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authorSeongJae Park <sj@kernel.org>2022-01-14 14:10:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-15 16:30:33 +0200
commit60e52e7c46a127bca5ddd48b89002564f3862063 (patch)
tree850b8110bdf2046d57ce3041eff93b4d0677591e /mm
parent6268eac34ca30af7f6313504d556ec7fcd295621 (diff)
mm/damon/reclaim: provide reclamation statistics
This implements new DAMON_RECLAIM parameters for statistics reporting. Those can be used for understanding how DAMON_RECLAIM is working, and for tuning the other parameters. Link: https://lkml.kernel.org/r/20211210150016.35349-4-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/damon/reclaim.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index dc1485044eaf..bc476cef688e 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -185,6 +185,36 @@ module_param(monitor_region_end, ulong, 0600);
static int kdamond_pid __read_mostly = -1;
module_param(kdamond_pid, int, 0400);
+/*
+ * Number of memory regions that tried to be reclaimed.
+ */
+static unsigned long nr_reclaim_tried_regions __read_mostly;
+module_param(nr_reclaim_tried_regions, ulong, 0400);
+
+/*
+ * Total bytes of memory regions that tried to be reclaimed.
+ */
+static unsigned long bytes_reclaim_tried_regions __read_mostly;
+module_param(bytes_reclaim_tried_regions, ulong, 0400);
+
+/*
+ * Number of memory regions that successfully be reclaimed.
+ */
+static unsigned long nr_reclaimed_regions __read_mostly;
+module_param(nr_reclaimed_regions, ulong, 0400);
+
+/*
+ * Total bytes of memory regions that successfully be reclaimed.
+ */
+static unsigned long bytes_reclaimed_regions __read_mostly;
+module_param(bytes_reclaimed_regions, ulong, 0400);
+
+/*
+ * Number of times that the time/space quota limits have exceeded
+ */
+static unsigned long nr_quota_exceeds __read_mostly;
+module_param(nr_quota_exceeds, ulong, 0400);
+
static struct damon_ctx *ctx;
static struct damon_target *target;
@@ -333,6 +363,21 @@ static void damon_reclaim_timer_fn(struct work_struct *work)
}
static DECLARE_DELAYED_WORK(damon_reclaim_timer, damon_reclaim_timer_fn);
+static int damon_reclaim_after_aggregation(struct damon_ctx *c)
+{
+ struct damos *s;
+
+ /* update the stats parameter */
+ damon_for_each_scheme(s, c) {
+ nr_reclaim_tried_regions = s->stat.nr_tried;
+ bytes_reclaim_tried_regions = s->stat.sz_tried;
+ nr_reclaimed_regions = s->stat.nr_applied;
+ bytes_reclaimed_regions = s->stat.sz_applied;
+ nr_quota_exceeds = s->stat.qt_exceeds;
+ }
+ return 0;
+}
+
static int __init damon_reclaim_init(void)
{
ctx = damon_new_ctx();
@@ -340,6 +385,7 @@ static int __init damon_reclaim_init(void)
return -ENOMEM;
damon_pa_set_primitives(ctx);
+ ctx->callback.after_aggregation = damon_reclaim_after_aggregation;
/* 4242 means nothing but fun */
target = damon_new_target(4242);