linux-kernel - [PATCH v4 0/2] sched/core: Avoid obvious double update_rq

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Message-Id: <20220430085843.62939-1-jiahao.os@bytedance.com>
Date:   Sat, 30 Apr 2022 16:58:41 +0800
From:   Hao Jia <jiahao.os@...edance.com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com
Cc:     linux-kernel@...r.kernel.org, Hao Jia <jiahao.os@...edance.com>
Subject: [PATCH v4 0/2] sched/core: Avoid obvious double update_rq_clock warning

These two patches are about the kernel scheduler:

patch 1: fixed the issue that kernel may trigger WARN_DOUBLE_CLOCK warning.
patch 2: removed some no longer needed comments in the deadline scheduler
and cleaned up the code.

Thanks for suggestion from Dietmar Eggemann & Peter Zijlstra.

v3->v4:
   - Modify some code formats and commit messages.
   - Add Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com> for
     patch 1.
   - Add Reviewed-by: Daniel Bristot de Oliveira <bristot@...hat.com>
     for patch 2.

v2->v3:
   - Modify some descriptions and errors in the commit information.
   - Fixed a bug that might trigger the WARN_DOUBLE_CLOCK warning in
     migrate_task_rq_dl().
   - Add Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com> for
     patch 2.

v1->v2:
   - Added double_rq_clock_clear_update inline helper to clear RQCF_UPDATED
     of rq->clock_update_flags.
   - split into two separate patches.

[v1] https://lore.kernel.org/lkml/20220418090929.54005-1-jiahao.os@bytedance.com/
[v2] https://lore.kernel.org/lkml/20220422090944.52618-1-jiahao.os@bytedance.com/
[v3] https://lore.kernel.org/all/20220427080014.18483-1-jiahao.os@bytedance.com/

Hao Jia (2):
  sched/core: Avoid obvious double update_rq_clock warning
  sched/deadline: Remove superfluous rq clock update in push_dl_task()

 kernel/sched/core.c     |  6 +++---
 kernel/sched/deadline.c | 13 ++++---------
 kernel/sched/rt.c       |  5 +++--
 kernel/sched/sched.h    | 28 ++++++++++++++++++++++++----
 4 files changed, 34 insertions(+), 18 deletions(-)

-- 
2.32.0