From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Yang Shi <yang.shi@linux.alibaba.com>
Cc: mgorman@techsingularity.net, adilger.kernel@dilger.ca,
darrick.wong@oracle.com, dchinner@redhat.com,
akpm@linux-foundation.org, linux-ext4@vger.kernel.org,
linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] fs: ext4: use BUG_ON if writepage call comes from direct reclaim
Date: Tue, 3 Jul 2018 06:39:48 -0400 [thread overview]
Message-ID: <20180703103948.GB27426@thunk.org> (raw)
In-Reply-To: <1530591079-33813-1-git-send-email-yang.shi@linux.alibaba.com>
On Tue, Jul 03, 2018 at 12:11:18PM +0800, Yang Shi wrote:
> direct reclaim doesn't write out filesystem page, only kswapd could do
> it. So, if the call comes from direct reclaim, it is definitely a bug.
>
> And, Mel Gormane also mentioned "Ultimately, this will be a BUG_ON." In
> commit 94054fa3fca1fd78db02cb3d68d5627120f0a1d4 ("xfs: warn if direct
> reclaim tries to writeback pages").
>
> Although it is for xfs, ext4 has the similar behavior, so elevate
> WARN_ON to BUG_ON.
>
> And, correct the comment accordingly.
>
> Cc: Mel Gorman <mgorman@techsingularity.net>
> Cc: "Theodore Ts'o" <tytso@mit.edu>
> Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
What's the upside of crashing the kernel if the file sytsem can handle it?
- Ted
next prev parent reply other threads:[~2018-07-03 10:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-03 4:11 [PATCH 1/2] fs: ext4: use BUG_ON if writepage call comes from direct reclaim Yang Shi
2018-07-03 4:11 ` [PATCH 2/2] fs: xfs: " Yang Shi
2018-07-03 4:37 ` Dave Chinner
2018-07-03 17:19 ` Darrick J. Wong
2018-07-03 10:39 ` Theodore Y. Ts'o [this message]
2018-07-03 17:05 ` [PATCH 1/2] fs: ext4: " Yang Shi
2018-07-03 23:10 ` Yang Shi
2018-07-03 23:43 ` Theodore Y. Ts'o
2018-07-04 14:03 ` Michal Hocko
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