linux-kernel - [PATCH v2 1/9] cgroup: rename cgroup_rstat_flush

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Message-ID: <20230328221644.803272-2-yosryahmed@google.com>
Date:   Tue, 28 Mar 2023 22:16:36 +0000
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Tejun Heo <tj@...nel.org>, Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michal Koutný" <mkoutny@...e.com>
Cc:     Vasily Averin <vasily.averin@...ux.dev>, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, bpf@...r.kernel.org,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: [PATCH v2 1/9] cgroup: rename cgroup_rstat_flush_"irqsafe" to "atomic"

cgroup_rstat_flush_irqsafe() can be a confusing name. It may read as
"irqs are disabled throughout", which is what the current implementation
does (currently under discussion [1]), but is not the intention. The
intention is that this function is safe to call from atomic contexts.
Name it as such.

Suggested-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
Acked-by: Shakeel Butt <shakeelb@...gle.com>
Acked-by: Johannes Weiner <hannes@...xchg.org>
---
 include/linux/cgroup.h | 2 +-
 kernel/cgroup/rstat.c  | 4 ++--
 mm/memcontrol.c        | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 3410aecffdb4..885f5395fcd0 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -692,7 +692,7 @@ static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
  */
 void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);
 void cgroup_rstat_flush(struct cgroup *cgrp);
-void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp);
+void cgroup_rstat_flush_atomic(struct cgroup *cgrp);
 void cgroup_rstat_flush_hold(struct cgroup *cgrp);
 void cgroup_rstat_flush_release(void);
 
diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 831f1f472bb8..d3252b0416b6 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -241,12 +241,12 @@ __bpf_kfunc void cgroup_rstat_flush(struct cgroup *cgrp)
 }
 
 /**
- * cgroup_rstat_flush_irqsafe - irqsafe version of cgroup_rstat_flush()
+ * cgroup_rstat_flush_atomic- atomic version of cgroup_rstat_flush()
  * @cgrp: target cgroup
  *
  * This function can be called from any context.
  */
-void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp)
+void cgroup_rstat_flush_atomic(struct cgroup *cgrp)
 {
 	unsigned long flags;
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5abffe6f8389..0205e58ea430 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -642,7 +642,7 @@ static void __mem_cgroup_flush_stats(void)
 		return;
 
 	flush_next_time = jiffies_64 + 2*FLUSH_TIME;
-	cgroup_rstat_flush_irqsafe(root_mem_cgroup->css.cgroup);
+	cgroup_rstat_flush_atomic(root_mem_cgroup->css.cgroup);
 	atomic_set(&stats_flush_threshold, 0);
 	spin_unlock_irqrestore(&stats_flush_lock, flag);
 }
-- 
2.40.0.348.gf938b09366-goog