samples/damon/prcl: implement schemes setup

Implement a proactive cold memory regions reclaiming logic of prcl sample
module using DAMOS.  The logic treats memory regions that not accessed at
all for five or more seconds as cold, and reclaim those as soon as found.

Link: https://lkml.kernel.org/r/20241210215030.85675-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c
index b34b9bf..c3acbda 100644 (file)
--- a/samples/damon/prcl.c
+++ b/samples/damon/prcl.c
@@ -49,6 +49,7 @@ static int damon_sample_prcl_after_aggregate(struct damon_ctx *c)
 static int damon_sample_prcl_start(void)
 {
        struct damon_target *target;
+       struct damos *scheme;
 
        pr_info("start\n");
 
@@ -75,6 +76,25 @@ static int damon_sample_prcl_start(void)
 
        ctx->callback.after_aggregation = damon_sample_prcl_after_aggregate;
 
+       scheme = damon_new_scheme(
+                       &(struct damos_access_pattern) {
+                       .min_sz_region = PAGE_SIZE,
+                       .max_sz_region = ULONG_MAX,
+                       .min_nr_accesses = 0,
+                       .max_nr_accesses = 0,
+                       .min_age_region = 50,
+                       .max_age_region = UINT_MAX},
+                       DAMOS_PAGEOUT,
+                       0,
+                       &(struct damos_quota){},
+                       &(struct damos_watermarks){},
+                       NUMA_NO_NODE);
+       if (!scheme) {
+               damon_destroy_ctx(ctx);
+               return -ENOMEM;
+       }
+       damon_set_schemes(ctx, &scheme, 1);
+
        return damon_start(&ctx, 1, true);
 }