linux-kernel - Re: [PATCH 4/6] psi: introduce state_mask to represent stalled psi states

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Message-ID: <20181218101727.GA15430@hirez.programming.kicks-ass.net>
Date:   Tue, 18 Dec 2018 11:17:27 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, lizefan@...wei.com,
        Johannes Weiner <hannes@...xchg.org>, axboe@...nel.dk,
        dennis@...nel.org, Dennis Zhou <dennisszhou@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
        linux-mm <linux-mm@...ck.org>, linux-doc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@...roid.com
Subject: Re: [PATCH 4/6] psi: introduce state_mask to represent stalled psi
 states

On Mon, Dec 17, 2018 at 05:14:53PM -0800, Suren Baghdasaryan wrote:
> On Mon, Dec 17, 2018 at 7:55 AM Peter Zijlstra <peterz@...radead.org> wrote:
> > > +             if (state_mask & (1 << s))
> >
> > We have the BIT() macro, but I'm honestly not sure that will improve
> > things.
> 
> I was mimicking the rest of the code in psi.c that uses this kind of
> bit masking. Can change if you think that would be better.

Yeah, I really don't know.. keep it as is I suppose.