The patch titled
Subject: mm/damon/sysfs: add a file for listing available monitoring ops
has been added to the -mm tree. Its filename is
mm-damon-sysfs-add-a-file-for-listing-available-monitoring-ops.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-damon-sysfs-add-a-file-for-listing-available-monitoring-ops.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-damon-sysfs-add-a-file-for-listing-available-monitoring-ops.patch
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon/sysfs: add a file for listing available monitoring ops
DAMON programming interface users can know if specific monitoring ops set
is registered or not using 'damon_is_registered_ops()', but there is no
such method for the user space. To help the case, this commit adds a new
DAMON sysfs file called 'avail_operations' under each context directory
for listing available monitoring ops. Reading the file will list each
registered monitoring ops on each line.
Link: https://lkml.kernel.org/r/20220426203843.45238-3-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/sysfs.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--- a/mm/damon/sysfs.c~mm-damon-sysfs-add-a-file-for-listing-available-monitoring-ops
+++ a/mm/damon/sysfs.c
@@ -1810,6 +1810,21 @@ static void damon_sysfs_context_rm_dirs(
kobject_put(&context->schemes->kobj);
}
+static ssize_t avail_operations_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ enum damon_ops_id id;
+ int len = 0;
+
+ for (id = 0; id < NR_DAMON_OPS; id++) {
+ if (!damon_is_registered_ops(id))
+ continue;
+ len += sysfs_emit_at(buf, len, "%s\n",
+ damon_sysfs_ops_strs[id]);
+ }
+ return len;
+}
+
static ssize_t operations_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@@ -1840,10 +1855,14 @@ static void damon_sysfs_context_release(
kfree(container_of(kobj, struct damon_sysfs_context, kobj));
}
+static struct kobj_attribute damon_sysfs_context_avail_operations_attr =
+ __ATTR_RO_MODE(avail_operations, 0400);
+
static struct kobj_attribute damon_sysfs_context_operations_attr =
__ATTR_RW_MODE(operations, 0600);
static struct attribute *damon_sysfs_context_attrs[] = {
+ &damon_sysfs_context_avail_operations_attr.attr,
&damon_sysfs_context_operations_attr.attr,
NULL,
};
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-damon-core-test-add-a-kunit-test-case-for-ops-registration.patch
mm-damon-core-add-a-function-for-damon_operations-registration-checks.patch
mm-damon-sysfs-add-a-file-for-listing-available-monitoring-ops.patch
selftets-damon-sysfs-test-existence-and-permission-of-avail_operations.patch
docs-abiadmin-guide-damon-document-avail_operations-sysfs-file.patch
