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authorAndi Kleen <andi@firstfloor.org>2008-02-23 15:24:02 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-23 17:12:16 -0800
commit0835ab53eab5bbeebe1c135e92fb0c4d483dde17 (patch)
tree037ce3a4885d46cfba34a4265bead1d081d2814b /kernel
parent00d6296145c6b671a9886e380efc24f2731d856a (diff)
downloadblackbird-op-linux-0835ab53eab5bbeebe1c135e92fb0c4d483dde17.tar.gz
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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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