linux-kernel - Re: [RFC 2/2] x86_64: expand kernel stack to 16K

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Message-ID: <CA+55aFxni7MFPqdNh7LFssAaLLPP0nuvx-6OSdAU3vEqEdmWPw@mail.gmail.com>
Date:	Thu, 29 May 2014 18:30:26 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Dave Chinner <david@...morbit.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC 2/2] x86_64: expand kernel stack to 16K

On Thu, May 29, 2014 at 5:05 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So maybe test a patch something like the attached.
>
> NOTE! This is absolutely TOTALLY UNTESTED!

It's still untested, but I realized that the whole
"blk_flush_plug_list(plug, true);" thing is pointless, since
schedule() itself will do that for us.

So I think you can remove the

+       struct blk_plug *plug = current->plug;
+       if (plug)
+               blk_flush_plug_list(plug, true);

part from congestion_timeout().

Not that it should *hurt* to have it there, so I'm not bothering to
send a changed patch.

And again, no actual testing by me on any of this, just looking at the code.

           Linus
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