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mm/damon/sysfs-schemes: add a file for setting damos_filter->allow

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Only kernel-space DAMON API users can use inclusive DAMOS filters.  Add a
sysfs file named 'allow' under DAMOS filter directory of DAMON sysfs
interface, to let the user-space users use inclusive DAMOS filters.

Link: https://lkml.kernel.org/r/20250109175126.57878-7-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 2025-01-09 09:51:22 -08:00 committed by Andrew Morton
parent e2fbfedad0
commit faa636c0ec
1 changed files with 31 additions and 1 deletions
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32
mm/damon/sysfs-schemes.c
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@ -313,6 +313,7 @@ struct damon_sysfs_scheme_filter {
struct kobject kobj;
enum damos_filter_type type;
bool matching;
bool allow;
char *memcg_path;
struct damon_addr_range addr_range;
int target_idx;
@ -385,6 +386,30 @@ static ssize_t matching_store(struct kobject *kobj,
return count;
}
static ssize_t allow_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct damon_sysfs_scheme_filter *filter = container_of(kobj,
struct damon_sysfs_scheme_filter, kobj);
return sysfs_emit(buf, "%c\n", filter->allow ? 'Y' : 'N');
}
static ssize_t allow_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
struct damon_sysfs_scheme_filter *filter = container_of(kobj,
struct damon_sysfs_scheme_filter, kobj);
bool allow;
int err = kstrtobool(buf, &allow);
if (err)
return err;
filter->allow = allow;
return count;
}
static ssize_t memcg_path_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@ -482,6 +507,9 @@ static struct kobj_attribute damon_sysfs_scheme_filter_type_attr =
static struct kobj_attribute damon_sysfs_scheme_filter_matching_attr =
__ATTR_RW_MODE(matching, 0600);
static struct kobj_attribute damon_sysfs_scheme_filter_allow_attr =
__ATTR_RW_MODE(allow, 0600);
static struct kobj_attribute damon_sysfs_scheme_filter_memcg_path_attr =
__ATTR_RW_MODE(memcg_path, 0600);
@ -497,6 +525,7 @@ static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr =
static struct attribute *damon_sysfs_scheme_filter_attrs[] = {
&damon_sysfs_scheme_filter_type_attr.attr,
&damon_sysfs_scheme_filter_matching_attr.attr,
&damon_sysfs_scheme_filter_allow_attr.attr,
&damon_sysfs_scheme_filter_memcg_path_attr.attr,
&damon_sysfs_scheme_filter_addr_start_attr.attr,
&damon_sysfs_scheme_filter_addr_end_attr.attr,
@ -1901,7 +1930,8 @@ static int damon_sysfs_add_scheme_filters(struct damos *scheme,
sysfs_filters->filters_arr[i];
struct damos_filter *filter =
damos_new_filter(sysfs_filter->type,
sysfs_filter->matching, false);
sysfs_filter->matching,
sysfs_filter->allow);
int err;
if (!filter)