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mm/damon/sysfs-schemes: decouple from damos_action

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Decouple DAMOS sysfs interface from damos_action.  For this, define and
use new sysfs-schemes internal data structure that maps the user-space
keywords and damos_action, instead of having the implicit and unflexible
array index rule.

[akpm@linux-foundation.org: make damos_sysfs_action_names static]
  Closes: https://lore.kernel.org/oe-kbuild-all/202506271655.b8yfEZIT-lkp@intel.com/
Link: https://lkml.kernel.org/r/20250622213759.50930-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2025-06-22 14:37:56 -07:00
committed by Andrew Morton
parent b7482f91ea
commit 2bbf41ee98
1 changed files with 62 additions and 18 deletions
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80
mm/damon/sysfs-schemes.c
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@@ -1614,18 +1614,52 @@ struct damon_sysfs_scheme {
int target_nid;
};
/* This should match with enum damos_action */
static const char * const damon_sysfs_damos_action_strs[] = {
"willneed",
"cold",
"pageout",
"hugepage",
"nohugepage",
"lru_prio",
"lru_deprio",
"migrate_hot",
"migrate_cold",
"stat",
struct damos_sysfs_action_name {
enum damos_action action;
char *name;
};
static struct damos_sysfs_action_name damos_sysfs_action_names[] = {
{
.action = DAMOS_WILLNEED,
.name = "willneed",
},
{
.action = DAMOS_COLD,
.name = "cold",
},
{
.action = DAMOS_PAGEOUT,
.name = "pageout",
},
{
.action = DAMOS_HUGEPAGE,
.name = "hugepage",
},
{
.action = DAMOS_NOHUGEPAGE,
.name = "nohugepage",
},
{
.action = DAMOS_LRU_PRIO,
.name = "lru_prio",
},
{
.action = DAMOS_LRU_DEPRIO,
.name = "lru_deprio",
},
{
.action = DAMOS_MIGRATE_HOT,
.name = "migrate_hot",
},
{
.action = DAMOS_MIGRATE_COLD,
.name = "migrate_cold",
},
{
.action = DAMOS_STAT,
.name = "stat",
},
};
static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc(
@@ -1862,9 +1896,16 @@ static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr,
{
struct damon_sysfs_scheme *scheme = container_of(kobj,
struct damon_sysfs_scheme, kobj);
int i;
return sysfs_emit(buf, "%s\n",
damon_sysfs_damos_action_strs[scheme->action]);
for (i = 0; i < ARRAY_SIZE(damos_sysfs_action_names); i++) {
struct damos_sysfs_action_name *action_name;
action_name = &damos_sysfs_action_names[i];
if (action_name->action == scheme->action)
return sysfs_emit(buf, "%s\n", action_name->name);
}
return -EINVAL;
}
static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -1872,11 +1913,14 @@ static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr,
{
struct damon_sysfs_scheme *scheme = container_of(kobj,
struct damon_sysfs_scheme, kobj);
enum damos_action action;
int i;
for (action = 0; action < NR_DAMOS_ACTIONS; action++) {
if (sysfs_streq(buf, damon_sysfs_damos_action_strs[action])) {
scheme->action = action;
for (i = 0; i < ARRAY_SIZE(damos_sysfs_action_names); i++) {
struct damos_sysfs_action_name *action_name;
action_name = &damos_sysfs_action_names[i];
if (sysfs_streq(buf, action_name->name)) {
scheme->action = action_name->action;
return count;
}
}