From mboxrd@z Thu Jan  1 00:00:00 1970
From: Edward Shishkin <edward.shishkin@gmail.com>
Subject: Re: Kernel config option which causes reiser4 to be instable
Date: Tue, 11 Dec 2012 19:33:39 +0100
Message-ID: <50C77C83.4080402@gmail.com>
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To: Ivan Shapovalov <intelfx100@gmail.com>
Cc: reiserfs-devel <reiserfs-devel@vger.kernel.org>, =?UTF-8?B?RHXFoWFuIMSM?= =?UTF-8?B?b2xpxIc=?= <dusanc@gmail.com>

On 12/11/2012 04:08 PM, Ivan Shapovalov wrote:
> Hello!

Hello.

>
> With help of Du=C5=A1an =C4=8Coli=C4=87 <dusanc@gmail.com> who provid=
ed his kernel config
> diff I've found a kernel option which, when disabled, greatly reduces
> (hopefully to zero, but need time to verify it) corruption rate in re=
iser4.
>
> It's CONFIG_TRANSPARENT_HUGEPAGE (or something which is used by it li=
ke
> CONFIG_COMPACTION or CONFIG_MIGRATION).
> For now I'm testing it with CONFIG_TRANSPARENT_HUGEPAGE disabled

How long?

>   on kernel
> 3.6.10, and everything seems to be OK so far (so the workaround is ve=
rsion-
> agnostic).
>
> Edward, are there any guesses on what can make reiser4 choke on
> hugepages/compaction/migration?

TBH, no ideas. They (hugepages) are _transparent_.
It means we shouldn't suffer in theory ;)

>   I'm not even barely familiar with the kernel
> internals.
>
> Thanks,
> Ivan.
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