From: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
To: Nick Piggin <npiggin@suse.de>
Cc: Andrew Morton <akpm@osdl.org>,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [patch 4/9] mm: lockless pagecache lookups
Date: Fri, 22 Sep 2006 16:01:11 -0400 [thread overview]
Message-ID: <1158955271.5584.58.camel@localhost> (raw)
In-Reply-To: <20060922172120.22370.4933.sendpatchset@linux.site>
On Fri, 2006-09-22 at 21:22 +0200, Nick Piggin wrote:
> Combine page_cache_get_speculative with lockless radix tree lookups to
> introduce lockless page cache lookups (ie. no mapping->tree_lock on
> the read-side).
>
> The only atomicity changes this introduces is that the gang pagecache
> lookup functions now behave as if they are implemented with multiple
> find_get_page calls, rather than operating on a snapshot of the pages.
> In practice, this atomicity guarantee is not used anyway, and it is
> difficult to see how it could be. Gang pagecache lookups are designed
> to replace individual lookups, so these semantics are natural.
>
vvv - stale comment?
> Swapcache can no longer use find_get_page, because it has a different
> method of encoding swapcache position into the page. Introduce a new
> find_get_swap_page for it.
^^^
>
<snip>
--
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:[~2006-09-22 20:01 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-22 19:22 [patch 0/4] lockless pagecache for 2.6.18-rc7-mm1 Nick Piggin
2006-09-22 19:22 ` [patch 2/4] radix-tree: use indirect bit Nick Piggin
2006-09-22 19:22 ` [patch 2/9] radix-tree: gang_lookup_slot Nick Piggin
2006-09-22 19:22 ` [patch 3/9] mm: speculative get page Nick Piggin
2006-09-23 10:01 ` Peter Zijlstra
2006-09-24 18:01 ` Hugh Dickins
2006-09-25 2:00 ` Nick Piggin
2006-09-25 11:47 ` Nick Piggin
2006-09-25 13:04 ` Peter Zijlstra
2006-09-25 22:41 ` Nick Piggin
2006-09-22 19:22 ` [patch 4/9] mm: lockless pagecache lookups Nick Piggin
2006-09-22 20:01 ` Lee Schermerhorn [this message]
2006-09-23 2:35 ` Nick Piggin
2006-09-22 19:24 ` [patch 0/4] lockless pagecache for 2.6.18-rc7-mm1 Nick Piggin
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=1158955271.5584.58.camel@localhost \
--to=lee.schermerhorn@hp.com \
--cc=akpm@osdl.org \
--cc=linux-mm@kvack.org \
--cc=npiggin@suse.de \
/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