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mm/damon/sysfs-schemes: implement scheme region directory

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Implement region directories under 'tried_regions' directory of each
scheme DAMON sysfs directory.  This directory will provide the address
range, the monitored access frequency ('nr_accesses'), and the age of each
DAMON region that corresponding DAMON-based operation scheme has tried to
be applied.  Note that this commit doesn't implement the code for filling
the data but only the sysfs directory.

Link: https://lkml.kernel.org/r/20221101220328.95765-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2022-11-01 22:03:23 +00:00 • committed by Andrew Morton
parent 5181b75f43
commit 9277d0367b
1 changed files with 122 additions and 1 deletions
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123
mm/damon/sysfs-schemes.c
View file

@ -9,18 +9,138 @@
#include "sysfs-common.h"
/*
* scheme region directory
*/
struct damon_sysfs_scheme_region {
struct kobject kobj;
struct damon_addr_range ar;
unsigned int nr_accesses;
unsigned int age;
struct list_head list;
};
static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc(
struct damon_region *region)
{
struct damon_sysfs_scheme_region *sysfs_region = kmalloc(
sizeof(*sysfs_region), GFP_KERNEL);
if (!sysfs_region)
return NULL;
sysfs_region->kobj = (struct kobject){};
sysfs_region->ar = region->ar;
sysfs_region->nr_accesses = region->nr_accesses;
sysfs_region->age = region->age;
INIT_LIST_HEAD(&sysfs_region->list);
return sysfs_region;
}
static ssize_t start_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->ar.start);
}
static ssize_t end_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->ar.end);
}
static ssize_t nr_accesses_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, "%u\n", region->nr_accesses);
}
static ssize_t age_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, "%u\n", region->age);
}
static void damon_sysfs_scheme_region_release(struct kobject *kobj)
{
struct damon_sysfs_scheme_region *region = container_of(kobj,
struct damon_sysfs_scheme_region, kobj);
list_del(&region->list);
kfree(region);
}
static struct kobj_attribute damon_sysfs_scheme_region_start_attr =
__ATTR_RO_MODE(start, 0400);
static struct kobj_attribute damon_sysfs_scheme_region_end_attr =
__ATTR_RO_MODE(end, 0400);
static struct kobj_attribute damon_sysfs_scheme_region_nr_accesses_attr =
__ATTR_RO_MODE(nr_accesses, 0400);
static struct kobj_attribute damon_sysfs_scheme_region_age_attr =
__ATTR_RO_MODE(age, 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,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_scheme_region);
static struct kobj_type damon_sysfs_scheme_region_ktype = {
.release = damon_sysfs_scheme_region_release,
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = damon_sysfs_scheme_region_groups,
};
/*
* scheme regions directory
*/
struct damon_sysfs_scheme_regions {
struct kobject kobj;
struct list_head regions_list;
int nr_regions;
};
static struct damon_sysfs_scheme_regions *
damon_sysfs_scheme_regions_alloc(void)
{
return kzalloc(sizeof(struct damon_sysfs_scheme_regions), GFP_KERNEL);
struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions),
GFP_KERNEL);
regions->kobj = (struct kobject){};
INIT_LIST_HEAD(&regions->regions_list);
regions->nr_regions = 0;
return regions;
}
static void damon_sysfs_scheme_regions_rm_dirs(
struct damon_sysfs_scheme_regions *regions)
{
struct damon_sysfs_scheme_region *r, *next;
list_for_each_entry_safe(r, next, &regions->regions_list, list) {
/* release function deletes it from the list */
kobject_put(&r->kobj);
regions->nr_regions--;
}
}
static void damon_sysfs_scheme_regions_release(struct kobject *kobj)
@ -837,6 +957,7 @@ static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme)
kobject_put(&scheme->quotas->kobj);
kobject_put(&scheme->watermarks->kobj);
kobject_put(&scheme->stats->kobj);
damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions);
kobject_put(&scheme->tried_regions->kobj);
}