From: Nick Piggin <npiggin@suse.de>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Andrew Morton <akpm@osdl.org>,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [patch 4/9] mm: lockless pagecache lookups
Date: Sat, 23 Sep 2006 04:35:36 +0200 [thread overview]
Message-ID: <20060923023536.GD23015@wotan.suse.de> (raw)
In-Reply-To: <1158955271.5584.58.camel@localhost>
On Fri, Sep 22, 2006 at 04:01:11PM -0400, Lee Schermerhorn wrote:
> 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?
Yep, thanks
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next prev parent reply other threads:[~2006-09-23 2:35 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
2006-09-23 2:35 ` Nick Piggin [this message]
2006-09-22 19:24 ` [patch 0/4] lockless pagecache for 2.6.18-rc7-mm1 Nick Piggin
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