From: Con Kolivas <kernel@kolivas.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org,
Hugh Dickins <hugh@veritas.com>,
Marcelo Tosatti <marcelo@kvack.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
linux-mm@kvack.org, Andi Kleen <ak@suse.de>,
Dave Chinner <dgc@sgi.com>
Subject: Re: [PATCH 19/21] swap_prefetch: Conversion of nr_unstable to ZVC
Date: Tue, 13 Jun 2006 09:57:27 +1000 [thread overview]
Message-ID: <200606130957.28414.kernel@kolivas.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0606121647090.22052@schroedinger.engr.sgi.com>
On Tuesday 13 June 2006 09:48, Christoph Lameter wrote:
> On Tue, 13 Jun 2006, Con Kolivas wrote:
> > Nack. You're changing some other code unintentionally.
>
> Is this okay?
Not quite.
Remove the test_pagestate variable entirely and leave the check something
like:
if (!(sp_stat.prefetched_pages % SWAP_CLUSTER_MAX) &&
above_background_load())
goto out;
Thanks
>
> Subject: swap_prefetch: conversion of nr_unstable to per zone counter
> From: Christoph Lameter <clameter@sgi.com>
>
> The determination of the vm state is now not that expensive
> anymore after we remove the use of the page state.
> Remove the logic to avoid the expensive checks.
>
> Signed-off-by: Christoph Lameter <clameter@sgi.com>
> Signed-off-by: Andrew Morton <akpm@osdl.org>
>
> Index: linux-2.6.17-rc6-cl/mm/swap_prefetch.c
> ===================================================================
> --- linux-2.6.17-rc6-cl.orig/mm/swap_prefetch.c 2006-06-12
> 13:37:47.283159568 -0700 +++
> linux-2.6.17-rc6-cl/mm/swap_prefetch.c 2006-06-12 16:46:48.504626417 -0700
> @@ -357,7 +357,6 @@ static int prefetch_suitable(void)
> */
> for_each_node_mask(node, sp_stat.prefetch_nodes) {
> struct node_stats *ns = &sp_stat.node[node];
> - struct page_state ps;
>
> /*
> * We check to see that pages are not being allocated
> @@ -375,11 +374,6 @@ static int prefetch_suitable(void)
> } else
> ns->last_free = ns->current_free;
>
> - if (!test_pagestate)
> - continue;
> -
> - get_page_state_node(&ps, node);
> -
> /* We shouldn't prefetch when we are doing writeback */
> if (node_page_state(node, NR_WRITEBACK)) {
> node_clear(node, sp_stat.prefetch_nodes);
> @@ -394,7 +388,8 @@ static int prefetch_suitable(void)
> node_page_state(node, NR_ANON) +
> node_page_state(node, NR_SLAB) +
> node_page_state(node, NR_DIRTY) +
> - ps.nr_unstable + total_swapcache_pages;
> + node_page_state(node, NR_UNSTABLE) +
> + total_swapcache_pages;
> if (limit > ns->prefetch_watermark) {
> node_clear(node, sp_stat.prefetch_nodes);
> continue;
--
-ck
--
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next prev parent reply other threads:[~2006-06-12 23:57 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-12 21:12 [PATCH 00/21] Zoned VM counters V3 Christoph Lameter
2006-06-12 21:12 ` [PATCH 01/21] Create vmstat.c/.h from page_alloc.c/.h Christoph Lameter
2006-06-12 21:12 ` [PATCH 02/21] Basic ZVC (zoned vm counter) implementation, zoned vm counters: per zone counter functionality Christoph Lameter, Christoph Lameter
2006-06-13 5:37 ` Nick Piggin
2006-06-13 15:55 ` Christoph Lameter
2006-06-14 1:21 ` Nick Piggin
2006-06-14 5:37 ` Hugh Dickins
2006-06-14 5:53 ` Andi Kleen
2006-06-14 16:14 ` Christoph Lameter
2006-06-12 21:13 ` [PATCH 03/21] Convert nr_mapped to per zone counter, zoned vm counters: conversion of nr_mapped to per zone counter Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 04/21] swap_prefetch: Convert nr_mapped to ZVC Christoph Lameter
2006-06-12 23:36 ` Con Kolivas
2006-06-12 21:13 ` [PATCH 05/21] Conversion of nr_pagecache to per zone counter, zoned vm counters: conversion of nr_pagecache to per zone counter Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 06/21] Remove nr_mapped from scan controls structure, zoned VM stats: Remove nr_mapped from scan control Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 07/21] Split NR_ANON off from NR_MAPPED, zoned VM stats: Add NR_ANON Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 08/21] swap_prefetch: Split NR_ANON off NR_MAPPED Christoph Lameter
2006-06-12 23:36 ` Con Kolivas
2006-06-12 21:13 ` [PATCH 09/21] zone_reclaim: remove /proc/sys/vm/zone_reclaim_interval, zoned vm counters: use per zone counters to remove zone_reclaim_interval Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 10/21] Conversion of nr_slab to per zone counter, zoned vm counters: conversion of nr_slab to per zone counter Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 11/21] swap_prefetch: Conversion of nr_slab to ZVC Christoph Lameter
2006-06-12 21:13 ` [PATCH 12/21] Conversion of nr_pagetables to per zone counter, zoned vm counters: conversion of nr_pagetable to per zone counter Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 13/21] Conversion of nr_dirty to per zone counter, zoned vm counters: conversion of nr_dirty " Christoph Lameter, Christoph Lameter
2006-06-12 21:13 ` [PATCH 14/21] swap_prefetch: Conversion of nr_dirty to ZVC Christoph Lameter
2006-06-12 23:38 ` Con Kolivas
2006-06-12 21:14 ` [PATCH 15/21] reiser4: Conversiion of nr_dirty to ZVC, reiser4: conversion of nr_dirty to per zone counter Christoph Lameter, Christoph Lameter
2006-06-12 21:14 ` [PATCH 16/21] Conversion of nr_writeback to per zone counter, zoned vm counters: conversion of nr_writeback " Christoph Lameter, Christoph Lameter
2006-06-12 21:14 ` [PATCH 17/21] swap_prefetch: Conversion of nr_writeback to ZVC, swap_prefetch: " Christoph Lameter, Christoph Lameter
2006-06-12 23:38 ` [PATCH 17/21] swap_prefetch: Conversion of nr_writeback to ZVC Con Kolivas
2006-06-12 21:14 ` [PATCH 18/21] Conversion of nr_unstable to per zone counter, zoned vm counters: conversion of nr_unstable to per zone counter Christoph Lameter, Christoph Lameter
2006-06-12 21:14 ` [PATCH 19/21] swap_prefetch: Conversion of nr_unstable to ZVC, swap_prefetch: " Christoph Lameter, Christoph Lameter
2006-06-12 23:40 ` [PATCH 19/21] swap_prefetch: Conversion of nr_unstable to ZVC Con Kolivas
2006-06-12 23:48 ` Christoph Lameter
2006-06-12 23:57 ` Con Kolivas [this message]
2006-06-12 23:59 ` Con Kolivas
2006-06-13 0:08 ` Christoph Lameter
2006-06-13 0:19 ` Con Kolivas
2006-06-12 21:14 ` [PATCH 20/21] Conversion of nr_bounce to per zone counter, zoned vm counters: conversion of nr_bounce to per zone counter Christoph Lameter, Christoph Lameter
2006-06-12 21:14 ` [PATCH 21/21] Remove useless struct wbs, zoned vm counters: remove useless writeback structure Christoph Lameter, Christoph Lameter
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