From: Hugh Dickins <hugh@veritas.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linux-mm@kvack.org,
Linux Kernel list <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@osdl.org>,
Mike Waychison <mikew@google.com>
Subject: Re: [RFC] page fault retry with NOPAGE_RETRY
Date: Fri, 15 Sep 2006 14:30:24 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.64.0609151425050.22674@blonde.wat.veritas.com> (raw)
In-Reply-To: <20060915003529.8a59c542.akpm@osdl.org>
On Fri, 15 Sep 2006, Andrew Morton wrote:
>
> This assumes that no other heavyweight process will try to modify this
> single-threaded process's mm. I don't _think_ that happens anywhere, does
> it? access_process_vm() is the only case I can think of,
"Modify" in the sense of fault into.
Yes, access_process_vm() is all I can think of too.
> and it does down_read(other process's mmap_sem).
If there were anything else, it'd have to do so too (if not down_write).
I too like NOPAGE_RETRY: as you've both observed, it can help to solve
several different problems.
Hugh
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next prev parent reply other threads:[~2006-09-15 13:30 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-14 22:55 Benjamin Herrenschmidt
2006-09-15 0:19 ` Linus Torvalds
2006-09-15 7:11 ` Andrew Morton
2006-09-15 7:35 ` Andrew Morton
2006-09-15 13:30 ` Hugh Dickins [this message]
2006-09-16 1:03 ` Benjamin Herrenschmidt
2006-09-19 23:35 ` Mike Waychison
2006-09-19 23:50 ` Benjamin Herrenschmidt
2006-09-19 23:59 ` Andrew Morton
2006-09-20 0:06 ` Benjamin Herrenschmidt
2006-09-20 0:05 ` Benjamin Herrenschmidt
2006-09-20 0:21 ` Andrew Morton
2006-09-20 1:57 ` Benjamin Herrenschmidt
2006-09-20 3:05 ` Andrew Morton
2006-09-20 5:04 ` Benjamin Herrenschmidt
2006-09-20 5:26 ` Andrew Morton
2006-09-20 6:54 ` Benjamin Herrenschmidt
2006-09-20 17:53 ` Andrew Morton
2006-09-21 22:05 ` Benjamin Herrenschmidt
2006-09-21 22:41 ` Andrew Morton
2006-09-21 23:09 ` Benjamin Herrenschmidt
2006-09-23 14:21 ` Hugh Dickins
2006-09-23 19:46 ` Andrew Morton
2006-09-23 22:35 ` Benjamin Herrenschmidt
2006-09-20 5:06 ` Benjamin Herrenschmidt
2006-09-20 1:14 ` Mike Waychison
2006-09-20 2:02 ` Benjamin Herrenschmidt
2006-09-15 21:35 ` Arnd Bergmann
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