The patch titled
Subject: mm,page_owner: filter out stacks by a threshold
has been added to the -mm mm-unstable branch. Its filename is
mmpage_owner-filter-out-stacks-by-a-threshold.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mmpage_owner-filter-out-stacks-by-a-threshold.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Oscar Salvador <osalvador@xxxxxxx>
Subject: mm,page_owner: filter out stacks by a threshold
Date: Thu, 15 Feb 2024 22:59:06 +0100
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@xxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_owner.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
--- a/mm/page_owner.c~mmpage_owner-filter-out-stacks-by-a-threshold
+++ a/mm/page_owner.c
@@ -846,6 +846,8 @@ static void *stack_next(struct seq_file
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 *
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
.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;
}
_
Patches currently in -mm which might be from osalvador@xxxxxxx are
lib-stackdepot-fix-first-entry-having-a-0-handle.patch
lib-stackdepot-move-stack_record-struct-definition-into-the-header.patch
mmpage_owner-maintain-own-list-of-stack_records-structs.patch
mmpage_owner-implement-the-tracking-of-the-stacks-count.patch
mmpage_owner-display-all-stacks-and-their-count.patch
mmpage_owner-filter-out-stacks-by-a-threshold.patch
mmpage_owner-update-documentation-regarding-page_owner_stacks.patch
