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mm/damon/reclaim: provide reclamation statistics

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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>
This commit is contained in:
SeongJae Park 2022-01-14 14:10:23 -08:00 committed by Linus Torvalds
parent 6268eac34c
commit 60e52e7c46
1 changed files with 46 additions and 0 deletions
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46
mm/damon/reclaim.c
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@ -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);