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authorBrian King <brking@linux.vnet.ibm.com>2008-10-22 05:53:45 +0000
committerPaul Mackerras <paulus@samba.org>2008-11-05 22:08:28 +1100
commit409001948d9f221c94a61c3ee96de112755fc04d (patch)
tree2f49e6f0df22721f16e2a68baf94573a923bdda4
parent1ef8014debb6410ed1960c4477d0006df11157c1 (diff)
powerpc: Update page-in counter for CMM
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>
-rw-r--r--arch/powerpc/include/asm/lppaca.h3
-rw-r--r--arch/powerpc/kernel/paca.c1
-rw-r--r--arch/powerpc/mm/fault.c12
3 files changed, 13 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h
index 2fe268b1033..25aaa97facd 100644
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -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 --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 48a347133f4..c744b327bca 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -37,6 +37,7 @@ struct lppaca lppaca[] = {
.end_of_quantum = 0xfffffffffffffffful,
.slb_count = 64,
.vmxregs_in_use = 0,
+ .page_ins = 0,
},
};
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 565b7a237c8..b18bc0f023c 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -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;