The patch titled
Avoid unnecessary PURR reading
has been added to the -mm tree. Its filename is
powerpc-add-scaled-time-accounting-speedup.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Avoid unnecessary PURR reading
From: Badari Pulavarty <pbadari@xxxxxxxxxx>
Avoid reading PURR multiple times, by passing it in to read_spurr().
Signed-off-by: Badari Pulavarty <pbadari@xxxxxxxxxx>
Cc: Michael Neuling <mikey@xxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Jay Lan <jlan@xxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN arch/powerpc/kernel/time.c~powerpc-add-scaled-time-accounting-speedup arch/powerpc/kernel/time.c
--- a/arch/powerpc/kernel/time.c~powerpc-add-scaled-time-accounting-speedup
+++ a/arch/powerpc/kernel/time.c
@@ -169,11 +169,11 @@ static u64 read_purr(void)
/*
* Read the SPURR on systems that have it, otherwise the purr
*/
-static u64 read_spurr(void)
+static u64 read_spurr(u64 purr)
{
if (cpu_has_feature(CPU_FTR_SPURR))
return mfspr(SPRN_SPURR);
- return read_purr();
+ return purr;
}
/*
@@ -189,7 +189,7 @@ void account_system_vtime(struct task_st
now = read_purr();
delta = now - get_paca()->startpurr;
get_paca()->startpurr = now;
- nowscaled = read_spurr();
+ nowscaled = read_spurr(now);
deltascaled = nowscaled - get_paca()->startspurr;
get_paca()->startspurr = nowscaled;
if (!in_interrupt()) {
_
Patches currently in -mm which might be from pbadari@xxxxxxxxxx are
x86_64-mm-vdso-text-offset.patch
ppc64-sparsemem_vmemmap-support-vmemmap-ppc64-convert-vmm_-macros-to-a-real-function-fix.patch
ext3-convert-to-new-aops.patch
ext4-convert-to-new-aops.patch
memory-unplug-v7-memory-hotplug-cleanup-fix.patch
hugetlbfs-read-support.patch
hugetlbfs-read-support-fix.patch
ext2-statfs-improvement-for-block-and-inode-free-count.patch
aio-account-i-o-wait-time-properly.patch
fix-for-ext2-reservation.patch
sysctl-remove-the-binary-interface-for-aio-nr-aio-max-nr-acpi_video_flags.patch
mem-controller-gfp-mask-fix.patch
powerpc-add-scaled-time-accounting-speedup.patch
-
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