linux-kernel - [PATCH] mm/damon/core: skip apply schemes if empty

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 16 Jan 2023 14:23:47 +0800
From:   Huaisheng Ye <huaisheng.ye@...el.com>
To:     sj@...nel.org
Cc:     akpm@...ux-foundation.org, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Huaisheng Ye <huaisheng.ye@...el.com>
Subject: [PATCH] mm/damon/core: skip apply schemes if empty

Sometimes there is no scheme in damon's context, for example
just use damo record to monitor workload's data access pattern.

If current damon context doesn't have any scheme in the list,
kdamond has no need to iterate over list of all targets and regions
but do nothing.

So, skip apply schemes when ctx->schemes is empty.

Signed-off-by: Huaisheng Ye <huaisheng.ye@...el.com>
---
 mm/damon/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index ceec75b88ef9..f338691e4591 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1230,7 +1230,8 @@ static int kdamond_fn(void *data)
 			if (ctx->callback.after_aggregation &&
 					ctx->callback.after_aggregation(ctx))
 				break;
-			kdamond_apply_schemes(ctx);
+			if (!list_empty(&ctx->schemes))
+				kdamond_apply_schemes(ctx);
 			kdamond_reset_aggregated(ctx);
 			kdamond_split_regions(ctx);
 			if (ctx->ops.reset_aggregated)
-- 
2.31.1