linux-kernel - Re: [PATCH 3/4] coredump: ELF-FDPIC: enable to omit anonymous shared memory

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Message-ID: <32247.1172144838@redhat.com>
Date:	Thu, 22 Feb 2007 11:47:18 +0000
From:	David Howells <dhowells@...hat.com>
To:	"Kawai, Hidehiro" <hidehiro.kawai.ez@...achi.com>
Cc:	Robin Holt <holt@....com>, Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <soshima@...hat.com>,
	"Hideo AOKI@...hat" <haoki@...hat.com>
Subject: Re: [PATCH 3/4] coredump: ELF-FDPIC: enable to omit anonymous shared memory 

Kawai, Hidehiro <hidehiro.kawai.ez@...achi.com> wrote:

> Okay, the probability that the process is blocked in the proc handler seems
> to be small.  But I'm not sure if problems never occur in enterprise use.
> So I'd like to use down_write_trylock() as Robin said before. And if it
> fails to acquire the lock, it returns EBUSY immediately.
> Do you have any comments?

That's probably reasonable, but that means userspace then has to handle EBUSY.

David
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