From: Christoph Lameter <clameter@sgi.com>
To: Martin Bligh <mbligh@google.com>
Cc: akpm@osdl.org, linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH 00/14] Zoned VM counters V5
Date: Wed, 21 Jun 2006 10:16:00 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0606211012590.20071@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <44997D9E.8040304@google.com>
On Wed, 21 Jun 2006, Martin Bligh wrote:
> > Yes later patches also use the counters for other things. Please check out
> > the patch that uses these for numa counters etc.
>
> OK, but looked like the original implementation was sort of tied to
> zones / the VM, at least in terminology, and code placement. I'll look
> at it again ...
Yes it is. This one is useful only for zone related information.
> > Also smaller counters help keep the pcp structure in one cacheline and
> > reduces the cache footprint.
>
> Sure, but for a normal sized system, the smaller the per-cpu portion,
> the more atomic ops you'll end up doing, surely?
So we now do two atomic ops for every 32 increments (threshold). If we
increment the threshhold then we reduce the atomic overhead but this also
influences the inaccurary of the global and per zone counter because
there is the potential of more counter update deferrals. Keeping the
threshold low makes the global and per zone counter more up to date.
I think 32 is a good compromise.
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next prev parent reply other threads:[~2006-06-21 17:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-21 15:44 Christoph Lameter
2006-06-21 15:44 ` [PATCH 01/14] Create vmstat.c/.h from page_alloc.c/.h Christoph Lameter
2006-06-21 15:44 ` [PATCH 02/14] Basic ZVC (zoned vm counter) implementation, zoned vm counters: per zone counter functionality Christoph Lameter, Christoph Lameter
[not found] ` <20060622041034.84b3c997.akpm@osdl.org>
2006-06-22 14:54 ` [PATCH 02/14] Basic ZVC (zoned vm counter) implementation Christoph Lameter
2006-06-21 15:44 ` [PATCH 03/14] Convert nr_mapped to per zone counter, zoned vm counters: conversion of nr_mapped to per zone counter Christoph Lameter, Christoph Lameter
2006-06-21 15:44 ` [PATCH 04/14] Conversion of nr_pagecache to per zone counter, zoned vm counters: conversion of nr_pagecache " Christoph Lameter, Christoph Lameter
2006-06-21 15:44 ` [PATCH 05/14] Remove NR_FILE_MAPPED from scan control structure, zoned VM stats: Remove nr_mapped from scan control Christoph Lameter, Christoph Lameter
2006-06-21 15:44 ` [PATCH 06/14] Split NR_ANON_PAGES off from NR_FILE_MAPPED, zoned VM stats: Add NR_ANON_PAGES Christoph Lameter, Christoph Lameter
[not found] ` <44996F34.1010805@google.com>
2006-06-21 17:01 ` [PATCH 06/14] Split NR_ANON_PAGES off from NR_FILE_MAPPED Christoph Lameter
2006-06-21 15:44 ` [PATCH 07/14] 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
2006-06-21 15:45 ` [PATCH 08/14] Conversion of nr_slab to per zone counter, zoned vm counters: conversion of nr_slab to per zone counter Christoph Lameter, Christoph Lameter
2006-06-21 15:45 ` [PATCH 09/14] Conversion of nr_pagetables to per zone counter, zoned vm counters: conversion of nr_pagetable " Christoph Lameter, Christoph Lameter
2006-06-21 15:45 ` [PATCH 10/14] Conversion of nr_dirty to per zone counter, zoned vm counters: conversion of nr_dirty " Christoph Lameter, Christoph Lameter
[not found] ` <20060624050424.d2160354.akpm@osdl.org>
2006-06-24 18:14 ` [PATCH 10/14] Conversion " Christoph Lameter
2006-06-24 20:53 ` Christoph Lameter
2006-06-21 15:45 ` [PATCH 11/14] Conversion of nr_writeback to per zone counter, zoned vm counters: conversion of nr_writeback " Christoph Lameter, Christoph Lameter
2006-06-21 15:45 ` [PATCH 12/14] Conversion of nr_unstable to per zone counter, zoned vm counters: conversion of nr_unstable " Christoph Lameter, Christoph Lameter
2006-06-21 15:45 ` [PATCH 13/14] Conversion of nr_bounce to per zone counter, zoned vm counters: conversion of nr_bounce " Christoph Lameter, Christoph Lameter
2006-06-21 15:45 ` [PATCH 14/14] Remove useless struct wbs, zoned vm counters: remove useless writeback structure Christoph Lameter, Christoph Lameter
2006-06-21 16:36 ` [PATCH 00/14] Zoned VM counters V5 Martin J. Bligh
2006-06-21 17:06 ` Christoph Lameter
2006-06-21 17:10 ` Martin Bligh
2006-06-21 17:16 ` Christoph Lameter [this message]
2006-06-21 17:21 ` Martin Bligh
2006-06-21 17:29 ` Christoph Lameter
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