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| author | SeongJae Park <sj@kernel.org> | 2022-05-10 04:20:51 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-05-13 17:20:06 +0300 |
| commit | 0f2cb5885771b31fd1c82a1293787d1e378eaab5 (patch) | |
| tree | 38b08a687cc93c89d13284a22fa749f2efd7c8ad /mm/damon | |
| parent | 152e56178ad72037bc6a2f08d4a608543bc67cdf (diff) | |
| download | linux-0f2cb5885771b31fd1c82a1293787d1e378eaab5.tar.xz | |
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@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/damon')
| -rw-r--r-- | mm/damon/sysfs.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 48e434cd43d8..6ad6364780b8 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -1810,6 +1810,21 @@ static void damon_sysfs_context_rm_dirs(struct damon_sysfs_context *context) 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(struct kobject *kobj) 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, }; |