From: Andrew Morton <akpm@osdl.org>
To: 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 00:35:29 -0700 [thread overview]
Message-ID: <20060915003529.8a59c542.akpm@osdl.org> (raw)
In-Reply-To: <20060915001151.75f9a71b.akpm@osdl.org>
On Fri, 15 Sep 2006 00:11:51 -0700
Andrew Morton <akpm@osdl.org> wrote:
> b) It could be more efficient. Most of the time, there's no need to
> back all the way out of the pagefault handler and rerun the whole thing.
> Because most of the time, nobody changed anything in the mm_struct. We
> _could_ just retake the mmap_sem after the page comes uptodate and, if
> nothing has changed, proceed. I see two ways of doing this:
>
> - The simple way: look to see if any other processes are sharing
> this mm_struct. If not, just do the synchronous read inside mmap_sem.
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, and it does
down_read(other process's mmap_sem).
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2006-09-15 7:35 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-14 22:55 [RFC] page fault retry with NOPAGE_RETRY Benjamin Herrenschmidt
2006-09-15 0:19 ` Linus Torvalds
2006-09-15 7:11 ` Andrew Morton
2006-09-15 7:35 ` Andrew Morton [this message]
2006-09-15 13:30 ` Hugh Dickins
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20060915003529.8a59c542.akpm@osdl.org \
--to=akpm@osdl.org \
--cc=benh@kernel.crashing.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mikew@google.com \
--cc=torvalds@osdl.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox