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mm/damon/sysfs: add pause file under context dir

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Add pause DAMON sysfs file under the context directory.  It exposes the
damon_ctx->pause API parameter to the users so that they can use the
pause/resume feature.

Link: https://lore.kernel.org/20260427151231.113429-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
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: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.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 2026-04-27 08:12:21 -07:00 committed by Andrew Morton
parent 3b9e3cc040
commit 3375284944
1 changed files with 31 additions and 0 deletions
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31
mm/damon/sysfs.c
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@ -866,6 +866,7 @@ struct damon_sysfs_context {
struct damon_sysfs_attrs *attrs;
struct damon_sysfs_targets *targets;
struct damon_sysfs_schemes *schemes;
bool pause;
};
static struct damon_sysfs_context *damon_sysfs_context_alloc(
@ -878,6 +879,7 @@ static struct damon_sysfs_context *damon_sysfs_context_alloc(
context->kobj = (struct kobject){};
context->ops_id = ops_id;
context->addr_unit = 1;
context->pause = false;
return context;
}
@ -1053,6 +1055,30 @@ static ssize_t addr_unit_store(struct kobject *kobj,
return count;
}
static ssize_t pause_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct damon_sysfs_context *context = container_of(kobj,
struct damon_sysfs_context, kobj);
return sysfs_emit(buf, "%c\n", context->pause ? 'Y' : 'N');
}
static ssize_t pause_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct damon_sysfs_context *context = container_of(kobj,
struct damon_sysfs_context, kobj);
bool pause;
int err = kstrtobool(buf, &pause);
if (err)
return err;
context->pause = pause;
return count;
}
static void damon_sysfs_context_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_context, kobj));
@ -1067,10 +1093,14 @@ static struct kobj_attribute damon_sysfs_context_operations_attr =
static struct kobj_attribute damon_sysfs_context_addr_unit_attr =
__ATTR_RW_MODE(addr_unit, 0600);
static struct kobj_attribute damon_sysfs_context_pause_attr =
__ATTR_RW_MODE(pause, 0600);
static struct attribute *damon_sysfs_context_attrs[] = {
&damon_sysfs_context_avail_operations_attr.attr,
&damon_sysfs_context_operations_attr.attr,
&damon_sysfs_context_addr_unit_attr.attr,
&damon_sysfs_context_pause_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_context);
@ -1470,6 +1500,7 @@ static int damon_sysfs_apply_inputs(struct damon_ctx *ctx,
if (sys_ctx->ops_id == DAMON_OPS_PADDR)
ctx->min_region_sz = max(
DAMON_MIN_REGION_SZ / sys_ctx->addr_unit, 1);
ctx->pause = sys_ctx->pause;
err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs);
if (err)
return err;