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authorSeongJae Park <sj@kernel.org>2023-11-30 05:36:46 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-12-12 21:57:03 +0300
commit8b549a4fd3c5fd721e268564596095398b0469bc (patch)
treed4191189775ea12526c216bb93431babb3de8713 /mm/damon
parent7f262da0a30df32a960f90ab6c11b08a7233ea34 (diff)
downloadlinux-8b549a4fd3c5fd721e268564596095398b0469bc.tar.xz
mm/damon/sysfs-schemes: commit damos quota goals user input to DAMOS
Make DAMON sysfs interface to read the user inputs for DAMOS quota goals and pass those to DAMOS, so that the users can use the quota auto-tuning feature. It uses the DAMON sysfs interface's user input commit mechanism, which applies all user inputs for initial starting of DAMON and online input updates, which can be done by writing 'on' and 'commit' to the kdamond's 'state' file, respectively. In other words, the user should periodically write appropriate value to 'current_value' files and 'commit' command to the 'state' file. 'target_value' files could also be similarly updated at any time. Note that the interface is supporting multiple goals while the core logic supports only one goal. DAMON sysfs interface passes only best feedback among the given inputs, to avoid making DAMOS too aggressive. Link: https://lkml.kernel.org/r/20231130023652.50284-4-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Brendan Higgins <brendanhiggins@google.com> Cc: David Gow <davidgow@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/damon')
-rw-r--r--mm/damon/sysfs-schemes.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index e5531dbd4cf1..a7917534ca19 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1868,6 +1868,34 @@ static int damon_sysfs_set_scheme_filters(struct damos *scheme,
return 0;
}
+static unsigned long damos_sysfs_get_quota_score(void *arg)
+{
+ return (unsigned long)arg;
+}
+
+static void damos_sysfs_set_quota_score(
+ struct damos_sysfs_quota_goals *sysfs_goals,
+ struct damos_quota *quota)
+{
+ struct damos_sysfs_quota_goal *sysfs_goal;
+ int i;
+
+ quota->get_score = NULL;
+ quota->get_score_arg = (void *)0;
+ for (i = 0; i < sysfs_goals->nr; i++) {
+ sysfs_goal = sysfs_goals->goals_arr[i];
+ if (!sysfs_goal->target_value)
+ continue;
+
+ /* Higher score makes scheme less aggressive */
+ quota->get_score_arg = (void *)max(
+ (unsigned long)quota->get_score_arg,
+ sysfs_goal->current_value * 10000 /
+ sysfs_goal->target_value);
+ quota->get_score = damos_sysfs_get_quota_score;
+ }
+}
+
static struct damos *damon_sysfs_mk_scheme(
struct damon_sysfs_scheme *sysfs_scheme)
{
@@ -1905,6 +1933,8 @@ static struct damos *damon_sysfs_mk_scheme(
.low = sysfs_wmarks->low,
};
+ damos_sysfs_set_quota_score(sysfs_quotas->goals, &quota);
+
scheme = damon_new_scheme(&pattern, sysfs_scheme->action,
sysfs_scheme->apply_interval_us, &quota, &wmarks);
if (!scheme)
@@ -1945,6 +1975,8 @@ static void damon_sysfs_update_scheme(struct damos *scheme,
scheme->quota.weight_nr_accesses = sysfs_weights->nr_accesses;
scheme->quota.weight_age = sysfs_weights->age;
+ damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota);
+
scheme->wmarks.metric = sysfs_wmarks->metric;
scheme->wmarks.interval = sysfs_wmarks->interval_us;
scheme->wmarks.high = sysfs_wmarks->high;