linux-kernel - [RFC PATCH 14/18] mm/damon/core: pass per-region filter-passed bytes to damos_walk_control->walk

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Message-Id: <20241219040327.61902-15-sj@kernel.org>
Date: Wed, 18 Dec 2024 20:03:23 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: kernel-team@...a.com,
	SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 14/18] mm/damon/core: pass per-region filter-passed bytes to damos_walk_control->walk_fn()

Total size of memory that passed DAMON operations set layer-handled
DAMOS filters per scheme is provided to DAMON core API and ABI (sysfs
interface) users.  It is useful, but that for each region can be more
fine-grained information.  Provide it to users of DAMON core API,
specifically damos_walk() users, by passing the data to
damos_walk_control->walk_fn().

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/damon.h | 2 +-
 mm/damon/core.c       | 7 ++++---
 mm/damon/sysfs.c      | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 4a68bb38aad5..b88f710297a9 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -393,7 +393,7 @@ struct damos;
 struct damos_walk_control {
 	void (*walk_fn)(void *data, struct damon_ctx *ctx,
 			struct damon_target *t, struct damon_region *r,
-			struct damos *s);
+			struct damos *s, unsigned long sz_filter_passed);
 	void *data;
 /* private: internal use only */
 	/* informs if the kdamond finished handling of the walk request */
diff --git a/mm/damon/core.c b/mm/damon/core.c
index f7736df4f6c8..f566cdcbb434 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1437,7 +1437,8 @@ static bool damos_filter_out(struct damon_ctx *ctx, struct damon_target *t,
  * installed by damos_walk() and not yet uninstalled, invoke it.
  */
 static void damos_walk_call_walk(struct damon_ctx *ctx, struct damon_target *t,
-		struct damon_region *r, struct damos *s)
+		struct damon_region *r, struct damos *s,
+		unsigned long sz_filter_passed)
 {
 	struct damos_walk_control *control;
 
@@ -1446,7 +1447,7 @@ static void damos_walk_call_walk(struct damon_ctx *ctx, struct damon_target *t,
 	mutex_unlock(&ctx->walk_control_lock);
 	if (!control)
 		return;
-	control->walk_fn(control->data, ctx, t, r, s);
+	control->walk_fn(control->data, ctx, t, r, s, sz_filter_passed);
 }
 
 /*
@@ -1566,7 +1567,7 @@ static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t,
 			sz_applied = c->ops.apply_scheme(c, t, r, s,
 					&sz_ops_filter_passed);
 		}
-		damos_walk_call_walk(c, t, r, s);
+		damos_walk_call_walk(c, t, r, s, sz_ops_filter_passed);
 		ktime_get_coarse_ts64(&end);
 		quota->total_charged_ns += timespec64_to_ns(&end) -
 			timespec64_to_ns(&begin);
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index cf8fb5a963d6..224873ca8aa6 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1454,7 +1454,7 @@ struct damon_sysfs_schemes_walk_data {
 /* populate the region directory */
 static void damon_sysfs_schemes_tried_regions_upd_one(void *data, struct damon_ctx *ctx,
 		struct damon_target *t, struct damon_region *r,
-		struct damos *s)
+		struct damos *s, unsigned long sz_filter_passed)
 {
 	struct damon_sysfs_schemes_walk_data *walk_data = data;
 	struct damon_sysfs_kdamond *sysfs_kdamond = walk_data->sysfs_kdamond;
-- 
2.39.5