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Mon, 05 Sep 2022 03:10:27 +0000 From: Oscar Salvador To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Eric Dumazet , Waiman Long , Suren Baghdasaryan , Marco Elver , Andrey Konovalov , Alexander Potapenko , Oscar Salvador Subject: [PATCH v2 1/3] lib/stackdepot: Add a refcount field in stack_record Date: Mon, 5 Sep 2022 05:10:10 +0200 Message-Id: <20220905031012.4450-2-osalvador@suse.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220905031012.4450-1-osalvador@suse.de> References: <20220905031012.4450-1-osalvador@suse.de> MIME-Version: 1.0 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1662347429; a=rsa-sha256; cv=none; b=1+0/sB1T2PTdcAOLf6it7ohRU/apmcvdJ2uXEg5oxNUWkHCYpb29+cyh6FGmdPoS5yrHV8 uG0p5LuhiKQHhtsxK6lKyDFfRLhlteV+d1F5gjCkifurjee4ZMvSJRvgUbz02tJS1FqfGE S+yyeWumF+XWXXd9I5Tvasq8VIT2Ro4= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=P3sUOHNo; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=TiBDk6oZ; 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spf=pass (imf04.hostedemail.com: domain of osalvador@suse.de designates 195.135.220.29 as permitted sender) smtp.mailfrom=osalvador@suse.de; dmarc=pass (policy=none) header.from=suse.de X-Rspamd-Server: rspam01 X-HE-Tag: 1662347429-601107 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: We want to filter out page_owner output and print only those stacks that have been repeated beyond a certain threshold. This gives us the chance to get rid of a lot of noise. In order to do that, we need to keep track of how many repeated stacks (for allocation) do we have, so we add a new refcount_t field in the stack_record struct. Note that this might increase the size of the struct for some architectures. E.g: x86_64 is not affected due to alignment, but x86 32bits might. The alternative would be to have some kind of struct like this: struct track_stacks { struct stack_record *stack; struct track_stacks *next; refcount_t stack_count; But ithat would imply to perform more allocations and glue everything together, which would make the code more complex, so I think that going with a new field in the struct stack_record is good enough. Note that on __set_page_owner_handle(), page_owner->handle is set, and on __reset_page_owner(), page_owner->free_handle is set. We are interested in page_owner->handle, so when __set_page_owner() gets called, we derive the stack_record struct from page_owner->handle, and we increment its refcount_t field; and when __reset_page_owner() gets called, we derive its stack_record from page_owner->handle() and we decrement its refcount_t field. Signed-off-by: Oscar Salvador --- include/linux/stackdepot.h | 13 ++++++- lib/stackdepot.c | 79 +++++++++++++++++++++++++++++++------- mm/kasan/common.c | 3 +- mm/page_owner.c | 14 +++++-- 4 files changed, 89 insertions(+), 20 deletions(-) diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h index bc2797955de9..4e3a88f135ee 100644 --- a/include/linux/stackdepot.h +++ b/include/linux/stackdepot.h @@ -15,9 +15,16 @@ typedef u32 depot_stack_handle_t; +enum stack_depot_action { + STACK_DEPOT_ACTION_NONE, + STACK_DEPOT_ACTION_COUNT, +}; + depot_stack_handle_t __stack_depot_save(unsigned long *entries, unsigned int nr_entries, - gfp_t gfp_flags, bool can_alloc); + gfp_t gfp_flags, bool can_alloc, + enum stack_depot_action action); +void stack_depot_dec_count(depot_stack_handle_t handle); /* * Every user of stack depot has to call stack_depot_init() during its own init @@ -55,6 +62,10 @@ static inline int stack_depot_early_init(void) { return 0; } depot_stack_handle_t stack_depot_save(unsigned long *entries, unsigned int nr_entries, gfp_t gfp_flags); +depot_stack_handle_t stack_depot_save_action(unsigned long *entries, + unsigned int nr_entries, + gfp_t gfp_flags, + enum stack_depot_action action); unsigned int stack_depot_fetch(depot_stack_handle_t handle, unsigned long **entries); diff --git a/lib/stackdepot.c b/lib/stackdepot.c index e73fda23388d..a806ef58a385 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -64,6 +64,7 @@ struct stack_record { u32 hash; /* Hash in the hastable */ u32 size; /* Number of frames in the stack */ union handle_parts handle; + refcount_t count; /* Number of the same repeated stacks */ unsigned long entries[]; /* Variable-sized array of entries. */ }; @@ -140,6 +141,7 @@ depot_alloc_stack(unsigned long *entries, int size, u32 hash, void **prealloc) stack->handle.slabindex = depot_index; stack->handle.offset = depot_offset >> STACK_ALLOC_ALIGN; stack->handle.valid = 1; + refcount_set(&stack->count, 1); memcpy(stack->entries, entries, flex_array_size(stack, entries, size)); depot_offset += required_size; @@ -341,6 +343,29 @@ void stack_depot_print(depot_stack_handle_t stack) } EXPORT_SYMBOL_GPL(stack_depot_print); +static struct stack_record *stack_depot_getstack(depot_stack_handle_t handle) +{ + union handle_parts parts = { .handle = handle }; + void *slab; + size_t offset = parts.offset << STACK_ALLOC_ALIGN; + struct stack_record *stack; + + if(!handle) + return NULL; + + if (parts.slabindex > depot_index) { + WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n", + parts.slabindex, depot_index, handle); + return NULL; + } + slab = stack_slabs[parts.slabindex]; + if (!slab) + return NULL; + + stack = slab + offset; + return stack; +} + /** * stack_depot_fetch - Fetch stack entries from a depot * @@ -353,30 +378,42 @@ EXPORT_SYMBOL_GPL(stack_depot_print); unsigned int stack_depot_fetch(depot_stack_handle_t handle, unsigned long **entries) { - union handle_parts parts = { .handle = handle }; - void *slab; - size_t offset = parts.offset << STACK_ALLOC_ALIGN; struct stack_record *stack; *entries = NULL; if (!handle) return 0; - if (parts.slabindex > depot_index) { - WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n", - parts.slabindex, depot_index, handle); - return 0; - } - slab = stack_slabs[parts.slabindex]; - if (!slab) + stack = stack_depot_getstack(handle); + if (!stack) return 0; - stack = slab + offset; *entries = stack->entries; return stack->size; } EXPORT_SYMBOL_GPL(stack_depot_fetch); +static void stack_depot_inc_count(struct stack_record *stack) +{ + refcount_inc(&stack->count); +} + +void stack_depot_dec_count(depot_stack_handle_t handle) +{ + struct stack_record *stack = NULL; + + stack = stack_depot_getstack(handle); + if (stack) { + /* + * page_owner creates some stacks via create_dummy_stack(). + * We are not interested in those, so make sure we only decrement + * "valid" stacks. + */ + if (refcount_read(&stack->count) > 1) + refcount_dec(&stack->count); + } +} + /** * __stack_depot_save - Save a stack trace from an array * @@ -402,7 +439,8 @@ EXPORT_SYMBOL_GPL(stack_depot_fetch); */ depot_stack_handle_t __stack_depot_save(unsigned long *entries, unsigned int nr_entries, - gfp_t alloc_flags, bool can_alloc) + gfp_t alloc_flags, bool can_alloc, + enum stack_depot_action action) { struct stack_record *found = NULL, **bucket; depot_stack_handle_t retval = 0; @@ -488,8 +526,11 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries, /* Nobody used this memory, ok to free it. */ free_pages((unsigned long)prealloc, STACK_ALLOC_ORDER); } - if (found) + if (found) { retval = found->handle.handle; + if (action == STACK_DEPOT_ACTION_COUNT) + stack_depot_inc_count(found); + } fast_exit: return retval; } @@ -511,6 +552,16 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries, unsigned int nr_entries, gfp_t alloc_flags) { - return __stack_depot_save(entries, nr_entries, alloc_flags, true); + return __stack_depot_save(entries, nr_entries, alloc_flags, true, + STACK_DEPOT_ACTION_NONE); } EXPORT_SYMBOL_GPL(stack_depot_save); + +depot_stack_handle_t stack_depot_save_action(unsigned long *entries, + unsigned int nr_entries, + gfp_t alloc_flags, + enum stack_depot_action action) +{ + return __stack_depot_save(entries, nr_entries, alloc_flags, true, action); +} +EXPORT_SYMBOL_GPL(stack_depot_save_action); diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 69f583855c8b..8077c6e70815 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -36,7 +36,8 @@ depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc) unsigned int nr_entries; nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); - return __stack_depot_save(entries, nr_entries, flags, can_alloc); + return __stack_depot_save(entries, nr_entries, flags, can_alloc, + STACK_DEPOT_ACTION_NONE); } void kasan_set_track(struct kasan_track *track, gfp_t flags) diff --git a/mm/page_owner.c b/mm/page_owner.c index e4c6f3f1695b..8730f377fa91 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -106,7 +106,8 @@ static inline struct page_owner *get_page_owner(struct page_ext *page_ext) return (void *)page_ext + page_owner_ops.offset; } -static noinline depot_stack_handle_t save_stack(gfp_t flags) +static noinline depot_stack_handle_t save_stack(gfp_t flags, + enum stack_depot_action action) { unsigned long entries[PAGE_OWNER_STACK_DEPTH]; depot_stack_handle_t handle; @@ -125,7 +126,7 @@ static noinline depot_stack_handle_t save_stack(gfp_t flags) current->in_page_owner = 1; nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 2); - handle = stack_depot_save(entries, nr_entries, flags); + handle = stack_depot_save_action(entries, nr_entries, flags, action); if (!handle) handle = failure_handle; @@ -138,6 +139,7 @@ void __reset_page_owner(struct page *page, unsigned short order) int i; struct page_ext *page_ext; depot_stack_handle_t handle; + depot_stack_handle_t alloc_handle; struct page_owner *page_owner; u64 free_ts_nsec = local_clock(); @@ -145,7 +147,10 @@ void __reset_page_owner(struct page *page, unsigned short order) if (unlikely(!page_ext)) return; - handle = save_stack(GFP_NOWAIT | __GFP_NOWARN); + page_owner = get_page_owner(page_ext); + alloc_handle = page_owner->handle; + + handle = save_stack(GFP_NOWAIT | __GFP_NOWARN, STACK_DEPOT_ACTION_NONE); for (i = 0; i < (1 << order); i++) { __clear_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags); page_owner = get_page_owner(page_ext); @@ -153,6 +158,7 @@ void __reset_page_owner(struct page *page, unsigned short order) page_owner->free_ts_nsec = free_ts_nsec; page_ext = page_ext_next(page_ext); } + stack_depot_dec_count(alloc_handle); } static inline void __set_page_owner_handle(struct page_ext *page_ext, @@ -189,7 +195,7 @@ noinline void __set_page_owner(struct page *page, unsigned short order, if (unlikely(!page_ext)) return; - handle = save_stack(gfp_mask); + handle = save_stack(gfp_mask, STACK_DEPOT_ACTION_COUNT); __set_page_owner_handle(page_ext, handle, order, gfp_mask); } From patchwork Mon Sep 5 03:10:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 12965435 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49593ECAAD5 for ; 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Mon, 5 Sep 2022 03:10:28 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id YErHBqRoFWMeHwAAMHmgww (envelope-from ); Mon, 05 Sep 2022 03:10:28 +0000 From: Oscar Salvador To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Eric Dumazet , Waiman Long , Suren Baghdasaryan , Marco Elver , Andrey Konovalov , Alexander Potapenko , Oscar Salvador Subject: [PATCH v2 2/3] mm, page_owner: Add page_owner_stacks file to print out only stacks and their counter Date: Mon, 5 Sep 2022 05:10:11 +0200 Message-Id: <20220905031012.4450-3-osalvador@suse.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220905031012.4450-1-osalvador@suse.de> References: <20220905031012.4450-1-osalvador@suse.de> MIME-Version: 1.0 ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=xmxC5alW; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=EkSlzIos; 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dkim=pass header.d=suse.de header.s=susede2_rsa header.b=xmxC5alW; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=EkSlzIos; spf=pass (imf08.hostedemail.com: domain of osalvador@suse.de designates 195.135.220.29 as permitted sender) smtp.mailfrom=osalvador@suse.de; dmarc=pass (policy=none) header.from=suse.de X-Rspam-User: X-Stat-Signature: 3j5f8w67czypihu7gwfikdyaq8ywras3 X-Rspamd-Queue-Id: 10E2616006F X-Rspamd-Server: rspam05 X-HE-Tag: 1662347429-189350 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: We might be only interested in knowing about stacks <-> count relationship, so instead of having to fiddle with page_owner output and screen through pfns, let us add a new file called 'page_owner_stacks' that does just that. By cating such file, we will get all the stacktraces followed by its counter, so we can have a more global view. Signed-off-by: Oscar Salvador Reported-by: kernel test robot --- include/linux/stackdepot.h | 1 + lib/stackdepot.c | 40 ++++++++++++++++++++++++++++++++++++++ mm/page_owner.c | 25 ++++++++++++++++++++++++ 3 files changed, 66 insertions(+) diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h index 4e3a88f135ee..19d3f8295df8 100644 --- a/include/linux/stackdepot.h +++ b/include/linux/stackdepot.h @@ -25,6 +25,7 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries, gfp_t gfp_flags, bool can_alloc, enum stack_depot_action action); void stack_depot_dec_count(depot_stack_handle_t handle); +int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos); /* * Every user of stack depot has to call stack_depot_init() during its own init diff --git a/lib/stackdepot.c b/lib/stackdepot.c index a806ef58a385..a198b2dbe3fb 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -565,3 +565,43 @@ depot_stack_handle_t stack_depot_save_action(unsigned long *entries, return __stack_depot_save(entries, nr_entries, alloc_flags, true, action); } EXPORT_SYMBOL_GPL(stack_depot_save_action); + +int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos) +{ + int i = *pos, ret = 0; + struct stack_record **stacks, *stack; + static struct stack_record *last = NULL; + unsigned long stack_table_entries = stack_hash_mask + 1; + + /* Continue from the last stack if we have one */ + if (last) { + stack = last->next; + } else { +new_table: + stacks = &stack_table[i]; + stack = (struct stack_record *)stacks; + } + + for (; stack; stack = stack->next) { + if (!stack->size || stack->size < 0 || + stack->size > size || stack->handle.valid != 1 || + refcount_read(&stack->count) < 1) + continue; + + ret += stack_trace_snprint(buf, size, stack->entries, stack->size, 0); + ret += scnprintf(buf + ret, size - ret, "stack count: %d\n\n", + refcount_read(&stack->count)); + last = stack; + return ret; + } + + i++; + *pos = i; + last = NULL; + + /* Keep looking all tables for valid stacks */ + if (i < stack_table_entries) + goto new_table; + + return 0; +} diff --git a/mm/page_owner.c b/mm/page_owner.c index 8730f377fa91..d88e6b4aefa0 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -664,6 +664,29 @@ static void init_early_allocated_pages(void) init_zones_in_node(pgdat); } +static ssize_t read_page_owner_stacks(struct file *file, char __user *buf, + size_t count, loff_t *pos) +{ + char *kbuf; + int ret = 0; + + count = min_t(size_t, count, PAGE_SIZE); + kbuf = kmalloc(count, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + ret += stack_depot_print_stacks_threshold(kbuf, count, pos); + if (copy_to_user(buf, kbuf, ret)) + ret = -EFAULT; + + kfree(kbuf); + return ret; +} + +static const struct file_operations proc_page_owner_stacks = { + .read = read_page_owner_stacks, +}; + static const struct file_operations proc_page_owner_operations = { .read = read_page_owner, }; @@ -677,6 +700,8 @@ static int __init pageowner_init(void) debugfs_create_file("page_owner", 0400, NULL, NULL, &proc_page_owner_operations); + debugfs_create_file("page_owner_stacks", 0400, NULL, NULL, + &proc_page_owner_stacks); 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Mon, 05 Sep 2022 03:10:28 +0000 From: Oscar Salvador To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Eric Dumazet , Waiman Long , Suren Baghdasaryan , Marco Elver , Andrey Konovalov , Alexander Potapenko , Oscar Salvador Subject: [PATCH v2 3/3] mm,page_owner: Filter out stacks by a threshold counter Date: Mon, 5 Sep 2022 05:10:12 +0200 Message-Id: <20220905031012.4450-4-osalvador@suse.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220905031012.4450-1-osalvador@suse.de> References: <20220905031012.4450-1-osalvador@suse.de> MIME-Version: 1.0 ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=qerU60J2; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=DHBa2kCP; spf=pass (imf06.hostedemail.com: domain of osalvador@suse.de designates 195.135.220.28 as permitted sender) smtp.mailfrom=osalvador@suse.de; dmarc=pass (policy=none) header.from=suse.de ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1662347430; a=rsa-sha256; cv=none; b=VtFVLMIks8NHYipMkCK+tVPpfZc2B/aR6HMxc9PxBFkI44+ZwKmuaLjFK8JfPlH3cRRg4m FTXCcE31WB0Jrc647UR2p24dPgd4GJUJAzi0L/40PRZhbN2MPOZiQe6RFzPHA3E2UL0XYO x1v+1wme2idX8zEI7JwClyvzr2V6S/U= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1662347430; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=caEWLfqDu+y+boYO54sxVXmuA4zEki6s/GhDf6KoI7g=; b=cfTBLwg6GAuwM9JyG/W0LqYH0xIgU5fc7jrE+jpeqgPhFtG8ys3aQ6rILUDrd3kWmWLCTJ FomaN5/du1w7n18QoZZoBYdltwu9wh1IPyJCVQwFLDjdWTYAUwM8JVfVQKryipNF40BARg jZoaAq3cLWXNB+sDlyGNI3FtGCQ26n0= X-Rspam-User: Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=qerU60J2; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=DHBa2kCP; spf=pass (imf06.hostedemail.com: domain of osalvador@suse.de designates 195.135.220.28 as permitted sender) smtp.mailfrom=osalvador@suse.de; dmarc=pass (policy=none) header.from=suse.de X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 988AD18005B X-Stat-Signature: hh3nytrtq4shgog75n6u791j586ht9ji X-HE-Tag: 1662347430-977912 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: We want to be able to filter out the output on a threshold basis, in this way we can get rid of a lot of noise and focus only on those stacks which have an allegedly high counter. We can control the threshold value by a new file called 'page_owner_threshold', which is 0 by default. Signed-off-by: Oscar Salvador --- include/linux/stackdepot.h | 3 ++- lib/stackdepot.c | 6 +++-- mm/page_owner.c | 51 +++++++++++++++++++++++++++++++++++++- 3 files changed, 56 insertions(+), 4 deletions(-) diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h index 19d3f8295df8..742038216cd0 100644 --- a/include/linux/stackdepot.h +++ b/include/linux/stackdepot.h @@ -25,7 +25,8 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries, gfp_t gfp_flags, bool can_alloc, enum stack_depot_action action); void stack_depot_dec_count(depot_stack_handle_t handle); -int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos); +int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos, + unsigned long threshold); /* * Every user of stack depot has to call stack_depot_init() during its own init diff --git a/lib/stackdepot.c b/lib/stackdepot.c index a198b2dbe3fb..a31e882853ab 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -566,7 +566,8 @@ depot_stack_handle_t stack_depot_save_action(unsigned long *entries, } EXPORT_SYMBOL_GPL(stack_depot_save_action); -int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos) +int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos, + unsigned long threshold) { int i = *pos, ret = 0; struct stack_record **stacks, *stack; @@ -585,7 +586,8 @@ int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos) for (; stack; stack = stack->next) { if (!stack->size || stack->size < 0 || stack->size > size || stack->handle.valid != 1 || - refcount_read(&stack->count) < 1) + refcount_read(&stack->count) < 1 || + refcount_read(&stack->count) < threshold) continue; ret += stack_trace_snprint(buf, size, stack->entries, stack->size, 0); diff --git a/mm/page_owner.c b/mm/page_owner.c index d88e6b4aefa0..5b895d347c5f 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -43,6 +43,8 @@ static depot_stack_handle_t early_handle; static void init_early_allocated_pages(void); +static unsigned long threshold; + static int __init early_page_owner_param(char *buf) { int ret = kstrtobool(buf, &page_owner_enabled); @@ -675,7 +677,7 @@ static ssize_t read_page_owner_stacks(struct file *file, char __user *buf, if (!kbuf) return -ENOMEM; - ret += stack_depot_print_stacks_threshold(kbuf, count, pos); + ret += stack_depot_print_stacks_threshold(kbuf, count, pos, threshold); if (copy_to_user(buf, kbuf, ret)) ret = -EFAULT; @@ -683,6 +685,51 @@ static ssize_t read_page_owner_stacks(struct file *file, char __user *buf, return ret; } +static int page_owner_threshold_show(struct seq_file *p, void *v) +{ + seq_printf(p, "%lu\n", threshold); + return 0; +} + +static ssize_t write_page_owner_threshold(struct file *file, const char __user *buf, + size_t count, loff_t *pos) +{ + char *kbuf; + int ret = 0; + + count = min_t(size_t, count, PAGE_SIZE); + kbuf = kmalloc(count, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + if (copy_from_user(kbuf, buf, count)) { + ret = -EFAULT; + goto out; + } + + kbuf[count - 1] = '\0'; + + ret = kstrtoul(kbuf, 10, &threshold); + +out: + kfree(kbuf); + return ret ? ret : count; +} + +static int open_page_owner_threshold(struct inode *inode, struct file *file) +{ + return single_open(file, page_owner_threshold_show, NULL); +} + + +static const struct file_operations proc_page_owner_threshold = { + .open = open_page_owner_threshold, + .read = seq_read, + .llseek = seq_lseek, + .write = write_page_owner_threshold, + .release = single_release, +}; + static const struct file_operations proc_page_owner_stacks = { .read = read_page_owner_stacks, }; @@ -702,6 +749,8 @@ static int __init pageowner_init(void) &proc_page_owner_operations); debugfs_create_file("page_owner_stacks", 0400, NULL, NULL, &proc_page_owner_stacks); + debugfs_create_file("page_owner_threshold", 0600, NULL, NULL, + &proc_page_owner_threshold); return 0; }