linux-kernel - Re: [PATCH v7 1/3] sched/uclamp: Add a new sysctl to control RT default boost value

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Date:   Fri, 24 Jul 2020 10:54:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Doug Anderson <dianders@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Quentin Perret <qperret@...gle.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Patrick Bellasi <patrick.bellasi@...bug.net>,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v7 1/3] sched/uclamp: Add a new sysctl to control RT
 default boost value

On Thu, Jul 16, 2020 at 12:03:45PM +0100, Qais Yousef wrote:

Would you mind terribly if I rename things like so?

I tried and failed to come up with a shorter name in general, these
functions names are somewhat unwieldy. I considered s/_default//.

---
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -914,7 +914,7 @@ unsigned int uclamp_rq_max_value(struct
 	return uclamp_idle_value(rq, clamp_id, clamp_value);
 }
 
-static void __uclamp_sync_util_min_rt_default_locked(struct task_struct *p)
+static void __uclamp_update_util_min_rt_default(struct task_struct *p)
 {
 	unsigned int default_util_min;
 	struct uclamp_se *uc_se;
@@ -931,7 +931,7 @@ static void __uclamp_sync_util_min_rt_de
 	uclamp_se_set(uc_se, default_util_min, false);
 }
 
-static void __uclamp_sync_util_min_rt_default(struct task_struct *p)
+static void uclamp_update_util_min_rt_default(struct task_struct *p)
 {
 	struct rq_flags rf;
 	struct rq *rq;
@@ -941,7 +941,7 @@ static void __uclamp_sync_util_min_rt_de
 
 	/* Protect updates to p->uclamp_* */
 	rq = task_rq_lock(p, &rf);
-	__uclamp_sync_util_min_rt_default_locked(p);
+	__uclamp_update_util_min_rt_default(p);
 	task_rq_unlock(rq, p, &rf);
 }
 
@@ -968,7 +968,7 @@ static void uclamp_sync_util_min_rt_defa
 
 	rcu_read_lock();
 	for_each_process_thread(g, p)
-		__uclamp_sync_util_min_rt_default(p);
+		uclamp_update_util_min_rt_default(p);
 	rcu_read_unlock();
 }
 
@@ -1360,7 +1360,7 @@ static void __setscheduler_uclamp(struct
 		 * at runtime.
 		 */
 		if (unlikely(rt_task(p) && clamp_id == UCLAMP_MIN))
-			__uclamp_sync_util_min_rt_default_locked(p);
+			__uclamp_update_util_min_rt_default(p);
 		else
 			uclamp_se_set(uc_se, uclamp_none(clamp_id), false);
 
@@ -1404,7 +1404,7 @@ static void uclamp_fork(struct task_stru
 
 static void uclamp_post_fork(struct task_struct *p)
 {
-	__uclamp_sync_util_min_rt_default(p);
+	uclamp_update_util_min_rt_default(p);
 }
 
 static void __init init_uclamp_rq(struct rq *rq)