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mm/damon/sysfs: support DAMOS quotas
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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>
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SeongJae Park authored and Linus Torvalds committed Mar 22, 2022
1 parent 7e84b1f commit 9bbb820
Showing 1 changed file with 145 additions and 1 deletion.
146 changes: 145 additions & 1 deletion mm/damon/sysfs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,113 @@ static struct kobj_type damon_sysfs_ul_range_ktype = {
.default_groups = damon_sysfs_ul_range_groups,
};

/*
* 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
*/
Expand Down Expand Up @@ -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 */
Expand Down Expand Up @@ -270,20 +378,48 @@ static int damon_sysfs_scheme_set_access_pattern(
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;

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,
Expand Down Expand Up @@ -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,
Expand Down

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