The patch titled
Subject: mm/damon/sysfs-schemes: implement filters directory
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-sysfs-schemes-implement-filters-directory.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-schemes-implement-filters-directory.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon/sysfs-schemes: implement filters directory
Date: Mon, 5 Dec 2022 23:08:24 +0000
DAMOS filters are currently supported by only DAMON kernel API. To expose
the feature to user space, implement a DAMON sysfs directory named
'filters' under each scheme directory. Please note that this is
implementing only the directory. Following commits will implement more
files and directories, and finally connect the DAMOS filters feature.
Link: https://lkml.kernel.org/r/20221205230830.144349-6-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/sysfs-schemes.c | 85 ++++++++++++++++++++++++++++++++++++-
1 file changed, 84 insertions(+), 1 deletion(-)
--- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-implement-filters-directory
+++ a/mm/damon/sysfs-schemes.c
@@ -259,6 +259,63 @@ static struct kobj_type damon_sysfs_stat
};
/*
+ * filters directory
+ */
+
+struct damon_sysfs_scheme_filters {
+ struct kobject kobj;
+ int nr;
+};
+
+static struct damon_sysfs_scheme_filters *
+damon_sysfs_scheme_filters_alloc(void)
+{
+ return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL);
+}
+
+static ssize_t nr_filters_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct damon_sysfs_scheme_filters *filters = container_of(kobj,
+ struct damon_sysfs_scheme_filters, kobj);
+
+ return sysfs_emit(buf, "%d\n", filters->nr);
+}
+
+static ssize_t nr_filters_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int nr, err = kstrtoint(buf, 0, &nr);
+
+ if (err)
+ return err;
+ if (nr < 0)
+ return -EINVAL;
+
+ return count;
+}
+
+static void damon_sysfs_scheme_filters_release(struct kobject *kobj)
+{
+ kfree(container_of(kobj, struct damon_sysfs_scheme_filters, kobj));
+}
+
+static struct kobj_attribute damon_sysfs_scheme_filters_nr_attr =
+ __ATTR_RW_MODE(nr_filters, 0600);
+
+static struct attribute *damon_sysfs_scheme_filters_attrs[] = {
+ &damon_sysfs_scheme_filters_nr_attr.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(damon_sysfs_scheme_filters);
+
+static struct kobj_type damon_sysfs_scheme_filters_ktype = {
+ .release = damon_sysfs_scheme_filters_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+ .default_groups = damon_sysfs_scheme_filters_groups,
+};
+
+/*
* watermarks directory
*/
@@ -784,6 +841,7 @@ struct damon_sysfs_scheme {
struct damon_sysfs_access_pattern *access_pattern;
struct damon_sysfs_quotas *quotas;
struct damon_sysfs_watermarks *watermarks;
+ struct damon_sysfs_scheme_filters *filters;
struct damon_sysfs_stats *stats;
struct damon_sysfs_scheme_regions *tried_regions;
};
@@ -878,6 +936,24 @@ static int damon_sysfs_scheme_set_waterm
return err;
}
+static int damon_sysfs_scheme_set_filters(struct damon_sysfs_scheme *scheme)
+{
+ struct damon_sysfs_scheme_filters *filters =
+ damon_sysfs_scheme_filters_alloc();
+ int err;
+
+ if (!filters)
+ return -ENOMEM;
+ err = kobject_init_and_add(&filters->kobj,
+ &damon_sysfs_scheme_filters_ktype, &scheme->kobj,
+ "filters");
+ if (err)
+ kobject_put(&filters->kobj);
+ else
+ scheme->filters = filters;
+ return err;
+}
+
static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme)
{
struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc();
@@ -926,9 +1002,12 @@ static int damon_sysfs_scheme_add_dirs(s
err = damon_sysfs_scheme_set_watermarks(scheme);
if (err)
goto put_quotas_access_pattern_out;
- err = damon_sysfs_scheme_set_stats(scheme);
+ err = damon_sysfs_scheme_set_filters(scheme);
if (err)
goto put_watermarks_quotas_access_pattern_out;
+ err = damon_sysfs_scheme_set_stats(scheme);
+ if (err)
+ goto put_filters_watermarks_quotas_access_pattern_out;
err = damon_sysfs_scheme_set_tried_regions(scheme);
if (err)
goto put_tried_regions_out;
@@ -937,6 +1016,9 @@ static int damon_sysfs_scheme_add_dirs(s
put_tried_regions_out:
kobject_put(&scheme->tried_regions->kobj);
scheme->tried_regions = NULL;
+put_filters_watermarks_quotas_access_pattern_out:
+ kobject_put(&scheme->filters->kobj);
+ scheme->filters = NULL;
put_watermarks_quotas_access_pattern_out:
kobject_put(&scheme->watermarks->kobj);
scheme->watermarks = NULL;
@@ -956,6 +1038,7 @@ static void damon_sysfs_scheme_rm_dirs(s
damon_sysfs_quotas_rm_dirs(scheme->quotas);
kobject_put(&scheme->quotas->kobj);
kobject_put(&scheme->watermarks->kobj);
+ kobject_put(&scheme->filters->kobj);
kobject_put(&scheme->stats->kobj);
damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions);
kobject_put(&scheme->tried_regions->kobj);
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-damon-core-implement-damos-filter.patch
mm-damon-paddr-support-damos-filters.patch
mm-damon-reclaim-add-a-parameter-called-skip_anon-for-avoiding-anonymous-pages-reclamation.patch
docs-admin-guide-damon-reclaim-document-skip_anon-parameter.patch
mm-damon-sysfs-schemes-implement-filters-directory.patch
mm-damon-sysfs-schemes-implement-filter-directory.patch
mm-damon-sysfs-schemes-connect-filter-directory-and-filters-directory.patch
mm-damon-sysfs-schemes-implement-scheme-filters.patch
selftests-damon-sysfs-test-filters-directory.patch
docs-admin-guide-mm-damon-usage-document-damos-filters-of-sysfs.patch
docs-abi-damon-document-scheme-filters-files.patch
