tree 35dbc71edaa0d242ba4c0ca429c41cff67df38d0
parent 139bdb2d9e410d448281057a37b53770324ccac8
author Avi Kivity <avi@qumranet.com> 1168043810 -0800
committer Linus Torvalds <torvalds@woody.osdl.org> 1168070126 -0800

[PATCH] KVM: MMU: Page table write flood protection

In fork() (or when we protect a page that is no longer a page table), we can
experience floods of writes to a page, which have to be emulated.  This is
expensive.

So, if we detect such a flood, zap the page so subsequent writes can proceed
natively.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>