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mm/damon/sysfs-schemes: implement probe dir

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Implement sysfs directory for showing per-probe hits count of each region.

Link: https://lore.kernel.org/20260518234119.97569-17-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-05-18 16:41:04 -07:00 committed by Andrew Morton
parent b574a82d10
commit a1536db4dc
1 changed files with 95 additions and 6 deletions
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101
mm/damon/sysfs-schemes.c
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@ -10,12 +10,40 @@
#include "sysfs-common.h"
/*
* probe directory
*/
struct damos_sysfs_probe {
struct kobject kobj;
};
static struct damos_sysfs_probe *damos_sysfs_probe_alloc(void)
{
return kzalloc_obj(struct damos_sysfs_probe);
}
static void damos_sysfs_probe_release(struct kobject *kobj)
{
struct damos_sysfs_probe *probe = container_of(kobj,
struct damos_sysfs_probe, kobj);
kfree(probe);
}
static const struct kobj_type damos_sysfs_probe_ktype = {
.release = damos_sysfs_probe_release,
.sysfs_ops = &kobj_sysfs_ops,
};
/*
* probes directory
*/
struct damos_sysfs_probes {
struct kobject kobj;
struct damos_sysfs_probe **probes_arr;
int nr;
};
static struct damos_sysfs_probes *damos_sysfs_probes_alloc(void)
@ -23,6 +51,60 @@ static struct damos_sysfs_probes *damos_sysfs_probes_alloc(void)
return kzalloc_obj(struct damos_sysfs_probes);
}
static void damos_sysfs_probes_rm_dirs(struct damos_sysfs_probes *probes)
{
struct damos_sysfs_probe **probes_arr = probes->probes_arr;
int i;
for (i = 0; i < probes->nr; i++)
kobject_put(&probes_arr[i]->kobj);
probes->nr = 0;
kfree(probes_arr);
probes->probes_arr = NULL;
}
static int damos_sysfs_probes_add_dirs(struct damos_sysfs_probes *probes,
struct damon_ctx *ctx)
{
struct damon_probe *probe;
struct damos_sysfs_probe **probes_arr;
int i = 0;
damon_for_each_probe(probe, ctx)
i++;
if (!i)
return 0;
probes_arr = kmalloc_objs(*probes_arr, i);
if (!probes_arr)
return -ENOMEM;
probes->probes_arr = probes_arr;
i = 0;
damon_for_each_probe(probe, ctx) {
struct damos_sysfs_probe *sys_probe;
int err;
sys_probe = damos_sysfs_probe_alloc();
if (!sys_probe) {
damos_sysfs_probes_rm_dirs(probes);
return -ENOMEM;
}
err = kobject_init_and_add(&sys_probe->kobj,
&damos_sysfs_probe_ktype, &probes->kobj, "%d",
i);
if (err) {
kobject_put(&sys_probe->kobj);
damos_sysfs_probes_rm_dirs(probes);
return err;
}
probes_arr[i++] = sys_probe;
probes->nr++;
}
return 0;
}
static void damos_sysfs_probes_release(struct kobject *kobj)
{
struct damos_sysfs_probes *probes = container_of(kobj,
@ -67,7 +149,8 @@ static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc(
}
static int damos_sysfs_region_add_dirs(
struct damon_sysfs_scheme_region *region)
struct damon_sysfs_scheme_region *region,
struct damon_ctx *ctx)
{
struct damos_sysfs_probes *probes = damos_sysfs_probes_alloc();
int err;
@ -76,18 +159,24 @@ static int damos_sysfs_region_add_dirs(
return -ENOMEM;
err = kobject_init_and_add(&probes->kobj, &damos_sysfs_probes_ktype,
&region->kobj, "probes");
if (err) {
kobject_put(&probes->kobj);
return err;
}
if (err)
goto fail;
err = damos_sysfs_probes_add_dirs(probes, ctx);
if (err)
goto fail;
region->probes = probes;
return 0;
fail:
kobject_put(&probes->kobj);
return err;
}
static void damos_sysfs_region_rm_dirs(
struct damon_sysfs_scheme_region *region)
{
damos_sysfs_probes_rm_dirs(region->probes);
kobject_put(&region->probes->kobj);
}
@ -3051,7 +3140,7 @@ void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes,
&sysfs_regions->kobj, "%d",
sysfs_regions->nr_regions))
goto out;
if (damos_sysfs_region_add_dirs(region))
if (damos_sysfs_region_add_dirs(region, ctx))
goto out;
list_add_tail(&region->list, &sysfs_regions->regions_list);