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Subject: Re: [PATCH v4 3.0-rc2-tip 2/22]  2: uprobes: Breakground page
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From: Peter Zijlstra <peterz@infradead.org>
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Date: Tue, 14 Jun 2011 15:01:17 +0200
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To: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>, Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Hugh Dickins <hughd@google.com>, Christoph Hellwig <hch@infradead.org>, Andi Kleen <andi@firstfloor.org>, Thomas Gleixner <tglx@linutronix.de>, Jonathan Corbet <corbet@lwn.net>, Andrew Morton <akpm@linux-foundation.org>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, LKML <linux-kernel@vger.kernel.org>

On Mon, 2011-06-13 at 19:00 +0200, Oleg Nesterov wrote:
>=20
> Also. This is called under down_read(mmap_sem), can't we race with
> access_process_vm() modifying the same memory?

Shouldn't matter COW and similar things are serialized using the pte
lock.

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