linux-kernel - Re: kernel 3.0: BUG: soft lockup: find_get

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Message-ID: <CA+55aFwf75oJ3JJ2aCR8TJJm_oLireD6SDO+43GveVVb8vGw1w@mail.gmail.com>
Date:	Wed, 19 Oct 2011 06:39:55 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Pawel Sikora <pluto@...k.net>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	jpiszcz@...idpixels.com, arekm@...-linux.org,
	linux-kernel@...r.kernel.org
Subject: Re: kernel 3.0: BUG: soft lockup: find_get_pages+0x51/0x110

On Wed, Oct 19, 2011 at 12:43 AM, Mel Gorman <mgorman@...e.de> wrote:
>
> My vote is with the migration change. While there are occasionally
> patches to make migration go faster, I don't consider it a hot path.
> mremap may be used intensively by JVMs so I'd loathe to hurt it.

Ok, everybody seems to like that more, and it removes code rather than
adds it, so I certainly prefer it too. Paweł, can you test that other
patch (to mm/migrate.c) that Hugh posted? Instead of the mremap vma
locking patch that you already verified for your setup?

Hugh - that one didn't have a changelog/sign-off, so if you could
write that up, and Paweł's testing is successful, I can apply it...
Looks like we have acks from both Andrea and Mel.

                  Linus
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