linux-kernel - Re: [PATCH cgroup/for-5.19-fixes] cgroup: Use separate src/dst nodes when preloading css

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Message-ID: <YquGxN1IWLegNyh6@slm.duckdns.org>
Date:   Thu, 16 Jun 2022 09:38:44 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Mukesh Ojha <quic_mojha@...cinc.com>
Cc:     paulmck@...nel.org, lkml <linux-kernel@...r.kernel.org>,
        cgroups@...r.kernel.org, brauner@...nel.org, hannes@...xchg.org,
        shisiyuan <shisiyuan19870131@...il.com>,
        Li Zefan <lizefan@...wei.com>,
        Michal Koutný <mkoutny@...e.com>
Subject: Re: [PATCH cgroup/for-5.19-fixes] cgroup: Use separate src/dst nodes
 when preloading css_sets for migration

On Mon, Jun 13, 2022 at 12:19:50PM -1000, Tejun Heo wrote:
> Each cset (css_set) is pinned by its tasks. When we're moving tasks around
> across csets for a migration, we need to hold the source and destination
> csets to ensure that they don't go away while we're moving tasks about. This
> is done by linking cset->mg_preload_node on either the
> mgctx->preloaded_dst_csets or mgctx->preloaded_dst_csets list. Using the
> same cset->mg_preload_node for both the src and dst lists was deemed okay as
> a cset can't be both the source and destination at the same time.

Applied to cgroup/for-5.19-fixes w/ patch description fixed.

Thanks.

-- 
tejun