linux-kernel - Re: [BUG] Lockless patches cause hardlock under heavy IO

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Message-Id: <1213863122.16944.257.camel@twins>
Date:	Thu, 19 Jun 2008 10:12:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ryan Hope <rmh3093@...il.com>
Cc:	linux-mm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [BUG] Lockless patches cause hardlock under heavy IO

On Wed, 2008-06-18 at 17:15 -0400, Ryan Hope wrote:
> I applied the following patches from 2.6-26-rc5-mm3 to 2.6.26-rc6 and
> they caused a hardlock under heavy IO:

What kind of machine, how much memory, how many spindles, what
filesystem and what is heavy load?

Furthermore, try the NMI watchdog with serial/net-console to capture its
output.

> x86-implement-pte_special.patch
> mm-introduce-get_user_pages_fast.patch
> mm-introduce-get_user_pages_fast-fix.patch
> mm-introduce-get_user_pages_fast-checkpatch-fixes.patch
> x86-lockless-get_user_pages_fast.patch
> x86-lockless-get_user_pages_fast-checkpatch-fixes.patch
> x86-lockless-get_user_pages_fast-fix.patch
> x86-lockless-get_user_pages_fast-fix-2.patch
> x86-lockless-get_user_pages_fast-fix-2-fix-fix.patch
> x86-lockless-get_user_pages_fast-fix-warning.patch
> dio-use-get_user_pages_fast.patch
> splice-use-get_user_pages_fast.patch
> x86-support-1gb-hugepages-with-get_user_pages_lockless.patch
> #
> mm-readahead-scan-lockless.patch
> radix-tree-add-gang_lookup_slot-gang_lookup_slot_tag.patch
> #mm-speculative-page-references.patch: clameter saw bustage
> mm-speculative-page-references.patch
> mm-speculative-page-references-fix.patch
> mm-speculative-page-references-fix-fix.patch
> mm-speculative-page-references-hugh-fix3.patch
> mm-lockless-pagecache.patch
> mm-spinlock-tree_lock.patch
> powerpc-implement-pte_special.patch
> 
> I am on an x86_64. I dont know what other info you need...


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