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.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
samples/damon/wsse.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/samples/damon/wsse.c b/samples/damon/wsse.c
index 2ba0c91baad9..11be25803274 100644
--- a/samples/damon/wsse.c
+++ b/samples/damon/wsse.c
@@ -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);
}
--
2.39.5
