linux-kernel - Re: [PATCH] cgroup/cpuset: fix circular locking dependency

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Message-ID: <20171211152059.GH2421075@devbig577.frc2.facebook.com>
Date:   Mon, 11 Dec 2017 07:20:59 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Prateek Sood <prsood@...eaurora.org>, avagin@...il.com,
        mingo@...nel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, sramana@...eaurora.org
Subject: Re: [PATCH] cgroup/cpuset: fix circular locking dependency

Hello, Peter.

On Tue, Dec 05, 2017 at 12:01:17AM +0100, Peter Zijlstra wrote:
> > AFAICS, this should remove the circular dependency you originally
> > reported.  I'll revert the two cpuset commits for now.
> 
> So I liked his patches in that we would be able to go back to
> synchronous sched_domain building.

Ah, yeah, that's a separate issue but didn't we intentionally make
that asynchronous?  IIRC, cpuset migration can take a really long time
when the memory migration is turned on and doing that synchronously
could mess up the system.

Thanks.

-- 
tejun