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Thu, 8 Feb 2024 23:45:11 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id uE7SK4dnxWWUfAAAD6G6ig (envelope-from ); Thu, 08 Feb 2024 23:45:11 +0000 From: Oscar Salvador To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Marco Elver , Andrey Konovalov , Alexander Potapenko , Oscar Salvador Subject: [PATCH v7 1/4] lib/stackdepot: Move stack_record struct definition into the header Date: Fri, 9 Feb 2024 00:45:36 +0100 Message-ID: <20240208234539.19113-2-osalvador@suse.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240208234539.19113-1-osalvador@suse.de> References: <20240208234539.19113-1-osalvador@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Authentication-Results: smtp-out1.suse.de; none X-Spam-Level: ******** X-Spam-Score: 8.80 X-Spamd-Result: default: False [8.80 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; BAYES_SPAM(5.10)[100.00%]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_MISSING_CHARSET(2.50)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; BROKEN_CONTENT_TYPE(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; RCPT_COUNT_SEVEN(0.00)[9]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_CC(0.00)[vger.kernel.org,kvack.org,suse.com,suse.cz,google.com,gmail.com,suse.de]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO Content-Type: text/plain; charset="utf-8" In order to move the heavy lifting into page_owner code, this one needs to have access to the stack_record structure, which right now sits in lib/stackdepot.c. Move it to the stackdepot.h header so page_owner can access stack_record's struct fields. Signed-off-by: Oscar Salvador --- include/linux/stackdepot.h | 44 ++++++++++++++++++++++++++++++++++++++ lib/stackdepot.c | 43 ------------------------------------- 2 files changed, 44 insertions(+), 43 deletions(-) diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h index adcbb8f23600..d0dcf4aebfb4 100644 --- a/include/linux/stackdepot.h +++ b/include/linux/stackdepot.h @@ -30,6 +30,50 @@ typedef u32 depot_stack_handle_t; */ #define STACK_DEPOT_EXTRA_BITS 5 =20 +#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8) + +#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */ +#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER)) +#define DEPOT_STACK_ALIGN 4 +#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALI= GN) +#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \ + STACK_DEPOT_EXTRA_BITS) + +/* Compact structure that stores a reference to a stack. */ +union handle_parts { + depot_stack_handle_t handle; + struct { + u32 pool_index : DEPOT_POOL_INDEX_BITS; + u32 offset : DEPOT_OFFSET_BITS; + u32 extra : STACK_DEPOT_EXTRA_BITS; + }; +}; + +struct stack_record { + struct list_head hash_list; /* Links in the hash table */ + u32 hash; /* Hash in hash table */ + u32 size; /* Number of stored frames */ + union handle_parts handle; /* Constant after initialization */ + refcount_t count; + union { + unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES]; /* Frames */ + struct { + /* + * An important invariant of the implementation is to + * only place a stack record onto the freelist iff its + * refcount is zero. Because stack records with a zero + * refcount are never considered as valid, it is safe to + * union @entries and freelist management state below. + * Conversely, as soon as an entry is off the freelist + * and its refcount becomes non-zero, the below must not + * be accessed until being placed back on the freelist. + */ + struct list_head free_list; /* Links in the freelist */ + unsigned long rcu_state; /* RCU cookie */ + }; + }; +}; + typedef u32 depot_flags_t; =20 /* diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 5caa1f566553..16c8a1bf0008 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -35,14 +35,6 @@ #include #include =20 -#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8) - -#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */ -#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER)) -#define DEPOT_STACK_ALIGN 4 -#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALI= GN) -#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \ - STACK_DEPOT_EXTRA_BITS) #if IS_ENABLED(CONFIG_KMSAN) && CONFIG_STACKDEPOT_MAX_FRAMES >=3D 32 /* * KMSAN is frequently used in fuzzing scenarios and thus saves a lot of s= tack @@ -58,41 +50,6 @@ (((1LL << (DEPOT_POOL_INDEX_BITS)) < DEPOT_POOLS_CAP) ? \ (1LL << (DEPOT_POOL_INDEX_BITS)) : DEPOT_POOLS_CAP) =20 -/* Compact structure that stores a reference to a stack. */ -union handle_parts { - depot_stack_handle_t handle; - struct { - u32 pool_index : DEPOT_POOL_INDEX_BITS; - u32 offset : DEPOT_OFFSET_BITS; - u32 extra : STACK_DEPOT_EXTRA_BITS; - }; -}; - -struct stack_record { - struct list_head hash_list; /* Links in the hash table */ - u32 hash; /* Hash in hash table */ - u32 size; /* Number of stored frames */ - union handle_parts handle; /* Constant after initialization */ - refcount_t count; - union { - unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES]; /* Frames */ - struct { - /* - * An important invariant of the implementation is to - * only place a stack record onto the freelist iff its - * refcount is zero. Because stack records with a zero - * refcount are never considered as valid, it is safe to - * union @entries and freelist management state below. - * Conversely, as soon as an entry is off the freelist - * and its refcount becomes non-zero, the below must not - * be accessed until being placed back on the freelist. - */ - struct list_head free_list; /* Links in the freelist */ - unsigned long rcu_state; /* RCU cookie */ - }; - }; -}; - #define DEPOT_STACK_RECORD_SIZE \ ALIGN(sizeof(struct stack_record), 1 << DEPOT_STACK_ALIGN) =20 --=20 2.43.0 From nobody Sun Feb 8 13:39:00 2026 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1980750A6D for ; Thu, 8 Feb 2024 23:45:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; 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charset="utf-8" page_owner needs to increment a stack_record refcount when a new allocation occurs, and decrement it on a free operation. In order to do that, we need to have a way to get a stack_record from a handle. Implement stack_depot_get_stack() which just does that, and make it public so page_owner can use it. Also implement {inc,dec}_stack_record_count() which increments or decrements on respective allocation and free operations, via __reset_page_owner() (free operation) and __set_page_owner() (alloc operation). Signed-off-by: Oscar Salvador --- include/linux/stackdepot.h | 8 ++++++++ lib/stackdepot.c | 8 ++++++++ mm/page_owner.c | 30 ++++++++++++++++++++++++++++++ 3 files changed, 46 insertions(+) diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h index d0dcf4aebfb4..ac62de4d4999 100644 --- a/include/linux/stackdepot.h +++ b/include/linux/stackdepot.h @@ -175,6 +175,14 @@ depot_stack_handle_t stack_depot_save_flags(unsigned l= ong *entries, depot_stack_handle_t stack_depot_save(unsigned long *entries, unsigned int nr_entries, gfp_t gfp_flags); =20 +/** + * stack_depo_get_stack - Get a pointer to a stack struct + * @handle: Stack depot handle + * + * Return: Returns a pointer to a stack struct + */ +struct stack_record *stack_depot_get_stack(depot_stack_handle_t handle); + /** * stack_depot_fetch - Fetch a stack trace from stack depot * diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 16c8a1bf0008..197c355601f9 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -681,6 +681,14 @@ depot_stack_handle_t stack_depot_save(unsigned long *e= ntries, } EXPORT_SYMBOL_GPL(stack_depot_save); =20 +struct stack_record *stack_depot_get_stack(depot_stack_handle_t handle) +{ + if (!handle) + return NULL; + + return depot_fetch_stack(handle); +} + unsigned int stack_depot_fetch(depot_stack_handle_t handle, unsigned long **entries) { diff --git a/mm/page_owner.c b/mm/page_owner.c index 5634e5d890f8..0adf41702b9d 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -61,6 +61,22 @@ static __init bool need_page_owner(void) return page_owner_enabled; } =20 +static void inc_stack_record_count(depot_stack_handle_t handle) +{ + struct stack_record *stack =3D stack_depot_get_stack(handle); + + if (stack) + refcount_inc(&stack->count); +} + +static void dec_stack_record_count(depot_stack_handle_t handle) +{ + struct stack_record *stack =3D stack_depot_get_stack(handle); + + if (stack) + refcount_dec(&stack->count); +} + static __always_inline depot_stack_handle_t create_dummy_stack(void) { unsigned long entries[4]; @@ -140,6 +156,7 @@ void __reset_page_owner(struct page *page, unsigned sho= rt 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 =3D local_clock(); =20 @@ -147,6 +164,9 @@ void __reset_page_owner(struct page *page, unsigned sho= rt order) if (unlikely(!page_ext)) return; =20 + page_owner =3D get_page_owner(page_ext); + alloc_handle =3D page_owner->handle; + handle =3D save_stack(GFP_NOWAIT | __GFP_NOWARN); for (i =3D 0; i < (1 << order); i++) { __clear_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags); @@ -158,6 +178,15 @@ void __reset_page_owner(struct page *page, unsigned sh= ort order) page_ext =3D page_ext_next(page_ext); } page_ext_put(page_ext); + if (alloc_handle !=3D early_handle) + /* + * early_handle is being set as a handle for all those + * early allocated pages. 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Thu, 8 Feb 2024 23:45:15 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id WI3VA4tnxWWUfAAAD6G6ig (envelope-from ); Thu, 08 Feb 2024 23:45:15 +0000 From: Oscar Salvador To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Marco Elver , Andrey Konovalov , Alexander Potapenko , Oscar Salvador Subject: [PATCH v7 3/4] mm,page_owner: Display all stacks and their count Date: Fri, 9 Feb 2024 00:45:38 +0100 Message-ID: <20240208234539.19113-4-osalvador@suse.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240208234539.19113-1-osalvador@suse.de> References: <20240208234539.19113-1-osalvador@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Authentication-Results: smtp-out1.suse.de; none X-Spamd-Result: default: False [1.90 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; R_MISSING_CHARSET(2.50)[]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RCPT_COUNT_SEVEN(0.00)[9]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_CC(0.00)[vger.kernel.org,kvack.org,suse.com,suse.cz,google.com,gmail.com,suse.de]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] X-Spam-Level: * X-Spam-Score: 1.90 X-Spam-Flag: NO Content-Type: text/plain; charset="utf-8" This patch adds a new file called 'page_owner_stacks', which will show all stacks that were added by page_owner followed by their counting, giving us a clear overview of stack <-> count relationship. E.g: prep_new_page+0xa9/0x120 get_page_from_freelist+0x801/0x2210 __alloc_pages+0x18b/0x350 alloc_pages_mpol+0x91/0x1f0 folio_alloc+0x14/0x50 filemap_alloc_folio+0xb2/0x100 __filemap_get_folio+0x14a/0x490 ext4_write_begin+0xbd/0x4b0 [ext4] generic_perform_write+0xc1/0x1e0 ext4_buffered_write_iter+0x68/0xe0 [ext4] ext4_file_write_iter+0x70/0x740 [ext4] vfs_write+0x33d/0x420 ksys_write+0xa5/0xe0 do_syscall_64+0x80/0x160 entry_SYSCALL_64_after_hwframe+0x6e/0x76 stack_count: 4578 In order to show all the stacks, we implement stack_depot_get_next_stack(), which walks all buckets while retrieving the stacks stored in them. stack_depot_get_next_stack() will return all stacks, one at a time, by first finding a non-empty bucket, and then retrieving all the stacks stored in that bucket. Once we have completely gone through it, we get the next non-empty bucket and repeat the same steps, and so on until we have completely checked all buckets. Signed-off-by: Oscar Salvador --- include/linux/stackdepot.h | 20 +++++++++ lib/stackdepot.c | 46 +++++++++++++++++++++ mm/page_owner.c | 85 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 151 insertions(+) diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h index ac62de4d4999..d851ec821e6f 100644 --- a/include/linux/stackdepot.h +++ b/include/linux/stackdepot.h @@ -183,6 +183,26 @@ depot_stack_handle_t stack_depot_save(unsigned long *e= ntries, */ struct stack_record *stack_depot_get_stack(depot_stack_handle_t handle); =20 +/** + * stack_depot_get_next_stack - Returns all stacks, one at a time + * + * @table: Current table we are checking + * @bucket: Current bucket we are checking + * @last_found: Last stack that was found + * + * This function finds first a non-empty bucket and returns the first stack + * stored in it. On consequent calls, it walks the bucket to see whether + * it contains more stacks. + * Once we have walked all the stacks in a bucket, we check + * the next one, and we repeat the same steps until we have checked all of= them + * + * Return: A pointer a to stack_record struct, or NULL when we have walked= all + * buckets. + */ +struct stack_record *stack_depot_get_next_stack(unsigned long *table, + struct list_head **bucket, + struct stack_record **last_found); + /** * stack_depot_fetch - Fetch a stack trace from stack depot * diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 197c355601f9..107bd0174cd6 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -782,6 +782,52 @@ unsigned int stack_depot_get_extra_bits(depot_stack_ha= ndle_t handle) } EXPORT_SYMBOL(stack_depot_get_extra_bits); =20 +struct stack_record *stack_depot_get_next_stack(unsigned long *table, + struct list_head **curr_bucket, + struct stack_record **last_found) +{ + struct list_head *bucket =3D *curr_bucket; + unsigned long nr_table =3D *table; + struct stack_record *found =3D NULL; + unsigned long stack_table_entries =3D stack_hash_mask + 1; + + rcu_read_lock_sched_notrace(); + if (!bucket) { + /* + * Find a non-empty bucket. Once we have found it, + * we will use list_for_each_entry_continue_rcu() on the next + * call to keep walking the bucket. + */ +new_table: + bucket =3D &stack_table[nr_table]; + list_for_each_entry_rcu(found, bucket, hash_list) { + goto out; + } + } else { + /* Check whether we have more stacks in this bucket */ + found =3D *last_found; + list_for_each_entry_continue_rcu(found, bucket, hash_list) { + goto out; + } + } + + /* No more stacks in this bucket, check the next one */ + nr_table++; + if (nr_table < stack_table_entries) + goto new_table; + + /* We are done walking all buckets */ + found =3D NULL; + +out: + *table =3D nr_table; + *curr_bucket =3D bucket; + *last_found =3D found; + rcu_read_unlock_sched_notrace(); + + return found; +} + static int stats_show(struct seq_file *seq, void *v) { /* diff --git a/mm/page_owner.c b/mm/page_owner.c index 0adf41702b9d..aea212734557 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -749,6 +749,89 @@ static const struct file_operations proc_page_owner_op= erations =3D { .llseek =3D lseek_page_owner, }; =20 +struct stack_iterator { + unsigned long nr_table; + struct list_head *bucket; + struct stack_record *last_stack; +}; + +static void *stack_start(struct seq_file *m, loff_t *ppos) +{ + struct stack_iterator *iter =3D m->private; + + if (*ppos =3D=3D -1UL) + return NULL; + + return stack_depot_get_next_stack(&iter->nr_table, + &iter->bucket, + &iter->last_stack); +} + +static void *stack_next(struct seq_file *m, void *v, loff_t *ppos) +{ + struct stack_iterator *iter =3D m->private; + struct stack_record *stack; + + stack =3D stack_depot_get_next_stack(&iter->nr_table, + &iter->bucket, + &iter->last_stack); + *ppos =3D stack ? *ppos + 1 : -1UL; + + return stack; +} + +static int stack_print(struct seq_file *m, void *v) +{ + char *buf; + int ret =3D 0; + struct stack_iterator *iter =3D m->private; + struct stack_record *stack =3D iter->last_stack; + + if (!stack->size || stack->size < 0 || refcount_read(&stack->count) < 2) + return 0; + + buf =3D kzalloc(PAGE_SIZE, GFP_KERNEL); + + ret +=3D stack_trace_snprint(buf, PAGE_SIZE, stack->entries, stack->size, + 0); + if (!ret) + goto out; + + scnprintf(buf + ret, PAGE_SIZE - ret, "stack_count: %d\n\n", + refcount_read(&stack->count)); + + seq_printf(m, buf); + seq_puts(m, "\n\n"); +out: + kfree(buf); + + return 0; +} + +static void stack_stop(struct seq_file *m, void *v) +{ +} + +static const struct seq_operations page_owner_stack_op =3D { + .start =3D stack_start, + .next =3D stack_next, + .stop =3D stack_stop, + .show =3D stack_print +}; + +static int page_owner_stack_open(struct inode *inode, struct file *file) +{ + return seq_open_private(file, &page_owner_stack_op, + sizeof(struct stack_iterator)); +} + +const struct file_operations page_owner_stack_operations =3D { + .open =3D page_owner_stack_open, + .read =3D seq_read, + .llseek =3D seq_lseek, + .release =3D seq_release, +}; + static int __init pageowner_init(void) { if (!static_branch_unlikely(&page_owner_inited)) { @@ -758,6 +841,8 @@ static int __init pageowner_init(void) =20 debugfs_create_file("page_owner", 0400, NULL, NULL, &proc_page_owner_operations); 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dkim=pass header.d=suse.de header.s=susede2_rsa header.b=ICG5MFU6; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=QnlWa4ie X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [3.49 / 50.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; R_MISSING_CHARSET(2.50)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[suse.de:+]; MX_GOOD(-0.01)[]; RCPT_COUNT_SEVEN(0.00)[9]; NEURAL_HAM_SHORT(-0.20)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; BAYES_HAM(-0.00)[17.25%]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; NEURAL_HAM_LONG(-1.00)[-1.000]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FREEMAIL_CC(0.00)[vger.kernel.org,kvack.org,suse.com,suse.cz,google.com,gmail.com,suse.de]; RCVD_TLS_ALL(0.00)[] X-Spam-Score: 3.49 X-Rspamd-Queue-Id: 56E6F1F7AB X-Spam-Flag: NO Content-Type: text/plain; charset="utf-8" We want to be able to filter out the stacks based on a threshold we can tune. By writing to 'page_owner_threshold' file, we can adjust the threshold value. Signed-off-by: Oscar Salvador --- mm/page_owner.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index aea212734557..d95a73cf2581 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -780,14 +780,18 @@ static void *stack_next(struct seq_file *m, void *v, = loff_t *ppos) return stack; } =20 +static unsigned long page_owner_stack_threshold; + static int stack_print(struct seq_file *m, void *v) { char *buf; int ret =3D 0; struct stack_iterator *iter =3D m->private; struct stack_record *stack =3D iter->last_stack; + int stack_count =3D refcount_read(&stack->count); =20 - if (!stack->size || stack->size < 0 || refcount_read(&stack->count) < 2) + if (!stack->size || stack->size < 0 || stack_count < 2 || + stack_count < page_owner_stack_threshold) return 0; =20 buf =3D kzalloc(PAGE_SIZE, GFP_KERNEL); @@ -832,6 +836,21 @@ const struct file_operations page_owner_stack_operatio= ns =3D { .release =3D seq_release, }; =20 +static int page_owner_threshold_get(void *data, u64 *val) +{ + *val =3D page_owner_stack_threshold; + return 0; +} + +static int page_owner_threshold_set(void *data, u64 val) +{ + page_owner_stack_threshold =3D val; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(proc_page_owner_threshold, &page_owner_threshold_g= et, + &page_owner_threshold_set, "%llu"); + static int __init pageowner_init(void) { if (!static_branch_unlikely(&page_owner_inited)) { @@ -843,6 +862,8 @@ static int __init pageowner_init(void) &proc_page_owner_operations); debugfs_create_file("page_owner_stacks", 0400, NULL, NULL, &page_owner_stack_operations); + debugfs_create_file("page_owner_threshold", 0600, NULL, NULL, + &proc_page_owner_threshold); =20 return 0; } --=20 2.43.0