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05 April 2024, 19:05:47 UTC
Revision 485761bd6a72d33b3d4fa884927b2b0d983b701e authored by Andi Kleen on 27 August 2005, 01:34:10 UTC, committed by Linus Torvalds on 27 August 2005, 02:37:12 UTC 
[PATCH] x86_64: Tell VM about holes in nodes
 
Some nodes can have large holes on x86-64.

This fixes problems with the VM allowing too many dirty pages because it
overestimates the number of available RAM in a node.  In extreme cases you
can end up with all RAM filled with dirty pages which can lead to deadlocks
and other nasty behaviour.

This patch just tells the VM about the known holes from e820.  Reserved
(like the kernel text or mem_map) is still not taken into account, but that
should be only a few percent error now.

Small detail is that the flat setup uses the NUMA free_area_init_node() now
too because it offers more flexibility.

(akpm: lotsa thanks to Martin for working this problem out)

Cc: Martin Bligh <mbligh@mbligh.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent bebf468
History
Tip revision: 485761bd6a72d33b3d4fa884927b2b0d983b701e authored by Andi Kleen on 27 August 2005, 01:34:10 UTC
[PATCH] x86_64: Tell VM about holes in nodes
Tip revision: 485761b
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