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authorSeongJae Park <sj@kernel.org>2022-03-22 14:49:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-22 15:57:13 -0700
commit9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990 (patch)
tree617f66ae15133b6c25be9b5911e7862043a3eb8d /mm/damon
parent7e84b1f8212a038ebeee06de56db7181148fa0cd (diff)
mm/damon/sysfs: support DAMOS quotas
This commit makes DAMON sysfs interface supports the DAMOS quotas feature. Specifically, this commit adds 'quotas' directory under each scheme directory and makes kdamond 'state' file writing respects the contents in the directory. As a result, the files hierarchy becomes as below: /sys/kernel/mm/damon/admin │ kdamonds/nr_kdamonds │ │ 0/state,pid │ │ │ contexts/nr_contexts │ │ │ │ 0/operations │ │ │ │ │ monitoring_attrs/intervals/sample_us,aggr_us,update_us │ │ │ │ │ │ nr_regions/min,max │ │ │ │ │ targets/nr_targets │ │ │ │ │ │ 0/pid_target │ │ │ │ │ │ │ regions/nr_regions │ │ │ │ │ │ │ │ 0/start,end │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ │ schemes/nr_schemes │ │ │ │ │ │ 0/action │ │ │ │ │ │ │ access_pattern/ │ │ │ │ │ │ │ │ sz/min,max │ │ │ │ │ │ │ │ nr_accesses/min,max │ │ │ │ │ │ │ │ age/min,max │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms <- NEW DIRECTORY │ │ │ │ │ │ ... │ │ │ │ ... │ │ ... Link: https://lkml.kernel.org/r/20220228081314.5770-8-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Xin Hao <xhao@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/damon')
-rw-r--r--mm/damon/sysfs.c146
1 files changed, 145 insertions, 1 deletions
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 812c3a3b0624..21c2663142b6 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -114,6 +114,113 @@ static struct kobj_type damon_sysfs_ul_range_ktype = {
};
/*
+ * quotas directory
+ */
+
+struct damon_sysfs_quotas {
+ struct kobject kobj;
+ unsigned long ms;
+ unsigned long sz;
+ unsigned long reset_interval_ms;
+};
+
+static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void)
+{
+ return kzalloc(sizeof(struct damon_sysfs_quotas), GFP_KERNEL);
+}
+
+static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ struct damon_sysfs_quotas *quotas = container_of(kobj,
+ struct damon_sysfs_quotas, kobj);
+
+ return sysfs_emit(buf, "%lu\n", quotas->ms);
+}
+
+static ssize_t ms_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct damon_sysfs_quotas *quotas = container_of(kobj,
+ struct damon_sysfs_quotas, kobj);
+ int err = kstrtoul(buf, 0, &quotas->ms);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t bytes_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ struct damon_sysfs_quotas *quotas = container_of(kobj,
+ struct damon_sysfs_quotas, kobj);
+
+ return sysfs_emit(buf, "%lu\n", quotas->sz);
+}
+
+static ssize_t bytes_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_quotas *quotas = container_of(kobj,
+ struct damon_sysfs_quotas, kobj);
+ int err = kstrtoul(buf, 0, &quotas->sz);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t reset_interval_ms_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct damon_sysfs_quotas *quotas = container_of(kobj,
+ struct damon_sysfs_quotas, kobj);
+
+ return sysfs_emit(buf, "%lu\n", quotas->reset_interval_ms);
+}
+
+static ssize_t reset_interval_ms_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_quotas *quotas = container_of(kobj,
+ struct damon_sysfs_quotas, kobj);
+ int err = kstrtoul(buf, 0, &quotas->reset_interval_ms);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+static void damon_sysfs_quotas_release(struct kobject *kobj)
+{
+ kfree(container_of(kobj, struct damon_sysfs_quotas, kobj));
+}
+
+static struct kobj_attribute damon_sysfs_quotas_ms_attr =
+ __ATTR_RW_MODE(ms, 0600);
+
+static struct kobj_attribute damon_sysfs_quotas_sz_attr =
+ __ATTR_RW_MODE(bytes, 0600);
+
+static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr =
+ __ATTR_RW_MODE(reset_interval_ms, 0600);
+
+static struct attribute *damon_sysfs_quotas_attrs[] = {
+ &damon_sysfs_quotas_ms_attr.attr,
+ &damon_sysfs_quotas_sz_attr.attr,
+ &damon_sysfs_quotas_reset_interval_ms_attr.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(damon_sysfs_quotas);
+
+static struct kobj_type damon_sysfs_quotas_ktype = {
+ .release = damon_sysfs_quotas_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+ .default_groups = damon_sysfs_quotas_groups,
+};
+
+/*
* access_pattern directory
*/
@@ -220,6 +327,7 @@ struct damon_sysfs_scheme {
struct kobject kobj;
enum damos_action action;
struct damon_sysfs_access_pattern *access_pattern;
+ struct damon_sysfs_quotas *quotas;
};
/* This should match with enum damos_action */
@@ -270,6 +378,25 @@ out:
return err;
}
+static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme)
+{
+ struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc();
+ int err;
+
+ if (!quotas)
+ return -ENOMEM;
+ err = kobject_init_and_add(&quotas->kobj, &damon_sysfs_quotas_ktype,
+ &scheme->kobj, "quotas");
+ if (err)
+ goto out;
+ scheme->quotas = quotas;
+ return 0;
+
+out:
+ kobject_put(&quotas->kobj);
+ return err;
+}
+
static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
{
int err;
@@ -277,13 +404,22 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
err = damon_sysfs_scheme_set_access_pattern(scheme);
if (err)
return err;
+ err = damon_sysfs_scheme_set_quotas(scheme);
+ if (err)
+ goto put_access_pattern_out;
return 0;
+
+put_access_pattern_out:
+ kobject_put(&scheme->access_pattern->kobj);
+ scheme->access_pattern = NULL;
+ return err;
}
static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme)
{
damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern);
kobject_put(&scheme->access_pattern->kobj);
+ kobject_put(&scheme->quotas->kobj);
}
static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr,
@@ -1522,7 +1658,15 @@ static struct damos *damon_sysfs_mk_scheme(
{
struct damon_sysfs_access_pattern *pattern =
sysfs_scheme->access_pattern;
- struct damos_quota quota = (struct damos_quota){};
+ struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas;
+ struct damos_quota quota = {
+ .ms = sysfs_quotas->ms,
+ .sz = sysfs_quotas->sz,
+ .reset_interval = sysfs_quotas->reset_interval_ms,
+ .weight_sz = 1000,
+ .weight_nr_accesses = 1000,
+ .weight_age = 1000,
+ };
struct damos_watermarks wmarks = {
.metric = DAMOS_WMARK_NONE,
.interval = 0,