Commit 60e52e7c authored by SeongJae Park's avatar SeongJae Park Committed by Linus Torvalds
Browse files

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: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6268eac3

mm/damon/reclaim.c

+46 −0
Original line number Diff line number Diff line
@@ -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);