Re: [oom]: [3/4] track wired pages on a per-zone basis

[Andrew Morton]

William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:
>
> Index: linux-2.6.7/include/linux/mmzone.h
> ===================================================================
> --- linux-2.6.7.orig/include/linux/mmzone.h	2004-06-16 05:19:36.000000000 +0000
> +++ linux-2.6.7/include/linux/mmzone.h	2004-06-23 18:58:13.000000000 +0000
> @@ -170,6 +170,7 @@
>  	ZONE_PADDING(_pad3_)
>  
>  	struct per_cpu_pageset	pageset[NR_CPUS];
> +	unsigned long		nr_wired[NR_CPUS];

These will share cachelines of course, so the percpuification won't be very
effective.  I wonder if there's some way in which the nr_wired accounting
can be batched up and then dumped into a single per-zone counter when we
have the zone->lru_lock.

How come there are all those PageWired() tests in the LRU manipulation
functions?


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