linux-kernel - Re: [PATCH v3 0/4] Fix some warnings about rq clock

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Message-ID: <a67af05b-8386-f4ec-c5da-623ce30032a5@bytedance.com>
Date:   Tue, 23 May 2023 15:52:11 +0800
From:   Hao Jia <jiahao.os@...edance.com>
To:     mingo@...hat.com, peterz@...radead.org, mingo@...nel.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        mgorman@...hsingularity.net
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] Fix some warnings about rq clock

kindly ping...


On 2023/5/15 Hao Jia wrote:
> These four patches fix some warnings about rq clock.
> 
> Patch1 fixes the warning of using the old rq clock caused by
> missing update rq clock.
> 
> Patch2-4 fixes the warning that the rq clock was updated multiple
> times while holding the rq lock.
> 
> v2->v3:
>      - Modify the commit information of patch1 to make the description clearer.
>      - Split v2 patch2 into 3 separate patches.
> 
> v1->v2:
>      - Vincent Guittot suggested using rq_clock_start_loop_update()
>        to prevent multiple calls to update_rq_clock() in unthrottle_cfs_rq()
>        instead of removing update_rq_clock() from unthrottle_cfs_rq()
>        and updating the rq clock before unthrottle_cfs_rq() for patch2.
> 
> [v2] https://lore.kernel.org/all/20230510083450.62334-1-jiahao.os@bytedance.com
> [v1] https://lore.kernel.org/all/20230410081206.23441-1-jiahao.os@bytedance.com
> 
> 
> Hao Jia (4):
>    sched/core: Fixed missing rq clock update before calling
>      set_rq_offline()
>    sched/core: Avoid double calling update_rq_clock() in
>      __balance_push_cpu_stop()
>    sched/core: Avoid multiple calling update_rq_clock() in
>      __cfsb_csd_unthrottle()
>    sched/core: Avoid multiple calling update_rq_clock() in
>      unthrottle_offline_cfs_rqs()
> 
>   kernel/sched/core.c     |  7 ++++---
>   kernel/sched/fair.c     | 18 ++++++++++++++++++
>   kernel/sched/sched.h    | 21 +++++++++++++++++++++
>   kernel/sched/topology.c | 10 ++++++----
>   4 files changed, 49 insertions(+), 7 deletions(-)
>