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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 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790377897318330915 X-GMAIL-MSGID: 1790377897318330915 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; }