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mm/damon/sysfs-schemes: expose per-region filter-passed bytes

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Per-region operations set-handled DAMOS filters passed memory size
information is provided to only DAMON core API users.  Further expose it
to the user space by adding a new DAMON sysfs interface file under each
scheme tried region directory.

Link: https://lkml.kernel.org/r/20250106193401.109161-14-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2025-01-06 11:33:58 -08:00 committed by Andrew Morton
parent cfc33a7d2d
commit a2a60f9e57
3 changed files with 21 additions and 3 deletions
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2
mm/damon/sysfs-common.h
View File

@ -48,7 +48,7 @@ void damon_sysfs_schemes_update_stats(
void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes,
struct damon_ctx *ctx, struct damon_target *t,
struct damon_region *r, struct damos *s,
bool total_bytes_only);
bool total_bytes_only, unsigned long sz_filter_passed);
int damon_sysfs_schemes_clear_regions(
struct damon_sysfs_schemes *sysfs_schemes);

19
mm/damon/sysfs-schemes.c
View File

@ -19,6 +19,7 @@ struct damon_sysfs_scheme_region {
struct damon_addr_range ar;
unsigned int nr_accesses;
unsigned int age;
unsigned long sz_filter_passed;
struct list_head list;
};
@ -74,6 +75,15 @@ static ssize_t age_show(struct kobject *kobj, struct kobj_attribute *attr,
return sysfs_emit(buf, "%u\n", region->age);
}
static ssize_t sz_filter_passed_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct damon_sysfs_scheme_region *region = container_of(kobj,
struct damon_sysfs_scheme_region, kobj);
return sysfs_emit(buf, "%lu\n", region->sz_filter_passed);
}
static void damon_sysfs_scheme_region_release(struct kobject *kobj)
{
struct damon_sysfs_scheme_region *region = container_of(kobj,
@ -95,11 +105,15 @@ static struct kobj_attribute damon_sysfs_scheme_region_nr_accesses_attr =
static struct kobj_attribute damon_sysfs_scheme_region_age_attr =
__ATTR_RO_MODE(age, 0400);
static struct kobj_attribute damon_sysfs_scheme_region_sz_filter_passed_attr =
__ATTR_RO_MODE(sz_filter_passed, 0400);
static struct attribute *damon_sysfs_scheme_region_attrs[] = {
&damon_sysfs_scheme_region_start_attr.attr,
&damon_sysfs_scheme_region_end_attr.attr,
&damon_sysfs_scheme_region_nr_accesses_attr.attr,
&damon_sysfs_scheme_region_age_attr.attr,
&damon_sysfs_scheme_region_sz_filter_passed_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_scheme_region);
@ -2105,12 +2119,14 @@ void damon_sysfs_schemes_update_stats(
* @r: DAMON region to populate the directory for.
* @s: Corresponding scheme.
* @total_bytes_only: Whether the request is for bytes update only.
* @sz_filter_passed: Bytes of @r that passed filters of @s.
*
* Called from DAMOS walk callback while holding damon_sysfs_lock.
*/
void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes,
struct damon_ctx *ctx, struct damon_target *t,
struct damon_region *r, struct damos *s, bool total_bytes_only)
struct damon_region *r, struct damos *s, bool total_bytes_only,
unsigned long sz_filter_passed)
{
struct damos *scheme;
struct damon_sysfs_scheme_regions *sysfs_regions;
@ -2135,6 +2151,7 @@ void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes,
region = damon_sysfs_scheme_region_alloc(r);
if (!region)
return;
region->sz_filter_passed = sz_filter_passed;
list_add_tail(&region->list, &sysfs_regions->regions_list);
sysfs_regions->nr_regions++;
if (kobject_init_and_add(&region->kobj,

3
mm/damon/sysfs.c
View File

@ -1461,7 +1461,8 @@ static void damon_sysfs_schemes_tried_regions_upd_one(void *data, struct damon_c
damos_sysfs_populate_region_dir(
sysfs_kdamond->contexts->contexts_arr[0]->schemes,
ctx, t, r, s, walk_data->total_bytes_only);
ctx, t, r, s, walk_data->total_bytes_only,
sz_filter_passed);
}
static int damon_sysfs_update_schemes_tried_regions(