lkml.org 
[lkml]   [2021]   [Jan]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/6] sched/deadline: Consolidate the SCHED_DL task_can_attach() check on its own function
Date
It is easier to track the restrictions imposed on SCHED_DEADLINE
tasks if we keep them all together in a single function.

No function changes.

Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: linux-kernel@vger.kernel.org
Cc: cgroups@vger.kernel.org
---
kernel/sched/core.c | 3 +--
kernel/sched/deadline.c | 7 +++++++
2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7af80c3fce12..f4aede34449c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7142,8 +7142,7 @@ int task_can_attach(struct task_struct *p,
goto out;
}

- if (dl_task(p) && !cpumask_intersects(task_rq(p)->rd->span,
- cs_cpus_allowed))
+ if (dl_task(p))
ret = dl_task_can_attach(p, cs_cpus_allowed);

out:
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 75686c6d4436..c97d2c707b98 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2870,6 +2870,13 @@ int dl_task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allo
bool overflow;
int ret;

+ /*
+ * The task is not moving to another root domain, so it is
+ * already accounted.
+ */
+ if (cpumask_intersects(task_rq(p)->rd->span, cs_cpus_allowed))
+ return 0;
+
dest_cpu = cpumask_any_and(cpu_active_mask, cs_cpus_allowed);

rcu_read_lock_sched();
--
2.29.2
\
 
 \ /
  Last update: 2021-01-12 16:57    [W:0.108 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site