Patchwork [PATCHv3,1/1] powerpc: Update page in counter for CMM

login
register
mail settings
Submitter Brian King
Date Oct. 22, 2008, 3:53 p.m.
Message ID <48FF4C89.60704@linux.vnet.ibm.com>
Download mbox | patch
Permalink /patch/5350/
State Awaiting Upstream, archived
Delegated to: Paul Mackerras
Headers show

Comments

Brian King - Oct. 22, 2008, 3:53 p.m.
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>
---

 arch/powerpc/include/asm/lppaca.h |    3 ++-
 arch/powerpc/kernel/paca.c        |    1 +
 arch/powerpc/mm/fault.c           |   12 ++++++++++--
 3 files changed, 13 insertions(+), 3 deletions(-)

Patch

diff -puN arch/powerpc/mm/fault.c~powerpc_vrm_mm_pressure arch/powerpc/mm/fault.c
--- linux-2.6/arch/powerpc/mm/fault.c~powerpc_vrm_mm_pressure	2008-10-20 17:13:25.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/mm/fault.c	2008-10-22 08:53:13.000000000 -0500
@@ -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;
diff -puN arch/powerpc/include/asm/lppaca.h~powerpc_vrm_mm_pressure arch/powerpc/include/asm/lppaca.h
--- linux-2.6/arch/powerpc/include/asm/lppaca.h~powerpc_vrm_mm_pressure	2008-10-20 17:13:25.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/include/asm/lppaca.h	2008-10-21 13:46:45.000000000 -0500
@@ -133,7 +133,8 @@  struct lppaca {
 //=============================================================================
 // CACHE_LINE_4-5 0x0180 - 0x027F Contains PMC interrupt data
 //=============================================================================
-	u8	pmc_save_area[256];	// PMC interrupt Area           x00-xFF
+	u32	page_ins;			// CMO Hint - # page ins by OS  x00-x04
+	u8	pmc_save_area[252];	// PMC interrupt Area           x04-xFF
 } __attribute__((__aligned__(0x400)));
 
 extern struct lppaca lppaca[];
diff -puN arch/powerpc/kernel/paca.c~powerpc_vrm_mm_pressure arch/powerpc/kernel/paca.c
--- linux-2.6/arch/powerpc/kernel/paca.c~powerpc_vrm_mm_pressure	2008-10-20 17:13:25.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/kernel/paca.c	2008-10-20 17:13:25.000000000 -0500
@@ -37,6 +37,7 @@  struct lppaca lppaca[] = {
 		.end_of_quantum = 0xfffffffffffffffful,
 		.slb_count = 64,
 		.vmxregs_in_use = 0,
+		.page_ins = 0,
 	},
 };