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

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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: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2024-12-10 13:50:28 -08:00 committed by Andrew Morton
parent d452d76f63
commit 6c49b56bbc
1 changed files with 18 additions and 0 deletions
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18
samples/damon/wsse.c
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@ -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);
}