linux-kernel - Re: [PATCH] coredump: Retry writes where appropriate

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Message-ID: <20090531111851.07eb1df3@lxorguk.ukuu.org.uk>
Date:	Sun, 31 May 2009 11:18:51 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	paul@...-scientist.net
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH] coredump: Retry writes where appropriate

On Sun, 31 May 2009 01:33:39 -0400
Paul Smith <paul@...-scientist.net> wrote:

> coredump: Retry writes where appropriate
> 
> Core dump write operations (especially to a pipe) can be incomplete due
> to signal reception or possibly recoverable partial writes.

NAK this

> Previously any incomplete write in the ELF core dumper caused the core
> dump to stop, giving short cores in these cases.  Modify the core dumper
> to retry the write where appropriate.

The existing behaviour is an absolute godsend when you've something like
a core dump stuck on an NFS mount or something trying to core dump to
very slow media.

In fact the signals checks were *purposefully added* some time ago.

Alan
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