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
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------------------------------------------------------
From: Oscar Salvador <osalvador@xxxxxxx>
Subject: mm,page_owner: filter out stacks by a threshold
Date: Mon, 12 Feb 2024 23:30:28 +0100
We want to be able to filter out the stacks based on a threshold we can
can tune. By writing to 'set_threshold' file, we can adjust the threshold
value.
Link: https://lkml.kernel.org/r/20240212223029.30769-5-osalvador@xxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_owner.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
--- a/mm/page_owner.c~mmpage_owner-filter-out-stacks-by-a-threshold
+++ a/mm/page_owner.c
@@ -832,15 +832,18 @@ 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)
{
char *buf;
int ret = 0;
struct stack *stack = v;
struct stack_record *stack_record = stack->stack_record;
+ int stack_count = refcount_read(&stack_record->count);
if (!stack_record->size || stack_record->size < 0 ||
- refcount_read(&stack_record->count) < 2)
+ stack_count < 2 || stack_count < page_owner_stack_threshold)
return 0;
buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
@@ -851,7 +854,7 @@ static int stack_print(struct seq_file *
goto out;
scnprintf(buf + ret, PAGE_SIZE - ret, "stack_count: %d\n\n",
- refcount_read(&stack_record->count));
+ stack_count);
seq_printf(m, buf);
seq_puts(m, "\n\n");
@@ -884,6 +887,21 @@ static const struct file_operations page
.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)
{
struct dentry *dir;
@@ -898,6 +916,8 @@ 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("set_threshold", 0600, dir, NULL,
+ &proc_page_owner_threshold);
return 0;
}
_
Patches currently in -mm which might be from osalvador@xxxxxxx are
lib-stackdepot-move-stack_record-struct-definition-into-the-header.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
