linux-kernel - [PATCH 1/2] cgroup: rstat: use same convention to assign cgroup_base

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Message-Id: <20220108003817.6619-1-richard.weiyang@gmail.com>
Date:   Sat,  8 Jan 2022 00:38:16 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH 1/2] cgroup: rstat: use same convention to assign cgroup_base_stat

In function cgroup_base_stat_flush(), we update cgroup_base_stat by
getting rstatc->bstat and adjust delta to related fields.

There are two convention to assign cgroup_base_stat in this function:

  * rstat2 = rstat1
  * rstat2.cputime = rstat1.cputime

The second convention may make audience think just field "cputime" is
updated, while cputime is the only field in cgroup_base_stat.

Let's use the same convention to eliminate this confusion.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 kernel/cgroup/rstat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index a00875375f7d..c626d5a526c4 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -324,7 +324,7 @@ static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu)
 	/* fetch the current per-cpu values */
 	do {
 		seq = __u64_stats_fetch_begin(&rstatc->bsync);
-		cur.cputime = rstatc->bstat.cputime;
+		cur = rstatc->bstat;
 	} while (__u64_stats_fetch_retry(&rstatc->bsync, seq));
 
 	/* propagate percpu delta to global */
-- 
2.33.1