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mm/damon/sysfs-schemes: support DAMOS apply interval

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Update DAMON sysfs interface to support DAMOS apply intervals by adding a
new file, 'apply_interval_us' in each scheme directory.  Users can set and
get the interval for each scheme in microseconds by writing to and reading
from the file.

Link: https://lkml.kernel.org/r/20230916020945.47296-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2023-09-16 02:09:42 +00:00
committed by Andrew Morton
parent 3f8723f129
commit a2a9f68e35
1 changed files with 34 additions and 4 deletions
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mm/damon/sysfs-schemes.c
+34 -4
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@@ -1121,6 +1121,7 @@ struct damon_sysfs_scheme {
struct kobject kobj;
enum damos_action action;
struct damon_sysfs_access_pattern *access_pattern;
unsigned long apply_interval_us;
struct damon_sysfs_quotas *quotas;
struct damon_sysfs_watermarks *watermarks;
struct damon_sysfs_scheme_filters *filters;
@@ -1141,7 +1142,7 @@ static const char * const damon_sysfs_damos_action_strs[] = {
};
static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc(
enum damos_action action)
enum damos_action action, unsigned long apply_interval_us)
{
struct damon_sysfs_scheme *scheme = kmalloc(sizeof(*scheme),
GFP_KERNEL);
@@ -1150,6 +1151,7 @@ static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc(
return NULL;
scheme->kobj = (struct kobject){};
scheme->action = action;
scheme->apply_interval_us = apply_interval_us;
return scheme;
}
@@ -1353,6 +1355,25 @@ static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr,
return -EINVAL;
}
static ssize_t apply_interval_us_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct damon_sysfs_scheme *scheme = container_of(kobj,
struct damon_sysfs_scheme, kobj);
return sysfs_emit(buf, "%lu\n", scheme->apply_interval_us);
}
static ssize_t apply_interval_us_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
struct damon_sysfs_scheme *scheme = container_of(kobj,
struct damon_sysfs_scheme, kobj);
int err = kstrtoul(buf, 0, &scheme->apply_interval_us);
return err ? err : count;
}
static void damon_sysfs_scheme_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_scheme, kobj));
@@ -1361,8 +1382,12 @@ static void damon_sysfs_scheme_release(struct kobject *kobj)
static struct kobj_attribute damon_sysfs_scheme_action_attr =
__ATTR_RW_MODE(action, 0600);
static struct kobj_attribute damon_sysfs_scheme_apply_interval_us_attr =
__ATTR_RW_MODE(apply_interval_us, 0600);
static struct attribute *damon_sysfs_scheme_attrs[] = {
&damon_sysfs_scheme_action_attr.attr,
&damon_sysfs_scheme_apply_interval_us_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_scheme);
@@ -1413,7 +1438,11 @@ static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes,
schemes->schemes_arr = schemes_arr;
for (i = 0; i < nr_schemes; i++) {
scheme = damon_sysfs_scheme_alloc(DAMOS_STAT);
/*
* apply_interval_us as 0 means same to aggregation interval
* (same to before-apply_interval behavior)
*/
scheme = damon_sysfs_scheme_alloc(DAMOS_STAT, 0);
if (!scheme) {
damon_sysfs_schemes_rm_dirs(schemes);
return -ENOMEM;
@@ -1610,8 +1639,8 @@ static struct damos *damon_sysfs_mk_scheme(
.low = sysfs_wmarks->low,
};
scheme = damon_new_scheme(&pattern, sysfs_scheme->action, 0, &quota,
&wmarks);
scheme = damon_new_scheme(&pattern, sysfs_scheme->action,
sysfs_scheme->apply_interval_us, &quota, &wmarks);
if (!scheme)
return NULL;
@@ -1641,6 +1670,7 @@ static void damon_sysfs_update_scheme(struct damos *scheme,
scheme->pattern.max_age_region = access_pattern->age->max;
scheme->action = sysfs_scheme->action;
scheme->apply_interval_us = sysfs_scheme->apply_interval_us;
scheme->quota.ms = sysfs_quotas->ms;
scheme->quota.sz = sysfs_quotas->sz;