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

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Message-ID: <20171204230117.GF20227@worktop.programming.kicks-ass.net>
Date:   Tue, 5 Dec 2017 00:01:17 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tejun Heo <tj@...nel.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

On Mon, Dec 04, 2017 at 02:58:25PM -0800, Tejun Heo wrote:
> Hello, again.
> 
> On Mon, Dec 04, 2017 at 12:22:19PM -0800, Tejun Heo wrote:
> > Hello,
> > 
> > On Mon, Dec 04, 2017 at 10:44:49AM +0530, Prateek Sood wrote:
> > > Any feedback/suggestion for this patch?
> > 
> > Sorry about the delay.  I'm a bit worried because it feels like we're
> > chasing a squirrel.  I'll think through the recent changes and this
> > one and get back to you.
> 
> Can you please take a look at the following pending commit?
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git/commit/?h=for-4.15-fixes&id=e8b3f8db7aad99fcc5234fc5b89984ff6620de3d
> 
> 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.