From: Andi Kleen <andi@firstfloor.org>
Date: Sat, 23 Feb 2008 23:24:02 +0000 (-0800)
Subject: cgroup memory controller: document huge memory/cache overhead in Kconfig
X-Git-Tag: v2.6.25-rc3~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0835ab53eab5bbeebe1c135e92fb0c4d483dde17;p=pandora-kernel.git

cgroup memory controller: document huge memory/cache overhead in Kconfig

Document huge memory/cache overhead of memory controller in Kconfig

I was a little surprised that 2.6.25-rc* increased struct page for the
memory controller.  At least on many x86-64 machines it will not fit into a
single cache line now anymore and also costs considerable amounts of RAM.
At earlier review I remembered asking for a external data structure for
this.

It's also quite unobvious that a innocent looking Kconfig option with a
single line Kconfig description has such a negative effect.

This patch attempts to document these disadvantages at least so that users
configuring their kernel can make a informed decision.

Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Balbir Singh <balbir@in.ibm.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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