + * cases this should be present, however in the unlikely case of + * a shutdown this will be NULL and we should exit. + */ + phdev = rcu_dereference(ph_dev_info); + if (unlikely(!phdev)) + return; + + /* + * We can use separate test and set operations here as there + * is nothing else that can set or clear this bit while we are + * holding the zone lock. The advantage to doing it this way is + * that we don't have to dirty the cacheline unless we are + * changing the value. + */ + __set_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags); + + /* + * Delay the start of work to allow a sizable queue to + * build. For now we are limiting this to running no more + * than 10 times per second. + */ + if (!atomic_fetch_inc(&phdev->refcnt)) + schedule_delayed_work(&phdev->work, HZ / 10); + + rcu_read_unlock(); +} + +void __page_reporting_free_stats(struct zone *zone) +{ + /* free reported_page statisitics */ + kfree(zone->reported_pages); + zone->reported_pages = NULL; +} + +static DEFINE_MUTEX(page_reporting_mutex); +DEFINE_STATIC_KEY_FALSE(page_reporting_notify_enabled); + +void page_reporting_shutdown(struct page_reporting_dev_info *phdev) +{ + mutex_lock(&page_reporting_mutex); + + if (rcu_access_pointer(ph_dev_info) == phdev) { + /* Disable page reporting notification */ + static_branch_disable(&page_reporting_notify_enabled); + RCU_INIT_POINTER(ph_dev_info, NULL); + synchronize_rcu(); + + /* Flush any existing work, and lock it out */ + cancel_delayed_work_sync(&phdev->work); + + /* Free scatterlist */ + kfree(phdev->sg); + phdev->sg = NULL; + } + + mutex_unlock(&page_reporting_mutex); +} +EXPORT_SYMBOL_GPL(page_reporting_shutdown); + +int page_reporting_startup(struct page_reporting_dev_info *phdev) +{ + struct zone *zone; + int err = 0; + + mutex_lock(&page_reporting_mutex); + + /* nothing to do if already in use */ + if (rcu_access_pointer(ph_dev_info)) { + err = -EBUSY; + goto err_out; + } + + /* allocate scatterlist to store pages being reported on */ + phdev->sg = kcalloc(phdev->capacity, sizeof(*phdev->sg), GFP_KERNEL); + if (!phdev->sg) { + err = -ENOMEM; + goto err_out; + } + + /* initialize refcnt and work structures */ + atomic_set(&phdev->refcnt, 0); + INIT_DELAYED_WORK(&phdev->work, &page_reporting_process); + + /* assign device, and begin initial flush of populated zones */ + rcu_assign_pointer(ph_dev_info, phdev); + for_each_populated_zone(zone) { + spin_lock_irq(&zone->lock); + __page_reporting_request(zone); + spin_unlock_irq(&zone->lock); + } + + /* enable page reporting notification */ + static_branch_enable(&page_reporting_notify_enabled); +err_out: + mutex_unlock(&page_reporting_mutex); + + return err; +} +EXPORT_SYMBOL_GPL(page_reporting_startup); From patchwork Wed Aug 21 14:59:56 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11107243 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 656A21399 for ; Wed, 21 Aug 2019 15:00:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2718D2339F for ; Wed, 21 Aug 2019 15:00:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="UBcsbaFs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2718D2339F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C14926B02D9; 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However we will need the page poisoning tracking logic as well for unused page reporting. As such pull it out and make it a separate bit of config in the probe function. In addition we can actually wrap the code in a check for NO_SANITY. If we don't care what is actually in the page we can just default to 0 and leave it there. Signed-off-by: Alexander Duyck --- drivers/virtio/virtio_balloon.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 226fbb995fb0..2c19457ab573 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -842,7 +842,6 @@ static int virtio_balloon_register_shrinker(struct virtio_balloon *vb) static int virtballoon_probe(struct virtio_device *vdev) { struct virtio_balloon *vb; - __u32 poison_val; int err; if (!vdev->config->get) { @@ -909,11 +908,19 @@ static int virtballoon_probe(struct virtio_device *vdev) VIRTIO_BALLOON_CMD_ID_STOP); spin_lock_init(&vb->free_page_list_lock); INIT_LIST_HEAD(&vb->free_page_list); - if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) { - memset(&poison_val, PAGE_POISON, sizeof(poison_val)); - virtio_cwrite(vb->vdev, struct virtio_balloon_config, - poison_val, &poison_val); - } + } + if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) { + __u32 poison_val = 0; + +#if !defined(CONFIG_PAGE_POISONING_NO_SANITY) + /* + * Let hypervisor know that we are expecting a specific + * value to be written back in unused pages. + */ + memset(&poison_val, PAGE_POISON, sizeof(poison_val)); +#endif + virtio_cwrite(vb->vdev, struct virtio_balloon_config, + poison_val, &poison_val); } /* * We continue to use VIRTIO_BALLOON_F_DEFLATE_ON_OOM to decide if a From patchwork Wed Aug 21 15:00:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11107247 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AE6201399 for ; Wed, 21 Aug 2019 15:00:09 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5FD5722DD3 for ; Wed, 21 Aug 2019 15:00:09 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Reporting differs from the regular balloon functionality in that is is much less durable than a standard memory balloon. Instead of creating a list of pages that cannot be accessed the pages are only inaccessible while they are being indicated to the virtio interface. Once the interface has acknowledged them they are placed back into their respective free lists and are once again accessible by the guest system. Signed-off-by: Alexander Duyck --- drivers/virtio/Kconfig | 1 + drivers/virtio/virtio_balloon.c | 65 +++++++++++++++++++++++++++++++++++ include/uapi/linux/virtio_balloon.h | 1 + 3 files changed, 67 insertions(+) diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index 078615cf2afc..4b2dd8259ff5 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -58,6 +58,7 @@ config VIRTIO_BALLOON tristate "Virtio balloon driver" depends on VIRTIO select MEMORY_BALLOON + select PAGE_REPORTING ---help--- This driver supports increasing and decreasing the amount of memory within a KVM guest. diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 2c19457ab573..52f9eeda1877 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -19,6 +19,7 @@ #include #include #include +#include /* * Balloon device works in 4K page units. So each page is pointed to by @@ -37,6 +38,9 @@ #define VIRTIO_BALLOON_FREE_PAGE_SIZE \ (1 << (VIRTIO_BALLOON_FREE_PAGE_ORDER + PAGE_SHIFT)) +/* limit on the number of pages that can be on the reporting vq */ +#define VIRTIO_BALLOON_VRING_HINTS_MAX 16 + #ifdef CONFIG_BALLOON_COMPACTION static struct vfsmount *balloon_mnt; #endif @@ -46,6 +50,7 @@ enum virtio_balloon_vq { VIRTIO_BALLOON_VQ_DEFLATE, VIRTIO_BALLOON_VQ_STATS, VIRTIO_BALLOON_VQ_FREE_PAGE, + VIRTIO_BALLOON_VQ_REPORTING, VIRTIO_BALLOON_VQ_MAX }; @@ -113,6 +118,10 @@ struct virtio_balloon { /* To register a shrinker to shrink memory upon memory pressure */ struct shrinker shrinker; + + /* Unused page reporting device */ + struct virtqueue *reporting_vq; + struct page_reporting_dev_info ph_dev_info; }; static struct virtio_device_id id_table[] = { @@ -152,6 +161,32 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq) } +void virtballoon_unused_page_report(struct page_reporting_dev_info *ph_dev_info, + unsigned int nents) +{ + struct virtio_balloon *vb = + container_of(ph_dev_info, struct virtio_balloon, ph_dev_info); + struct virtqueue *vq = vb->reporting_vq; + unsigned int unused, err; + + /* We should always be able to add these buffers to an empty queue. */ + err = virtqueue_add_inbuf(vq, ph_dev_info->sg, nents, vb, + GFP_NOWAIT | __GFP_NOWARN); + + /* + * In the extremely unlikely case that something has changed and we + * are able to trigger an error we will simply display a warning + * and exit without actually processing the pages. + */ + if (WARN_ON(err)) + return; + + virtqueue_kick(vq); + + /* When host has read buffer, this completes via balloon_ack */ + wait_event(vb->acked, virtqueue_get_buf(vq, &unused)); +} + static void set_page_pfns(struct virtio_balloon *vb, __virtio32 pfns[], struct page *page) { @@ -476,6 +511,7 @@ static int init_vqs(struct virtio_balloon *vb) names[VIRTIO_BALLOON_VQ_DEFLATE] = "deflate"; names[VIRTIO_BALLOON_VQ_STATS] = NULL; names[VIRTIO_BALLOON_VQ_FREE_PAGE] = NULL; + names[VIRTIO_BALLOON_VQ_REPORTING] = NULL; if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { names[VIRTIO_BALLOON_VQ_STATS] = "stats"; @@ -487,11 +523,19 @@ static int init_vqs(struct virtio_balloon *vb) callbacks[VIRTIO_BALLOON_VQ_FREE_PAGE] = NULL; } + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { + names[VIRTIO_BALLOON_VQ_REPORTING] = "reporting_vq"; + callbacks[VIRTIO_BALLOON_VQ_REPORTING] = balloon_ack; + } + err = vb->vdev->config->find_vqs(vb->vdev, VIRTIO_BALLOON_VQ_MAX, vqs, callbacks, names, NULL, NULL); if (err) return err; + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) + vb->reporting_vq = vqs[VIRTIO_BALLOON_VQ_REPORTING]; + vb->inflate_vq = vqs[VIRTIO_BALLOON_VQ_INFLATE]; vb->deflate_vq = vqs[VIRTIO_BALLOON_VQ_DEFLATE]; if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { @@ -931,12 +975,30 @@ static int virtballoon_probe(struct virtio_device *vdev) if (err) goto out_del_balloon_wq; } + + vb->ph_dev_info.report = virtballoon_unused_page_report; + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { + unsigned int capacity; + + capacity = min_t(unsigned int, + virtqueue_get_vring_size(vb->reporting_vq) - 1, + VIRTIO_BALLOON_VRING_HINTS_MAX); + vb->ph_dev_info.capacity = capacity; + + err = page_reporting_startup(&vb->ph_dev_info); + if (err) + goto out_unregister_shrinker; + } + virtio_device_ready(vdev); if (towards_target(vb)) virtballoon_changed(vdev); return 0; +out_unregister_shrinker: + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) + virtio_balloon_unregister_shrinker(vb); out_del_balloon_wq: if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) destroy_workqueue(vb->balloon_wq); @@ -965,6 +1027,8 @@ static void virtballoon_remove(struct virtio_device *vdev) { struct virtio_balloon *vb = vdev->priv; + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) + page_reporting_shutdown(&vb->ph_dev_info); if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) virtio_balloon_unregister_shrinker(vb); spin_lock_irq(&vb->stop_update_lock); @@ -1034,6 +1098,7 @@ static int virtballoon_validate(struct virtio_device *vdev) VIRTIO_BALLOON_F_DEFLATE_ON_OOM, VIRTIO_BALLOON_F_FREE_PAGE_HINT, VIRTIO_BALLOON_F_PAGE_POISON, + VIRTIO_BALLOON_F_REPORTING, }; static struct virtio_driver virtio_balloon_driver = { diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h index a1966cd7b677..19974392d324 100644 --- a/include/uapi/linux/virtio_balloon.h +++ b/include/uapi/linux/virtio_balloon.h @@ -36,6 +36,7 @@ #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */ #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */ +#define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12