From: Nick Piggin <npiggin@suse.de>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
Hugh Dickins <hugh@veritas.com>,
Christoph Lameter <cl@linux-foundation.org>
Subject: Re: [patch] mm: page allocator minor speedup
Date: Tue, 19 Aug 2008 09:49:11 +0200 [thread overview]
Message-ID: <20080819074911.GA10447@wotan.suse.de> (raw)
In-Reply-To: <84144f020808180657v2bdd5f76l4b0f1897c73ec0c0@mail.gmail.com>
On Mon, Aug 18, 2008 at 04:57:00PM +0300, Pekka Enberg wrote:
> Hi Nick,
>
> On Mon, Aug 18, 2008 at 3:29 PM, Nick Piggin <npiggin@suse.de> wrote:
> > Now that we don't put a ZERO_PAGE in the pagetables any more, and the
> > "remove PageReserved from core mm" patch has had a long time to mature,
> > let's remove the page reserved logic from the allocator.
> >
> > This saves several branches and about 100 bytes in some important paths.
>
> Cool. Any numbers for this?
No, no numbers. I expect it would be very difficult to measure because
it probably only starts saving cycles when the workload exceeds L1I and/or
the branch caches.
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next prev parent reply other threads:[~2008-08-19 7:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-18 12:24 [patch] mm: pagecache insertion fewer atomics Nick Piggin
2008-08-18 12:25 ` [patch] mm: unlockless reclaim Nick Piggin
2008-08-19 5:09 ` KOSAKI Motohiro
2008-08-19 10:05 ` Nick Piggin
2008-08-19 10:20 ` KOSAKI Motohiro
2008-08-18 12:28 ` [patch] mm: page lock use lock bitops Nick Piggin
2008-08-18 12:29 ` [patch] fs: buffer " Nick Piggin
2008-08-18 12:29 ` [patch] mm: page allocator minor speedup Nick Piggin
2008-08-18 13:57 ` Pekka Enberg
2008-08-19 7:49 ` Nick Piggin [this message]
2008-08-19 7:51 ` Pekka Enberg
2008-08-19 10:25 ` Nick Piggin
2008-08-18 23:29 ` Andrew Morton
2008-08-19 7:51 ` Nick Piggin
2008-10-14 15:52 ` Hugh Dickins
2008-10-15 4:37 ` Nick Piggin
2008-08-19 5:41 ` [patch] mm: pagecache insertion fewer atomics KOSAKI Motohiro
2008-08-19 5:50 ` Andrew Morton
2008-08-19 10:07 ` Nick Piggin
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