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Thu, 8 Feb 2024 23:45:16 +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 KDmJLoxnxWWUfAAAD6G6ig (envelope-from ); Thu, 08 Feb 2024 23:45:16 +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 4/4] mm,page_owner: Filter out stacks by a threshold Date: Fri, 9 Feb 2024 00:45:39 +0100 Message-ID: <20240208234539.19113-5-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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Bar: +++ X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 610A740004 X-Stat-Signature: 8anhx5mmwtp557teeab77otkd9fd966m X-HE-Tag: 1707435919-478105 X-HE-Meta: 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 fT42u27A M0q3Y7Az2oWNCKnZiUi0SpoSKNx3H5HdpqHDHAE5JuP2HNHXShyW8rPndnEjiwUTdgc2v2DWiLeYVRk7An3ggai66jxiHkYca4N+A/HUbBK3hkV6P9mmxhTeW6t+foTCK1CufeqtWIWWh8MBWCkzpKsIW5LzFUl7V3MCH/NdHs4oGn/lZSl6hvryrYcKoaFieMpOSYf5sosxWNQPWkhHW3Id1JBfLpbJ06mz6rLAHgYjLFhY9WjfGLWIEm2stJR/NcpGLPJ89nFu5mHS8pebQPrORcBj6PNq7lhnBRw/SlFaaUGkrBZt4TlfCbQ== 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: List-Subscribe: List-Unsubscribe: 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; } +static unsigned long page_owner_stack_threshold; + static int stack_print(struct seq_file *m, void *v) { char *buf; int ret = 0; struct stack_iterator *iter = m->private; struct stack_record *stack = iter->last_stack; + int stack_count = refcount_read(&stack->count); - 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; buf = kzalloc(PAGE_SIZE, GFP_KERNEL); @@ -832,6 +836,21 @@ const struct file_operations page_owner_stack_operations = { .release = seq_release, }; +static int page_owner_threshold_get(void *data, u64 *val) +{ + *val = page_owner_stack_threshold; + return 0; +} + +static int page_owner_threshold_set(void *data, u64 val) +{ + page_owner_stack_threshold = val; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(proc_page_owner_threshold, &page_owner_threshold_get, + &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); return 0; } -- 2.43.0