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powerpc: Update page-in counter for CMM

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A new field has been added to the VPA as a method for the client OS to
communicate to firmware the number of page-ins it is performing when
running collaborative memory overcommit.  The hypervisor will use this
information to better determine if a partition is experiencing memory
pressure and needs more memory allocated to it.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Brian King
2008-10-22 05:53:45 +00:00
committed by Paul Mackerras
parent 1ef8014deb
commit 409001948d
3 changed files with 13 additions and 3 deletions
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12
arch/powerpc/mm/fault.c
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@@ -30,6 +30,7 @@
#include <linux/kprobes.h>
#include <linux/kdebug.h>
#include <asm/firmware.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
@@ -318,9 +319,16 @@ good_area:
goto do_sigbus;
BUG();
}
if (ret & VM_FAULT_MAJOR)
if (ret & VM_FAULT_MAJOR) {
current->maj_flt++;
else
#ifdef CONFIG_PPC_SMLPAR
if (firmware_has_feature(FW_FEATURE_CMO)) {
preempt_disable();
get_lppaca()->page_ins++;
preempt_enable();
}
#endif
} else
current->min_flt++;
up_read(&mm->mmap_sem);
return 0;