linux-kernel - Re: Possible memory allocation deadlock in kmem_alloc and hung task in xfs_log_commit_cil and xlog_cil

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Message-ID: <20150709015825.GG3902@dastard>
Date:	Thu, 9 Jul 2015 11:58:25 +1000
From:	Dave Chinner <david@...morbit.com>
To:	juncheng bai <baijuncheng@...tedstack.com>
Cc:	Gavin Guo <gavin.guo@...onical.com>,
	linux-kernel <linux-kernel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: Possible memory allocation deadlock in kmem_alloc and hung task
 in xfs_log_commit_cil and xlog_cil_push

On Wed, Jul 08, 2015 at 10:06:10PM +0800, juncheng bai wrote:
> Hi, All
> 
> As far as I know, the patch b3f03bac8132207a20286d5602eda64500c19724
> solves one case which big directory size.
> 
> I am not very familiar with xfs, but I think why can't we use vmalloc
> when kmalloc fails?

Because vmalloc space is greatly limited on 32 bit machines and
hence we can't just use vmalloc blindly in these situations.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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