linux-kernel - Re: [RFC][PATCH] make global bitlock waitqueues per-node

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Message-ID: <20161221080931.GQ3124@twins.programming.kicks-ass.net>
Date:   Wed, 21 Dec 2016 09:09:31 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Bob Peterson <rpeterso@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH] make global bitlock waitqueues per-node

On Tue, Dec 20, 2016 at 10:02:46AM -0800, Linus Torvalds wrote:
> On Tue, Dec 20, 2016 at 9:31 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > I'll go back and try to see why the page flag contention patch didn't
> > get applied.
> 
> Ahh, a combination of warring patches by Nick and PeterZ, and worry
> about the page flag bits.

I think Nick actually had a patch freeing up a pageflag, although Hugh
had a comment on that.

That said, I'm not a huge fan of his waiters patch, I'm still not sure
why he wants to write another whole wait loop, but whatever. Whichever
you prefer I suppose.