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| author | Oscar Salvador <osalvador@suse.de> | 2024-02-15 22:59:06 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-23 17:48:17 -0800 |
| commit | 05bb6f4e826bc8d02632ff942ee8d34b7be37379 (patch) | |
| tree | 0f33ed0278e70e129e8f1316d85d1ad29625e3f5 /mm | |
| parent | 765973a098037b198ffb813244dbdb45c875ad5f (diff) | |
| download | linux-05bb6f4e826bc8d02632ff942ee8d34b7be37379.tar.gz | |
mm,page_owner: filter out stacks by a threshold
We want to be able to filter out the stacks based on a threshold we can
can tune. By writing to 'count_threshold' file, we can adjust the
threshold value.
Link: https://lkml.kernel.org/r/20240215215907.20121-7-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_owner.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/mm/page_owner.c b/mm/page_owner.c index e99fbf822dd693..e56c1e92eccf5a 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -846,6 +846,8 @@ 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) { int i, stack_count; @@ -858,7 +860,8 @@ static int stack_print(struct seq_file *m, void *v) entries = stack_record->entries; stack_count = refcount_read(&stack_record->count) - 1; - if (!nr_entries || nr_entries < 0 || stack_count < 1) + if (!nr_entries || nr_entries < 0 || stack_count < 1 || + stack_count < page_owner_stack_threshold) return 0; for (i = 0; i < nr_entries; i++) @@ -891,6 +894,22 @@ static const struct file_operations page_owner_stack_operations = { .release = seq_release, }; +static int page_owner_threshold_get(void *data, u64 *val) +{ + *val = READ_ONCE(page_owner_stack_threshold); + return 0; +} + +static int page_owner_threshold_set(void *data, u64 val) +{ + WRITE_ONCE(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) { struct dentry *dir; @@ -905,6 +924,8 @@ static int __init pageowner_init(void) dir = debugfs_create_dir("page_owner_stacks", NULL); debugfs_create_file("show_stacks", 0400, dir, NULL, &page_owner_stack_operations); + debugfs_create_file("count_threshold", 0600, dir, NULL, + &proc_page_owner_threshold); return 0; } |