The patch titled
Subject: mm/damon/reclaim: provide reclamation statistics
has been added to the -mm tree. Its filename is
mm-damon-reclaim-provide-reclamation-statistics.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-damon-reclaim-provide-reclamation-statistics.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-damon-reclaim-provide-reclamation-statistics.patch
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon/reclaim: provide reclamation statistics
This commit 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@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/reclaim.c | 46 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
--- a/mm/damon/reclaim.c~mm-damon-reclaim-provide-reclamation-statistics
+++ a/mm/damon/reclaim.c
@@ -185,6 +185,36 @@ module_param(monitor_region_end, ulong,
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(struc
}
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(voi
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);
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
timers-implement-usleep_idle_range.patch
mm-damon-core-fix-fake-load-reports-due-to-uninterruptible-sleeps.patch
mm-damon-core-use-better-timer-mechanisms-selection-threshold.patch
mm-damon-dbgfs-remove-an-unnecessary-error-message.patch
mm-damon-core-remove-unnecessary-error-messages.patch
mm-damon-vaddr-remove-an-unnecessary-warning-message.patch
mm-damon-vaddr-test-split-a-test-function-having-1024-bytes-frame-size.patch
mm-damon-vaddr-test-remove-unnecessary-variables.patch
selftests-damon-skip-test-if-damon-is-running.patch
selftests-damon-test-damon-enabling-with-empty-target_ids-case.patch
selftests-damon-test-wrong-damos-condition-ranges-input.patch
selftests-damon-test-debugfs-file-reads-writes-with-huge-count.patch
selftests-damon-split-test-cases.patch
mm-damon-remove-some-no-need-func-definitions-in-damonh-file-fix.patch
mm-damon-convert-macro-functions-to-static-inline-functions.patch
docs-admin-guide-mm-damon-usage-update-for-scheme-quotas-and-watermarks.patch
docs-admin-guide-mm-damon-usage-remove-redundant-information.patch
docs-admin-guide-mm-damon-usage-mention-tracepoint-at-the-beginning.patch
docs-admin-guide-mm-damon-usage-update-for-kdamond_pid-and-mkrm_contexts.patch
mm-damon-remove-a-mistakenly-added-comment-for-a-future-feature.patch
mm-damon-schemes-account-scheme-actions-that-successfully-applied.patch
mm-damon-schemes-account-how-many-times-quota-limit-has-exceeded.patch
mm-damon-reclaim-provide-reclamation-statistics.patch
docs-admin-guide-mm-damon-reclaim-document-statistics-parameters.patch
mm-damon-dbgfs-support-all-damos-stats.patch
docs-admin-guide-mm-damon-usage-update-for-schemes-statistics.patch
