Patchwork powerpc: Correct page-in counter for CMM

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Submitter Robert Jennings
Date Nov. 14, 2008, 10:07 p.m.
Message ID <20081114220734.GA26013@austin.ibm.com>
Download mbox | patch
Permalink /patch/8829/
State Accepted
Commit a6326e98a28d8a57f693369c82559543c6950f09
Delegated to: Paul Mackerras
Headers show

Comments

Robert Jennings - Nov. 14, 2008, 10:07 p.m.
Linux will report the number of page-ins so that the hypervisor can
better determine partition memory pressure.  The hardware page size and
the OS page size can be different.  In the case where the hardware page
size is 4k and the OS is running with 64k pages the prior patch would
under-report the number of pages. This patch uses PAGE_FACTOR to correct
the reporting to the hypervisor.

Reported-by: Andrew Theurer <habanero@linux.vnet.ibm.com>
Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>

---
 arch/powerpc/mm/fault.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

Index: b/arch/powerpc/mm/fault.c
===================================================================
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -324,7 +324,7 @@  good_area:
 #ifdef CONFIG_PPC_SMLPAR
 		if (firmware_has_feature(FW_FEATURE_CMO)) {
 			preempt_disable();
-			get_lppaca()->page_ins++;
+			get_lppaca()->page_ins += (1 << PAGE_FACTOR);
 			preempt_enable();
 		}
 #endif