linux-kernel - Re: [PATCH v3 4/9] cgroup/cpuset: Enable event notification when partition become invalid

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Message-ID: <YP9BxKXfhaoTE+LO@slm.duckdns.org>
Date:   Mon, 26 Jul 2021 13:14:12 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Shuah Khan <shuah@...nel.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Phil Auld <pauld@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Michal Koutný <mkoutny@...e.com>
Subject: Re: [PATCH v3 4/9] cgroup/cpuset: Enable event notification when
 partition become invalid

On Tue, Jul 20, 2021 at 10:18:29AM -0400, Waiman Long wrote:
> +static inline void notify_partition_change(struct cpuset *cs,
> +					   int old_prs, int new_prs)
> +{
> +	if ((old_prs == new_prs) ||
> +	   ((old_prs != PRS_ERROR) && (new_prs != PRS_ERROR)))
> +		return;
> +	cgroup_file_notify(&cs->partition_file);

I'd generate an event on any state changes. The user have to read the file
to find out what happened anyway.

Thanks.

-- 
tejun