From: Andi Kleen <ak@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-kernel@vger.kernel.org, hugh@veritas.com,
nickpiggin@yahoo.com.au, linux-mm@kvack.org,
marcelo.tosatti@cyclades.com
Subject: Re: [PATCH 01/14] Per zone counter functionality
Date: Fri, 9 Jun 2006 06:38:28 +0200 [thread overview]
Message-ID: <200606090638.28167.ak@suse.de> (raw)
In-Reply-To: <20060608210045.62129826.akpm@osdl.org>
On Friday 09 June 2006 06:00, Andrew Morton wrote:
> On Thu, 8 Jun 2006 16:02:44 -0700 (PDT)
> Christoph Lameter <clameter@sgi.com> wrote:
>
> > Per zone counter infrastructure
> >
>
> Is the use of 8-bit accumulators more efficient than using 32-bit ones?
> Obviously it's better from a cache POV, given that we have a pretty large
> array of them. But is there a downside on some architectures in not using
> the natural wordsize?
Maybe on very old alphas which didn't have 8 bit stores. They need a RMW cycle.
Other than that i wouldn't expect any problems. RISCs will just do the usual
32bit add in registers, but do a 8bit load/store.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-kernel@vger.kernel.org, hugh@veritas.com,
nickpiggin@yahoo.com.au, linux-mm@kvack.org,
marcelo.tosatti@cyclades.com
Subject: Re: [PATCH 01/14] Per zone counter functionality
Date: Fri, 9 Jun 2006 06:38:28 +0200 [thread overview]
Message-ID: <200606090638.28167.ak@suse.de> (raw)
In-Reply-To: <20060608210045.62129826.akpm@osdl.org>
On Friday 09 June 2006 06:00, Andrew Morton wrote:
> On Thu, 8 Jun 2006 16:02:44 -0700 (PDT)
> Christoph Lameter <clameter@sgi.com> wrote:
>
> > Per zone counter infrastructure
> >
>
> Is the use of 8-bit accumulators more efficient than using 32-bit ones?
> Obviously it's better from a cache POV, given that we have a pretty large
> array of them. But is there a downside on some architectures in not using
> the natural wordsize?
Maybe on very old alphas which didn't have 8 bit stores. They need a RMW cycle.
Other than that i wouldn't expect any problems. RISCs will just do the usual
32bit add in registers, but do a 8bit load/store.
-Andi
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next prev parent reply other threads:[~2006-06-09 4:38 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-08 23:02 [PATCH 00/14] Zoned VM counters V2 Christoph Lameter
2006-06-08 23:02 ` Christoph Lameter
2006-06-08 23:02 ` [PATCH 01/14] Per zone counter functionality Christoph Lameter
2006-06-08 23:02 ` Christoph Lameter
2006-06-09 4:00 ` Andrew Morton
2006-06-09 4:00 ` Andrew Morton
2006-06-09 4:38 ` Andi Kleen [this message]
2006-06-09 4:38 ` Andi Kleen
2006-06-09 9:22 ` Peter Zijlstra
2006-06-09 9:22 ` Peter Zijlstra
2006-06-09 9:29 ` Andrew Morton
2006-06-09 9:29 ` Andrew Morton
2006-06-09 18:19 ` Horst von Brand
2006-06-09 18:19 ` Horst von Brand
2006-06-09 15:54 ` Christoph Lameter
2006-06-09 15:54 ` Christoph Lameter
2006-06-09 17:06 ` Andrew Morton
2006-06-09 17:06 ` Andrew Morton
2006-06-09 17:18 ` Christoph Lameter
2006-06-09 17:18 ` Christoph Lameter
2006-06-09 17:38 ` Andrew Morton
2006-06-09 17:38 ` Andrew Morton
2006-06-09 4:28 ` Andi Kleen
2006-06-09 4:28 ` Andi Kleen
2006-06-09 16:00 ` Christoph Lameter
2006-06-09 16:00 ` Christoph Lameter
2006-06-08 23:02 ` [PATCH 02/14] Include per zone counters in /proc/vmstat Christoph Lameter
2006-06-08 23:02 ` Christoph Lameter
2006-06-08 23:02 ` [PATCH 03/14] Conversion of nr_mapped to per zone counter Christoph Lameter
2006-06-08 23:02 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 04/14] Conversion of nr_pagecache " Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 04/14] Use per zone counters to remove zone_reclaim_interval Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-09 4:00 ` Andrew Morton
2006-06-09 4:00 ` Andrew Morton
2006-06-09 18:54 ` zoned VM stats: Add NR_ANON Christoph Lameter
2006-06-09 18:54 ` Christoph Lameter
2006-06-10 4:32 ` KAMEZAWA Hiroyuki
2006-06-10 4:32 ` KAMEZAWA Hiroyuki
2006-06-10 4:52 ` Christoph Lameter
2006-06-10 4:52 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 06/14] Add per zone counters to zone node and global VM statistics Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-09 4:01 ` Andrew Morton
2006-06-09 4:01 ` Andrew Morton
2006-06-09 15:55 ` Christoph Lameter
2006-06-09 15:55 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 07/14] Conversion of nr_slab to per zone counter Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 08/14] Conversion of nr_pagetable " Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 09/14] Conversion of nr_dirty " Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 10/14] Conversion of nr_writeback " Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 11/14] Conversion of nr_unstable " Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 12/14] Remove unused get_page_stat functions Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 13/14] Conversion of nr_bounce to per zone counter Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
2006-06-08 23:03 ` [PATCH 14/14] Remove useless writeback structure Christoph Lameter
2006-06-08 23:03 ` Christoph Lameter
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