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>
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 565b7a2..b18bc0f 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 @@
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;