Commit 65cc56d0 authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

samples/damon/wsse: implement working set size estimation and logging 

Implement the DAMON-based working set size estimation logic.  The logic
iterates memory regions in DAMON-generated access pattern snapshot for
every aggregation interval and get the total sum of the size of any region
having one or higher 'nr_accesses' count.  That is, it assumes any region
having one or higher 'nr_accesses' to be a part of the working set.  The
estimated value is reported to the user by printing it to the kernel log.

Link: https://lkml.kernel.org/r/20241210215030.85675-4-sj@kernel.org


Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent b757c6cf

samples/damon/wsse.c

+18 −0
Original line number Diff line number Diff line
@@ -30,6 +30,23 @@ MODULE_PARM_DESC(enable, "Enable or disable DAMON_SAMPLE_WSSE"); 
static struct damon_ctx *ctx;

static struct pid *target_pidp;



static int damon_sample_wsse_after_aggregate(struct damon_ctx *c)

{

	struct damon_target *t;



	damon_for_each_target(t, c) {

		struct damon_region *r;

		unsigned long wss = 0;



		damon_for_each_region(r, t) {

			if (r->nr_accesses > 0)

				wss += r->ar.end - r->ar.start;

		}

		pr_info("wss: %lu\n", wss);

	}

	return 0;

}



static int damon_sample_wsse_start(void)

{

	struct damon_target *target;
@@ -57,6 +74,7 @@ static int damon_sample_wsse_start(void) 
	}

	target->pid = target_pidp;



	ctx->callback.after_aggregation = damon_sample_wsse_after_aggregate;

	return damon_start(&ctx, 1, true);

}