From: Valentin Schneider <valentin.schneider@arm.com>
To: Steve Sistare <steven.sistare@oracle.com>,
mingo@redhat.com, peterz@infradead.org
Cc: subhra.mazumdar@oracle.com, dhaval.giani@oracle.com,
daniel.m.jordan@oracle.com, pavel.tatashin@microsoft.com,
matt@codeblueprint.co.uk, umgwanakikbuti@gmail.com,
riel@redhat.com, jbacik@fb.com, juri.lelli@redhat.com,
vincent.guittot@linaro.org, quentin.perret@arm.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 10/10] sched/fair: Provide idle search schedstats
Date: Fri, 7 Dec 2018 11:56:23 +0000 [thread overview]
Message-ID: <be837c2a-6e8d-3598-0a27-db90792a2673@arm.com> (raw)
In-Reply-To: <1544131696-2888-11-git-send-email-steven.sistare@oracle.com>
Hi Steve,
On 06/12/2018 21:28, Steve Sistare wrote:
[...]
> @@ -6392,6 +6422,7 @@ static int wake_cap(struct task_struct *p, int cpu, int prev_cpu)
> static int
> select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_flags)
> {
> + unsigned long time = schedstat_start_time();
With arm64's defconfig (!CONFIG_SCHEDSTATS) I get:
kernel/sched/fair.c: In function ‘select_task_rq_fair’:
kernel/sched/fair.c:6459:16: warning: unused variable ‘time’ [-Wunused-variable]
unsigned long time = schedstat_start_time();
^~~~
So you probably want something like this:
----->8-----
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5a113a8..7d33f74 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6456,12 +6456,14 @@ static int wake_cap(struct task_struct *p, int cpu, int prev_cpu)
static int
select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_flags)
{
- unsigned long time = schedstat_start_time();
struct sched_domain *tmp, *sd = NULL;
int cpu = smp_processor_id();
int new_cpu = prev_cpu;
int want_affine = 0;
int sync = (wake_flags & WF_SYNC) && !(current->flags & PF_EXITING);
+ unsigned long time;
+
+ time = schedstat_start_time();
if (sd_flag & SD_BALANCE_WAKE) {
record_wakee(p);
-----8<-----
The 0-day bot will catch those but since it's the only warn I got I figured
I'd report it :)
> struct sched_domain *tmp, *sd = NULL;
> int cpu = smp_processor_id();
> int new_cpu = prev_cpu;
[...]
next prev parent reply other threads:[~2018-12-07 11:56 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 21:28 [PATCH v4 00/10] steal tasks to improve CPU utilization Steve Sistare
2018-12-06 21:28 ` [PATCH v4 01/10] sched: Provide sparsemask, a reduced contention bitmap Steve Sistare
2019-01-31 19:18 ` Tim Chen
2018-12-06 21:28 ` [PATCH v4 02/10] sched/topology: Provide hooks to allocate data shared per LLC Steve Sistare
2018-12-06 21:28 ` [PATCH v4 03/10] sched/topology: Provide cfs_overload_cpus bitmap Steve Sistare
2018-12-07 20:20 ` Valentin Schneider
2018-12-07 22:35 ` Steven Sistare
2018-12-08 18:33 ` Valentin Schneider
2018-12-06 21:28 ` [PATCH v4 04/10] sched/fair: Dynamically update cfs_overload_cpus Steve Sistare
2018-12-07 20:20 ` Valentin Schneider
2018-12-07 22:35 ` Steven Sistare
2018-12-08 18:47 ` Valentin Schneider
2018-12-06 21:28 ` [PATCH v4 05/10] sched/fair: Hoist idle_stamp up from idle_balance Steve Sistare
2018-12-06 21:28 ` [PATCH v4 06/10] sched/fair: Generalize the detach_task interface Steve Sistare
2018-12-06 21:28 ` [PATCH v4 07/10] sched/fair: Provide can_migrate_task_llc Steve Sistare
2018-12-06 21:28 ` [PATCH v4 08/10] sched/fair: Steal work from an overloaded CPU when CPU goes idle Steve Sistare
2018-12-07 20:21 ` Valentin Schneider
2018-12-07 22:36 ` Steven Sistare
2018-12-08 18:39 ` Valentin Schneider
2018-12-06 21:28 ` [PATCH v4 09/10] sched/fair: disable stealing if too many NUMA nodes Steve Sistare
2018-12-07 11:43 ` Valentin Schneider
2018-12-07 13:37 ` Steven Sistare
2018-12-06 21:28 ` [PATCH v4 10/10] sched/fair: Provide idle search schedstats Steve Sistare
2018-12-07 11:56 ` Valentin Schneider [this message]
2018-12-07 13:45 ` Steven Sistare
2018-12-24 12:25 ` Rick Lindsley
2019-01-14 17:04 ` Steven Sistare
2018-12-07 20:30 ` [PATCH v4 00/10] steal tasks to improve CPU utilization Valentin Schneider
2018-12-07 22:36 ` Steven Sistare
2019-02-01 15:07 ` Valentin Schneider
2018-12-10 16:10 ` Vincent Guittot
2018-12-10 16:29 ` Steven Sistare
2018-12-10 16:33 ` Vincent Guittot
2018-12-10 17:08 ` Vincent Guittot
2018-12-10 17:20 ` Steven Sistare
2018-12-10 17:06 ` Valentin Schneider
2019-01-04 13:44 ` Shijith Thotton
2019-01-14 16:55 ` Steven Sistare
2019-01-31 17:16 ` Dhaval Giani
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