linux-kernel - Re: [Patch v3 6/6] sched/debug: Dump domains' sched group flags

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Date:   Mon, 10 Jul 2023 21:33:53 +0100
From:   Valentin Schneider <vschneid@...hat.com>
To:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ricardo Neri <ricardo.neri@...el.com>,
        "Ravi V . Shankar" <ravi.v.shankar@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Len Brown <len.brown@...el.com>, Mel Gorman <mgorman@...e.de>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Ionela Voinescu <ionela.voinescu@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        naveen.n.rao@...ux.vnet.ibm.com,
        Yicong Yang <yangyicong@...ilicon.com>,
        Barry Song <v-songbaohua@...o.com>,
        Chen Yu <yu.c.chen@...el.com>, Hillf Danton <hdanton@...a.com>
Subject: Re: [Patch v3 6/6] sched/debug: Dump domains' sched group flags

On 07/07/23 15:57, Tim Chen wrote:
> From: "Peter Zijlstra (Intel)" <peterz@...radead.org>
>
> There have been a case where the SD_SHARE_CPUCAPACITY sched group flag
> in a parent domain were not set and propagated properly when a degenerate
> domain is removed.
>
> Add dump of domain sched group flags of a CPU to make debug easier
> in the future.
>
> Usage:
> cat /debug/sched/domains/cpu0/domain1/groups_flags
> to dump cpu0 domain1's sched group flags.
>
> Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>

Reviewed-by: Valentin Schneider <vschneid@...hat.com>