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Tue, 17 Mar 2020 20:33:33 -0700 (PDT) Received: from localhost.localdomain ([114.206.198.176]) by smtp.gmail.com with ESMTPSA id ep7sm679641pjb.24.2020.03.17.20.33.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 17 Mar 2020 20:33:33 -0700 (PDT) From: js1304@gmail.com X-Google-Original-From: iamjoonsoo.kim@lge.com To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner , Michal Hocko , Minchan Kim , Vlastimil Babka , Mel Gorman , kernel-team@lge.com, Ye Xiaolong , Joonsoo Kim Subject: [PATCH v2 2/2] mm/page_alloc: integrate classzone_idx and high_zoneidx Date: Wed, 18 Mar 2020 12:32:58 +0900 Message-Id: <1584502378-12609-3-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1584502378-12609-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1584502378-12609-1-git-send-email-iamjoonsoo.kim@lge.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Joonsoo Kim classzone_idx is just different name for high_zoneidx now. So, integrate them and add some comment to struct alloc_context in order to reduce future confusion about the meaning of this variable. In addition to integration, this patch also renames high_zoneidx to highest_zoneidx since it represents more precise meaning. Signed-off-by: Joonsoo Kim --- include/linux/compaction.h | 9 ++-- include/linux/mmzone.h | 12 ++--- include/trace/events/compaction.h | 22 ++++---- include/trace/events/vmscan.h | 14 +++-- mm/compaction.c | 64 +++++++++++------------ mm/internal.h | 10 ++-- mm/memory_hotplug.c | 6 +-- mm/oom_kill.c | 4 +- mm/page_alloc.c | 60 +++++++++++----------- mm/slab.c | 4 +- mm/slub.c | 4 +- mm/vmscan.c | 105 ++++++++++++++++++++------------------ 12 files changed, 165 insertions(+), 149 deletions(-) diff --git a/include/linux/compaction.h b/include/linux/compaction.h index 4b898cd..3ed2f22 100644 --- a/include/linux/compaction.h +++ b/include/linux/compaction.h @@ -97,7 +97,7 @@ extern enum compact_result try_to_compact_pages(gfp_t gfp_mask, struct page **page); extern void reset_isolation_suitable(pg_data_t *pgdat); extern enum compact_result compaction_suitable(struct zone *zone, int order, - unsigned int alloc_flags, int classzone_idx); + unsigned int alloc_flags, int highest_zoneidx); extern void defer_compaction(struct zone *zone, int order); extern bool compaction_deferred(struct zone *zone, int order); @@ -182,7 +182,7 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order, extern int kcompactd_run(int nid); extern void kcompactd_stop(int nid); -extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx); +extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int highest_zoneidx); #else static inline void reset_isolation_suitable(pg_data_t *pgdat) @@ -190,7 +190,7 @@ static inline void reset_isolation_suitable(pg_data_t *pgdat) } static inline enum compact_result compaction_suitable(struct zone *zone, int order, - int alloc_flags, int classzone_idx) + int alloc_flags, int highest_zoneidx) { return COMPACT_SKIPPED; } @@ -232,7 +232,8 @@ static inline void kcompactd_stop(int nid) { } -static inline void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx) +static inline void wakeup_kcompactd(pg_data_t *pgdat, + int order, int highest_zoneidx) { } diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index f3f2648..337b5ec 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -698,13 +698,13 @@ typedef struct pglist_data { struct task_struct *kswapd; /* Protected by mem_hotplug_begin/end() */ int kswapd_order; - enum zone_type kswapd_classzone_idx; + enum zone_type kswapd_highest_zoneidx; int kswapd_failures; /* Number of 'reclaimed == 0' runs */ #ifdef CONFIG_COMPACTION int kcompactd_max_order; - enum zone_type kcompactd_classzone_idx; + enum zone_type kcompactd_highest_zoneidx; wait_queue_head_t kcompactd_wait; struct task_struct *kcompactd; #endif @@ -782,15 +782,15 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat) void build_all_zonelists(pg_data_t *pgdat); void wakeup_kswapd(struct zone *zone, gfp_t gfp_mask, int order, - enum zone_type classzone_idx); + enum zone_type highest_zoneidx); bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, - int classzone_idx, unsigned int alloc_flags, + int highest_zoneidx, unsigned int alloc_flags, long free_pages); bool zone_watermark_ok(struct zone *z, unsigned int order, - unsigned long mark, int classzone_idx, + unsigned long mark, int highest_zoneidx, unsigned int alloc_flags); bool zone_watermark_ok_safe(struct zone *z, unsigned int order, - unsigned long mark, int classzone_idx); + unsigned long mark, int highest_zoneidx); enum memmap_context { MEMMAP_EARLY, MEMMAP_HOTPLUG, diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h index e5bf6ee..54e5bf0 100644 --- a/include/trace/events/compaction.h +++ b/include/trace/events/compaction.h @@ -314,40 +314,44 @@ TRACE_EVENT(mm_compaction_kcompactd_sleep, DECLARE_EVENT_CLASS(kcompactd_wake_template, - TP_PROTO(int nid, int order, enum zone_type classzone_idx), + TP_PROTO(int nid, int order, enum zone_type highest_zoneidx), - TP_ARGS(nid, order, classzone_idx), + TP_ARGS(nid, order, highest_zoneidx), TP_STRUCT__entry( __field(int, nid) __field(int, order) - __field(enum zone_type, classzone_idx) + __field(enum zone_type, highest_zoneidx) ), TP_fast_assign( __entry->nid = nid; __entry->order = order; - __entry->classzone_idx = classzone_idx; + __entry->highest_zoneidx = highest_zoneidx; ), + /* + * classzone_idx is previous name of the highest_zoneidx. + * Reason not to change it is the ABI requirement of the tracepoint. + */ TP_printk("nid=%d order=%d classzone_idx=%-8s", __entry->nid, __entry->order, - __print_symbolic(__entry->classzone_idx, ZONE_TYPE)) + __print_symbolic(__entry->highest_zoneidx, ZONE_TYPE)) ); DEFINE_EVENT(kcompactd_wake_template, mm_compaction_wakeup_kcompactd, - TP_PROTO(int nid, int order, enum zone_type classzone_idx), + TP_PROTO(int nid, int order, enum zone_type highest_zoneidx), - TP_ARGS(nid, order, classzone_idx) + TP_ARGS(nid, order, highest_zoneidx) ); DEFINE_EVENT(kcompactd_wake_template, mm_compaction_kcompactd_wake, - TP_PROTO(int nid, int order, enum zone_type classzone_idx), + TP_PROTO(int nid, int order, enum zone_type highest_zoneidx), - TP_ARGS(nid, order, classzone_idx) + TP_ARGS(nid, order, highest_zoneidx) ); #endif diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index a5ab297..f2b3b9c 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -265,7 +265,7 @@ TRACE_EVENT(mm_shrink_slab_end, ); TRACE_EVENT(mm_vmscan_lru_isolate, - TP_PROTO(int classzone_idx, + TP_PROTO(int highest_zoneidx, int order, unsigned long nr_requested, unsigned long nr_scanned, @@ -274,10 +274,10 @@ TRACE_EVENT(mm_vmscan_lru_isolate, isolate_mode_t isolate_mode, int lru), - TP_ARGS(classzone_idx, order, nr_requested, nr_scanned, nr_skipped, nr_taken, isolate_mode, lru), + TP_ARGS(highest_zoneidx, order, nr_requested, nr_scanned, nr_skipped, nr_taken, isolate_mode, lru), TP_STRUCT__entry( - __field(int, classzone_idx) + __field(int, highest_zoneidx) __field(int, order) __field(unsigned long, nr_requested) __field(unsigned long, nr_scanned) @@ -288,7 +288,7 @@ TRACE_EVENT(mm_vmscan_lru_isolate, ), TP_fast_assign( - __entry->classzone_idx = classzone_idx; + __entry->highest_zoneidx = highest_zoneidx; __entry->order = order; __entry->nr_requested = nr_requested; __entry->nr_scanned = nr_scanned; @@ -298,9 +298,13 @@ TRACE_EVENT(mm_vmscan_lru_isolate, __entry->lru = lru; ), + /* + * classzone is previous name of the highest_zoneidx. + * Reason not to change it is the ABI requirement of the tracepoint. + */ TP_printk("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s", __entry->isolate_mode, - __entry->classzone_idx, + __entry->highest_zoneidx, __entry->order, __entry->nr_requested, __entry->nr_scanned, diff --git a/mm/compaction.c b/mm/compaction.c index 827d8a2..d72113f 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1966,7 +1966,7 @@ static enum compact_result compact_finished(struct compact_control *cc) */ static enum compact_result __compaction_suitable(struct zone *zone, int order, unsigned int alloc_flags, - int classzone_idx, + int highest_zoneidx, unsigned long wmark_target) { unsigned long watermark; @@ -1979,7 +1979,7 @@ static enum compact_result __compaction_suitable(struct zone *zone, int order, * If watermarks for high-order allocation are already met, there * should be no need for compaction at all. */ - if (zone_watermark_ok(zone, order, watermark, classzone_idx, + if (zone_watermark_ok(zone, order, watermark, highest_zoneidx, alloc_flags)) return COMPACT_SUCCESS; @@ -1989,9 +1989,9 @@ static enum compact_result __compaction_suitable(struct zone *zone, int order, * watermark and alloc_flags have to match, or be more pessimistic than * the check in __isolate_free_page(). We don't use the direct * compactor's alloc_flags, as they are not relevant for freepage - * isolation. We however do use the direct compactor's classzone_idx to - * skip over zones where lowmem reserves would prevent allocation even - * if compaction succeeds. + * isolation. We however do use the direct compactor's highest_zoneidx + * to skip over zones where lowmem reserves would prevent allocation + * even if compaction succeeds. * For costly orders, we require low watermark instead of min for * compaction to proceed to increase its chances. * ALLOC_CMA is used, as pages in CMA pageblocks are considered @@ -2000,7 +2000,7 @@ static enum compact_result __compaction_suitable(struct zone *zone, int order, watermark = (order > PAGE_ALLOC_COSTLY_ORDER) ? low_wmark_pages(zone) : min_wmark_pages(zone); watermark += compact_gap(order); - if (!__zone_watermark_ok(zone, 0, watermark, classzone_idx, + if (!__zone_watermark_ok(zone, 0, watermark, highest_zoneidx, ALLOC_CMA, wmark_target)) return COMPACT_SKIPPED; @@ -2009,12 +2009,12 @@ static enum compact_result __compaction_suitable(struct zone *zone, int order, enum compact_result compaction_suitable(struct zone *zone, int order, unsigned int alloc_flags, - int classzone_idx) + int highest_zoneidx) { enum compact_result ret; int fragindex; - ret = __compaction_suitable(zone, order, alloc_flags, classzone_idx, + ret = __compaction_suitable(zone, order, alloc_flags, highest_zoneidx, zone_page_state(zone, NR_FREE_PAGES)); /* * fragmentation index determines if allocation failures are due to @@ -2055,8 +2055,8 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order, * Make sure at least one zone would pass __compaction_suitable if we continue * retrying the reclaim. */ - for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, - ac->nodemask) { + for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, + ac->highest_zoneidx, ac->nodemask) { unsigned long available; enum compact_result compact_result; @@ -2069,7 +2069,7 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order, available = zone_reclaimable_pages(zone) / order; available += zone_page_state_snapshot(zone, NR_FREE_PAGES); compact_result = __compaction_suitable(zone, order, alloc_flags, - ac_classzone_idx(ac), available); + ac_highest_zoneidx(ac), available); if (compact_result != COMPACT_SKIPPED) return true; } @@ -2100,7 +2100,7 @@ compact_zone(struct compact_control *cc, struct capture_control *capc) cc->migratetype = gfpflags_to_migratetype(cc->gfp_mask); ret = compaction_suitable(cc->zone, cc->order, cc->alloc_flags, - cc->classzone_idx); + cc->highest_zoneidx); /* Compaction is likely to fail */ if (ret == COMPACT_SUCCESS || ret == COMPACT_SKIPPED) return ret; @@ -2296,7 +2296,7 @@ compact_zone(struct compact_control *cc, struct capture_control *capc) static enum compact_result compact_zone_order(struct zone *zone, int order, gfp_t gfp_mask, enum compact_priority prio, - unsigned int alloc_flags, int classzone_idx, + unsigned int alloc_flags, int highest_zoneidx, struct page **capture) { enum compact_result ret; @@ -2308,7 +2308,7 @@ static enum compact_result compact_zone_order(struct zone *zone, int order, .mode = (prio == COMPACT_PRIO_ASYNC) ? MIGRATE_ASYNC : MIGRATE_SYNC_LIGHT, .alloc_flags = alloc_flags, - .classzone_idx = classzone_idx, + .highest_zoneidx = highest_zoneidx, .direct_compaction = true, .whole_zone = (prio == MIN_COMPACT_PRIORITY), .ignore_skip_hint = (prio == MIN_COMPACT_PRIORITY), @@ -2364,8 +2364,8 @@ enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order, trace_mm_compaction_try_to_compact_pages(order, gfp_mask, prio); /* Compact each zone in the list */ - for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, - ac->nodemask) { + for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, + ac->highest_zoneidx, ac->nodemask) { enum compact_result status; if (prio > MIN_COMPACT_PRIORITY @@ -2375,7 +2375,7 @@ enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order, } status = compact_zone_order(zone, order, gfp_mask, prio, - alloc_flags, ac_classzone_idx(ac), capture); + alloc_flags, ac_highest_zoneidx(ac), capture); rc = max(status, rc); /* The allocation should succeed, stop compacting */ @@ -2510,16 +2510,16 @@ static bool kcompactd_node_suitable(pg_data_t *pgdat) { int zoneid; struct zone *zone; - enum zone_type classzone_idx = pgdat->kcompactd_classzone_idx; + enum zone_type highest_zoneidx = pgdat->kcompactd_highest_zoneidx; - for (zoneid = 0; zoneid <= classzone_idx; zoneid++) { + for (zoneid = 0; zoneid <= highest_zoneidx; zoneid++) { zone = &pgdat->node_zones[zoneid]; if (!populated_zone(zone)) continue; if (compaction_suitable(zone, pgdat->kcompactd_max_order, 0, - classzone_idx) == COMPACT_CONTINUE) + highest_zoneidx) == COMPACT_CONTINUE) return true; } @@ -2537,16 +2537,16 @@ static void kcompactd_do_work(pg_data_t *pgdat) struct compact_control cc = { .order = pgdat->kcompactd_max_order, .search_order = pgdat->kcompactd_max_order, - .classzone_idx = pgdat->kcompactd_classzone_idx, + .highest_zoneidx = pgdat->kcompactd_highest_zoneidx, .mode = MIGRATE_SYNC_LIGHT, .ignore_skip_hint = false, .gfp_mask = GFP_KERNEL, }; trace_mm_compaction_kcompactd_wake(pgdat->node_id, cc.order, - cc.classzone_idx); + cc.highest_zoneidx); count_compact_event(KCOMPACTD_WAKE); - for (zoneid = 0; zoneid <= cc.classzone_idx; zoneid++) { + for (zoneid = 0; zoneid <= cc.highest_zoneidx; zoneid++) { int status; zone = &pgdat->node_zones[zoneid]; @@ -2595,16 +2595,16 @@ static void kcompactd_do_work(pg_data_t *pgdat) /* * Regardless of success, we are done until woken up next. But remember - * the requested order/classzone_idx in case it was higher/tighter than - * our current ones + * the requested order/highest_zoneidx in case it was higher/tighter + * than our current ones */ if (pgdat->kcompactd_max_order <= cc.order) pgdat->kcompactd_max_order = 0; - if (pgdat->kcompactd_classzone_idx >= cc.classzone_idx) - pgdat->kcompactd_classzone_idx = pgdat->nr_zones - 1; + if (pgdat->kcompactd_highest_zoneidx >= cc.highest_zoneidx) + pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1; } -void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx) +void wakeup_kcompactd(pg_data_t *pgdat, int order, int highest_zoneidx) { if (!order) return; @@ -2612,8 +2612,8 @@ void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx) if (pgdat->kcompactd_max_order < order) pgdat->kcompactd_max_order = order; - if (pgdat->kcompactd_classzone_idx > classzone_idx) - pgdat->kcompactd_classzone_idx = classzone_idx; + if (pgdat->kcompactd_highest_zoneidx > highest_zoneidx) + pgdat->kcompactd_highest_zoneidx = highest_zoneidx; /* * Pairs with implicit barrier in wait_event_freezable() @@ -2626,7 +2626,7 @@ void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx) return; trace_mm_compaction_wakeup_kcompactd(pgdat->node_id, order, - classzone_idx); + highest_zoneidx); wake_up_interruptible(&pgdat->kcompactd_wait); } @@ -2647,7 +2647,7 @@ static int kcompactd(void *p) set_freezable(); pgdat->kcompactd_max_order = 0; - pgdat->kcompactd_classzone_idx = pgdat->nr_zones - 1; + pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1; while (!kthread_should_stop()) { unsigned long pflags; diff --git a/mm/internal.h b/mm/internal.h index aebaa33..7921150 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -102,10 +102,10 @@ extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); * between functions involved in allocations, including the alloc_pages* * family of functions. * - * nodemask, migratetype and high_zoneidx are initialized only once in + * nodemask, migratetype and highest_zoneidx are initialized only once in * __alloc_pages_nodemask() and then never change. * - * zonelist, preferred_zone and classzone_idx are set first in + * zonelist, preferred_zone and highest_zoneidx are set first in * __alloc_pages_nodemask() for the fast path, and might be later changed * in __alloc_pages_slowpath(). All other functions pass the whole strucure * by a const pointer. @@ -115,11 +115,11 @@ struct alloc_context { nodemask_t *nodemask; struct zoneref *preferred_zoneref; int migratetype; - enum zone_type high_zoneidx; + enum zone_type highest_zoneidx; bool spread_dirty_pages; }; -#define ac_classzone_idx(ac) (ac->high_zoneidx) +#define ac_highest_zoneidx(ac) (ac->highest_zoneidx) /* * Locate the struct page for both the matching buddy in our @@ -199,7 +199,7 @@ struct compact_control { int order; /* order a direct compactor needs */ int migratetype; /* migratetype of direct compactor */ const unsigned int alloc_flags; /* alloc flags of a direct compactor */ - const int classzone_idx; /* zone index of a direct compactor */ + const int highest_zoneidx; /* zone index of a direct compactor */ enum migrate_mode mode; /* Async or sync migration mode */ bool ignore_skip_hint; /* Scan blocks even if marked skip */ bool no_set_skip_hint; /* Don't mark blocks for skipping */ diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8bdf484..f942969 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -880,13 +880,13 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) } else { int cpu; /* - * Reset the nr_zones, order and classzone_idx before reuse. - * Note that kswapd will init kswapd_classzone_idx properly + * Reset the nr_zones, order and highest_zoneidx before reuse. + * Note that kswapd will init kswapd_highest_zoneidx properly * when it starts in the near future. */ pgdat->nr_zones = 0; pgdat->kswapd_order = 0; - pgdat->kswapd_classzone_idx = 0; + pgdat->kswapd_highest_zoneidx = 0; for_each_online_cpu(cpu) { struct per_cpu_nodestat *p; diff --git a/mm/oom_kill.c b/mm/oom_kill.c index dfc3576..4daedf7 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -254,7 +254,7 @@ static enum oom_constraint constrained_alloc(struct oom_control *oc) { struct zone *zone; struct zoneref *z; - enum zone_type high_zoneidx = gfp_zone(oc->gfp_mask); + enum zone_type highest_zoneidx = gfp_zone(oc->gfp_mask); bool cpuset_limited = false; int nid; @@ -294,7 +294,7 @@ static enum oom_constraint constrained_alloc(struct oom_control *oc) /* Check this allocation failure is caused by cpuset's wall function */ for_each_zone_zonelist_nodemask(zone, z, oc->zonelist, - high_zoneidx, oc->nodemask) + highest_zoneidx, oc->nodemask) if (!cpuset_zone_allowed(zone, oc->gfp_mask)) cpuset_limited = true; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index cb2f896..7c2a05e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2620,7 +2620,7 @@ static bool unreserve_highatomic_pageblock(const struct alloc_context *ac, int order; bool ret; - for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->high_zoneidx, + for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->highest_zoneidx, ac->nodemask) { /* * Preserve at least one pageblock unless memory pressure @@ -3488,7 +3488,7 @@ ALLOW_ERROR_INJECTION(should_fail_alloc_page, TRUE); * to check in the allocation paths if no pages are free. */ bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, - int classzone_idx, unsigned int alloc_flags, + int highest_zoneidx, unsigned int alloc_flags, long free_pages) { long min = mark; @@ -3533,7 +3533,7 @@ bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, * are not met, then a high-order request also cannot go ahead * even if a suitable page happened to be free. */ - if (free_pages <= min + z->lowmem_reserve[classzone_idx]) + if (free_pages <= min + z->lowmem_reserve[highest_zoneidx]) return false; /* If this is an order-0 request then the watermark is fine */ @@ -3566,14 +3566,15 @@ bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, } bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, - int classzone_idx, unsigned int alloc_flags) + int highest_zoneidx, unsigned int alloc_flags) { - return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, + return __zone_watermark_ok(z, order, mark, highest_zoneidx, alloc_flags, zone_page_state(z, NR_FREE_PAGES)); } static inline bool zone_watermark_fast(struct zone *z, unsigned int order, - unsigned long mark, int classzone_idx, unsigned int alloc_flags) + unsigned long mark, int highest_zoneidx, + unsigned int alloc_flags) { long free_pages = zone_page_state(z, NR_FREE_PAGES); long cma_pages = 0; @@ -3591,22 +3592,23 @@ static inline bool zone_watermark_fast(struct zone *z, unsigned int order, * the caller is !atomic then it'll uselessly search the free * list. That corner case is then slower but it is harmless. */ - if (!order && (free_pages - cma_pages) > mark + z->lowmem_reserve[classzone_idx]) + if (!order && (free_pages - cma_pages) > + mark + z->lowmem_reserve[highest_zoneidx]) return true; - return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, + return __zone_watermark_ok(z, order, mark, highest_zoneidx, alloc_flags, free_pages); } bool zone_watermark_ok_safe(struct zone *z, unsigned int order, - unsigned long mark, int classzone_idx) + unsigned long mark, int highest_zoneidx) { long free_pages = zone_page_state(z, NR_FREE_PAGES); if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); - return __zone_watermark_ok(z, order, mark, classzone_idx, 0, + return __zone_watermark_ok(z, order, mark, highest_zoneidx, 0, free_pages); } @@ -3683,8 +3685,8 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, */ no_fallback = alloc_flags & ALLOC_NOFRAGMENT; z = ac->preferred_zoneref; - for_next_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, - ac->nodemask) { + for_next_zone_zonelist_nodemask(zone, z, ac->zonelist, + ac->highest_zoneidx, ac->nodemask) { struct page *page; unsigned long mark; @@ -3739,7 +3741,7 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, mark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK); if (!zone_watermark_fast(zone, order, mark, - ac_classzone_idx(ac), alloc_flags)) { + ac_highest_zoneidx(ac), alloc_flags)) { int ret; #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT @@ -3772,7 +3774,7 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, default: /* did we reclaim enough */ if (zone_watermark_ok(zone, order, mark, - ac_classzone_idx(ac), alloc_flags)) + ac_highest_zoneidx(ac), alloc_flags)) goto try_this_zone; continue; @@ -3931,7 +3933,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, if (gfp_mask & __GFP_RETRY_MAYFAIL) goto out; /* The OOM killer does not needlessly kill tasks for lowmem */ - if (ac->high_zoneidx < ZONE_NORMAL) + if (ac->highest_zoneidx < ZONE_NORMAL) goto out; if (pm_suspended_storage()) goto out; @@ -4134,10 +4136,10 @@ should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_fla * Let's give them a good hope and keep retrying while the order-0 * watermarks are OK. */ - for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, - ac->nodemask) { + for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, + ac->highest_zoneidx, ac->nodemask) { if (zone_watermark_ok(zone, 0, min_wmark_pages(zone), - ac_classzone_idx(ac), alloc_flags)) + ac_highest_zoneidx(ac), alloc_flags)) return true; } return false; @@ -4261,12 +4263,12 @@ static void wake_all_kswapds(unsigned int order, gfp_t gfp_mask, struct zoneref *z; struct zone *zone; pg_data_t *last_pgdat = NULL; - enum zone_type high_zoneidx = ac->high_zoneidx; + enum zone_type highest_zoneidx = ac->highest_zoneidx; - for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, high_zoneidx, + for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, highest_zoneidx, ac->nodemask) { if (last_pgdat != zone->zone_pgdat) - wakeup_kswapd(zone, gfp_mask, order, high_zoneidx); + wakeup_kswapd(zone, gfp_mask, order, highest_zoneidx); last_pgdat = zone->zone_pgdat; } } @@ -4401,8 +4403,8 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order, * request even if all reclaimable pages are considered then we are * screwed and have to go OOM. */ - for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, - ac->nodemask) { + for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, + ac->highest_zoneidx, ac->nodemask) { unsigned long available; unsigned long reclaimable; unsigned long min_wmark = min_wmark_pages(zone); @@ -4416,7 +4418,7 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order, * reclaimable pages? */ wmark = __zone_watermark_ok(zone, order, min_wmark, - ac_classzone_idx(ac), alloc_flags, available); + ac_highest_zoneidx(ac), alloc_flags, available); trace_reclaim_retry_zone(z, order, reclaimable, available, min_wmark, *no_progress_loops, wmark); if (wmark) { @@ -4535,7 +4537,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, * could end up iterating over non-eligible zones endlessly. */ ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, - ac->high_zoneidx, ac->nodemask); + ac->highest_zoneidx, ac->nodemask); if (!ac->preferred_zoneref->zone) goto nopage; @@ -4622,7 +4624,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, if (!(alloc_flags & ALLOC_CPUSET) || reserve_flags) { ac->nodemask = NULL; ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, - ac->high_zoneidx, ac->nodemask); + ac->highest_zoneidx, ac->nodemask); } /* Attempt with potentially adjusted zonelist and alloc_flags */ @@ -4756,7 +4758,7 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order, struct alloc_context *ac, gfp_t *alloc_mask, unsigned int *alloc_flags) { - ac->high_zoneidx = gfp_zone(gfp_mask); + ac->highest_zoneidx = gfp_zone(gfp_mask); ac->zonelist = node_zonelist(preferred_nid, gfp_mask); ac->nodemask = nodemask; ac->migratetype = gfpflags_to_migratetype(gfp_mask); @@ -4795,7 +4797,7 @@ static inline void finalise_ac(gfp_t gfp_mask, struct alloc_context *ac) * may get reset for allocations that ignore memory policies. */ ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, - ac->high_zoneidx, ac->nodemask); + ac->highest_zoneidx, ac->nodemask); } /* @@ -6992,7 +6994,7 @@ void __init free_area_init_node(int nid, unsigned long *zones_size, unsigned long end_pfn = 0; /* pg_data_t should be reset to zero when it's allocated */ - WARN_ON(pgdat->nr_zones || pgdat->kswapd_classzone_idx); + WARN_ON(pgdat->nr_zones || pgdat->kswapd_highest_zoneidx); pgdat->node_id = nid; pgdat->node_start_pfn = node_start_pfn; diff --git a/mm/slab.c b/mm/slab.c index a896336..9350062 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3106,7 +3106,7 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) struct zonelist *zonelist; struct zoneref *z; struct zone *zone; - enum zone_type high_zoneidx = gfp_zone(flags); + enum zone_type highest_zoneidx = gfp_zone(flags); void *obj = NULL; struct page *page; int nid; @@ -3124,7 +3124,7 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) * Look through allowed nodes for objects available * from existing per node queues. */ - for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { + for_each_zone_zonelist(zone, z, zonelist, highest_zoneidx) { nid = zone_to_nid(zone); if (cpuset_zone_allowed(zone, flags) && diff --git a/mm/slub.c b/mm/slub.c index 1c55bf7..d220671 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1909,7 +1909,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags, struct zonelist *zonelist; struct zoneref *z; struct zone *zone; - enum zone_type high_zoneidx = gfp_zone(flags); + enum zone_type highest_zoneidx = gfp_zone(flags); void *object; unsigned int cpuset_mems_cookie; @@ -1938,7 +1938,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags, do { cpuset_mems_cookie = read_mems_allowed_begin(); zonelist = node_zonelist(mempolicy_slab_node(), flags); - for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { + for_each_zone_zonelist(zone, z, zonelist, highest_zoneidx) { struct kmem_cache_node *n; n = get_node(s, zone_to_nid(zone)); diff --git a/mm/vmscan.c b/mm/vmscan.c index dca623d..0616abe 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3133,8 +3133,8 @@ static bool allow_direct_reclaim(pg_data_t *pgdat) /* kswapd must be awake if processes are being throttled */ if (!wmark_ok && waitqueue_active(&pgdat->kswapd_wait)) { - if (READ_ONCE(pgdat->kswapd_classzone_idx) > ZONE_NORMAL) - WRITE_ONCE(pgdat->kswapd_classzone_idx, ZONE_NORMAL); + if (READ_ONCE(pgdat->kswapd_highest_zoneidx) > ZONE_NORMAL) + WRITE_ONCE(pgdat->kswapd_highest_zoneidx, ZONE_NORMAL); wake_up_interruptible(&pgdat->kswapd_wait); } @@ -3387,7 +3387,7 @@ static void age_active_anon(struct pglist_data *pgdat, } while (memcg); } -static bool pgdat_watermark_boosted(pg_data_t *pgdat, int classzone_idx) +static bool pgdat_watermark_boosted(pg_data_t *pgdat, int highest_zoneidx) { int i; struct zone *zone; @@ -3399,7 +3399,7 @@ static bool pgdat_watermark_boosted(pg_data_t *pgdat, int classzone_idx) * start prematurely when there is no boosting and a lower * zone is balanced. */ - for (i = classzone_idx; i >= 0; i--) { + for (i = highest_zoneidx; i >= 0; i--) { zone = pgdat->node_zones + i; if (!managed_zone(zone)) continue; @@ -3413,9 +3413,9 @@ static bool pgdat_watermark_boosted(pg_data_t *pgdat, int classzone_idx) /* * Returns true if there is an eligible zone balanced for the request order - * and classzone_idx + * and highest_zoneidx */ -static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx) +static bool pgdat_balanced(pg_data_t *pgdat, int order, int highest_zoneidx) { int i; unsigned long mark = -1; @@ -3425,19 +3425,19 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx) * Check watermarks bottom-up as lower zones are more likely to * meet watermarks. */ - for (i = 0; i <= classzone_idx; i++) { + for (i = 0; i <= highest_zoneidx; i++) { zone = pgdat->node_zones + i; if (!managed_zone(zone)) continue; mark = high_wmark_pages(zone); - if (zone_watermark_ok_safe(zone, order, mark, classzone_idx)) + if (zone_watermark_ok_safe(zone, order, mark, highest_zoneidx)) return true; } /* - * If a node has no populated zone within classzone_idx, it does not + * If a node has no populated zone within highest_zoneidx, it does not * need balancing by definition. This can happen if a zone-restricted * allocation tries to wake a remote kswapd. */ @@ -3463,7 +3463,8 @@ static void clear_pgdat_congested(pg_data_t *pgdat) * * Returns true if kswapd is ready to sleep */ -static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, int classzone_idx) +static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, + int highest_zoneidx) { /* * The throttled processes are normally woken up in balance_pgdat() as @@ -3485,7 +3486,7 @@ static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, int classzone_idx) if (pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES) return true; - if (pgdat_balanced(pgdat, order, classzone_idx)) { + if (pgdat_balanced(pgdat, order, highest_zoneidx)) { clear_pgdat_congested(pgdat); return true; } @@ -3549,7 +3550,7 @@ static bool kswapd_shrink_node(pg_data_t *pgdat, * or lower is eligible for reclaim until at least one usable zone is * balanced. */ -static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) +static int balance_pgdat(pg_data_t *pgdat, int order, int highest_zoneidx) { int i; unsigned long nr_soft_reclaimed; @@ -3577,7 +3578,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) * stall or direct reclaim until kswapd is finished. */ nr_boost_reclaim = 0; - for (i = 0; i <= classzone_idx; i++) { + for (i = 0; i <= highest_zoneidx; i++) { zone = pgdat->node_zones + i; if (!managed_zone(zone)) continue; @@ -3595,7 +3596,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) bool balanced; bool ret; - sc.reclaim_idx = classzone_idx; + sc.reclaim_idx = highest_zoneidx; /* * If the number of buffer_heads exceeds the maximum allowed @@ -3625,7 +3626,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) * on the grounds that the normal reclaim should be enough to * re-evaluate if boosting is required when kswapd next wakes. */ - balanced = pgdat_balanced(pgdat, sc.order, classzone_idx); + balanced = pgdat_balanced(pgdat, sc.order, highest_zoneidx); if (!balanced && nr_boost_reclaim) { nr_boost_reclaim = 0; goto restart; @@ -3725,7 +3726,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) if (boosted) { unsigned long flags; - for (i = 0; i <= classzone_idx; i++) { + for (i = 0; i <= highest_zoneidx; i++) { if (!zone_boosts[i]) continue; @@ -3740,7 +3741,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) * As there is now likely space, wakeup kcompact to defragment * pageblocks. */ - wakeup_kcompactd(pgdat, pageblock_order, classzone_idx); + wakeup_kcompactd(pgdat, pageblock_order, highest_zoneidx); } snapshot_refaults(NULL, pgdat); @@ -3758,22 +3759,22 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) } /* - * The pgdat->kswapd_classzone_idx is used to pass the highest zone index to be - * reclaimed by kswapd from the waker. If the value is MAX_NR_ZONES which is not - * a valid index then either kswapd runs for first time or kswapd couldn't sleep - * after previous reclaim attempt (node is still unbalanced). In that case - * return the zone index of the previous kswapd reclaim cycle. + * The pgdat->kswapd_highest_zoneidx is used to pass the highest zone index to + * be reclaimed by kswapd from the waker. If the value is MAX_NR_ZONES which is + * not a valid index then either kswapd runs for first time or kswapd couldn't + * sleep after previous reclaim attempt (node is still unbalanced). In that + * case return the zone index of the previous kswapd reclaim cycle. */ -static enum zone_type kswapd_classzone_idx(pg_data_t *pgdat, - enum zone_type prev_classzone_idx) +static enum zone_type kswapd_highest_zoneidx(pg_data_t *pgdat, + enum zone_type prev_highest_zoneidx) { - enum zone_type curr_idx = READ_ONCE(pgdat->kswapd_classzone_idx); + enum zone_type curr_idx = READ_ONCE(pgdat->kswapd_highest_zoneidx); - return curr_idx == MAX_NR_ZONES ? prev_classzone_idx : curr_idx; + return curr_idx == MAX_NR_ZONES ? prev_highest_zoneidx : curr_idx; } static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_order, - unsigned int classzone_idx) + unsigned int highest_zoneidx) { long remaining = 0; DEFINE_WAIT(wait); @@ -3790,7 +3791,7 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_o * eligible zone balanced that it's also unlikely that compaction will * succeed. */ - if (prepare_kswapd_sleep(pgdat, reclaim_order, classzone_idx)) { + if (prepare_kswapd_sleep(pgdat, reclaim_order, highest_zoneidx)) { /* * Compaction records what page blocks it recently failed to * isolate pages from and skips them in the future scanning. @@ -3803,18 +3804,19 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_o * We have freed the memory, now we should compact it to make * allocation of the requested order possible. */ - wakeup_kcompactd(pgdat, alloc_order, classzone_idx); + wakeup_kcompactd(pgdat, alloc_order, highest_zoneidx); remaining = schedule_timeout(HZ/10); /* - * If woken prematurely then reset kswapd_classzone_idx and + * If woken prematurely then reset kswapd_highest_zoneidx and * order. The values will either be from a wakeup request or * the previous request that slept prematurely. */ if (remaining) { - WRITE_ONCE(pgdat->kswapd_classzone_idx, - kswapd_classzone_idx(pgdat, classzone_idx)); + WRITE_ONCE(pgdat->kswapd_highest_zoneidx, + kswapd_highest_zoneidx(pgdat, + highest_zoneidx)); if (READ_ONCE(pgdat->kswapd_order) < reclaim_order) WRITE_ONCE(pgdat->kswapd_order, reclaim_order); @@ -3829,7 +3831,7 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_o * go fully to sleep until explicitly woken up. */ if (!remaining && - prepare_kswapd_sleep(pgdat, reclaim_order, classzone_idx)) { + prepare_kswapd_sleep(pgdat, reclaim_order, highest_zoneidx)) { trace_mm_vmscan_kswapd_sleep(pgdat->node_id); /* @@ -3871,7 +3873,7 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_o static int kswapd(void *p) { unsigned int alloc_order, reclaim_order; - unsigned int classzone_idx = MAX_NR_ZONES - 1; + unsigned int highest_zoneidx = MAX_NR_ZONES - 1; pg_data_t *pgdat = (pg_data_t*)p; struct task_struct *tsk = current; const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); @@ -3895,22 +3897,24 @@ static int kswapd(void *p) set_freezable(); WRITE_ONCE(pgdat->kswapd_order, 0); - WRITE_ONCE(pgdat->kswapd_classzone_idx, MAX_NR_ZONES); + WRITE_ONCE(pgdat->kswapd_highest_zoneidx, MAX_NR_ZONES); for ( ; ; ) { bool ret; alloc_order = reclaim_order = READ_ONCE(pgdat->kswapd_order); - classzone_idx = kswapd_classzone_idx(pgdat, classzone_idx); + highest_zoneidx = kswapd_highest_zoneidx(pgdat, + highest_zoneidx); kswapd_try_sleep: kswapd_try_to_sleep(pgdat, alloc_order, reclaim_order, - classzone_idx); + highest_zoneidx); - /* Read the new order and classzone_idx */ + /* Read the new order and highest_zoneidx */ alloc_order = reclaim_order = READ_ONCE(pgdat->kswapd_order); - classzone_idx = kswapd_classzone_idx(pgdat, classzone_idx); + highest_zoneidx = kswapd_highest_zoneidx(pgdat, + highest_zoneidx); WRITE_ONCE(pgdat->kswapd_order, 0); - WRITE_ONCE(pgdat->kswapd_classzone_idx, MAX_NR_ZONES); + WRITE_ONCE(pgdat->kswapd_highest_zoneidx, MAX_NR_ZONES); ret = try_to_freeze(); if (kthread_should_stop()) @@ -3931,9 +3935,10 @@ static int kswapd(void *p) * but kcompactd is woken to compact for the original * request (alloc_order). */ - trace_mm_vmscan_kswapd_wake(pgdat->node_id, classzone_idx, + trace_mm_vmscan_kswapd_wake(pgdat->node_id, highest_zoneidx, alloc_order); - reclaim_order = balance_pgdat(pgdat, alloc_order, classzone_idx); + reclaim_order = balance_pgdat(pgdat, alloc_order, + highest_zoneidx); if (reclaim_order < alloc_order) goto kswapd_try_sleep; } @@ -3951,7 +3956,7 @@ static int kswapd(void *p) * needed. */ void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order, - enum zone_type classzone_idx) + enum zone_type highest_zoneidx) { pg_data_t *pgdat; enum zone_type curr_idx; @@ -3963,10 +3968,10 @@ void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order, return; pgdat = zone->zone_pgdat; - curr_idx = READ_ONCE(pgdat->kswapd_classzone_idx); + curr_idx = READ_ONCE(pgdat->kswapd_highest_zoneidx); - if (curr_idx == MAX_NR_ZONES || curr_idx < classzone_idx) - WRITE_ONCE(pgdat->kswapd_classzone_idx, classzone_idx); + if (curr_idx == MAX_NR_ZONES || curr_idx < highest_zoneidx) + WRITE_ONCE(pgdat->kswapd_highest_zoneidx, highest_zoneidx); if (READ_ONCE(pgdat->kswapd_order) < order) WRITE_ONCE(pgdat->kswapd_order, order); @@ -3976,8 +3981,8 @@ void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order, /* Hopeless node, leave it to direct reclaim if possible */ if (pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES || - (pgdat_balanced(pgdat, order, classzone_idx) && - !pgdat_watermark_boosted(pgdat, classzone_idx))) { + (pgdat_balanced(pgdat, order, highest_zoneidx) && + !pgdat_watermark_boosted(pgdat, highest_zoneidx))) { /* * There may be plenty of free memory available, but it's too * fragmented for high-order allocations. Wake up kcompactd @@ -3986,11 +3991,11 @@ void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order, * ratelimit its work. */ if (!(gfp_flags & __GFP_DIRECT_RECLAIM)) - wakeup_kcompactd(pgdat, order, classzone_idx); + wakeup_kcompactd(pgdat, order, highest_zoneidx); return; } - trace_mm_vmscan_wakeup_kswapd(pgdat->node_id, classzone_idx, order, + trace_mm_vmscan_wakeup_kswapd(pgdat->node_id, highest_zoneidx, order, gfp_flags); wake_up_interruptible(&pgdat->kswapd_wait); }