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mm,page_owner: filter out stacks by a threshold

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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>
This commit is contained in:
Oscar Salvador 2024-02-15 22:59:06 +01:00 committed by Andrew Morton
parent 765973a098
commit 05bb6f4e82
1 changed files with 22 additions and 1 deletions
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23
mm/page_owner.c
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@ -846,6 +846,8 @@ static void *stack_next(struct seq_file *m, void *v, loff_t *ppos)
return stack; return stack;
} }
static unsigned long page_owner_stack_threshold;
static int stack_print(struct seq_file *m, void *v) static int stack_print(struct seq_file *m, void *v)
{ {
int i, stack_count; int i, stack_count;
@ -858,7 +860,8 @@ static int stack_print(struct seq_file *m, void *v)
entries = stack_record->entries; entries = stack_record->entries;
stack_count = refcount_read(&stack_record->count) - 1; 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; return 0;
for (i = 0; i < nr_entries; i++) for (i = 0; i < nr_entries; i++)
@ -891,6 +894,22 @@ static const struct file_operations page_owner_stack_operations = {
.release = seq_release, .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) static int __init pageowner_init(void)
{ {
struct dentry *dir; struct dentry *dir;
@ -905,6 +924,8 @@ static int __init pageowner_init(void)
dir = debugfs_create_dir("page_owner_stacks", NULL); dir = debugfs_create_dir("page_owner_stacks", NULL);
debugfs_create_file("show_stacks", 0400, dir, NULL, debugfs_create_file("show_stacks", 0400, dir, NULL,
&page_owner_stack_operations); &page_owner_stack_operations);
debugfs_create_file("count_threshold", 0600, dir, NULL,
&proc_page_owner_threshold);
return 0; return 0;
} }