[PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc

From: Madhavan Srinivasan
Date: Thu May 08 2014 - 05:28:37 EST


Kirill A. Shutemov with 8c6e50b029 commit introduced
vm_ops->map_pages() for mapping easy accessible pages around
fault address in hope to reduce number of minor page faults.

This patch creates infrastructure to modify the FAULT_AROUND_ORDER
value using mm/Kconfig. This will enable architecture maintainers
to decide on suitable FAULT_AROUND_ORDER value based on
performance data for that architecture. First patch also defaults
FAULT_AROUND_ORDER Kconfig element to 4. Second patch list
out the performance numbers for powerpc (platform pseries) and
initialize the fault around order variable for pseries platform of
powerpc.

V4 Changes:
Replaced the BUILD_BUG_ON with VM_BUG_ON.
Moved fault_around_pages() and fault_around_mask() functions outside of
#ifdef CONFIG_DEBUG_FS.

V3 Changes:
Replaced FAULT_AROUND_ORDER macro to a variable to support arch's that
supports sub platforms.
Made changes in commit messages.

V2 Changes:
Created Kconfig parameter for FAULT_AROUND_ORDER
Added check in do_read_fault to handle FAULT_AROUND_ORDER value of 0
Made changes in commit messages.

Madhavan Srinivasan (2):
mm: move FAULT_AROUND_ORDER to arch/
powerpc/pseries: init fault_around_order for pseries

arch/powerpc/platforms/pseries/pseries.h | 2 ++
arch/powerpc/platforms/pseries/setup.c | 5 +++++
mm/Kconfig | 8 ++++++++
mm/memory.c | 25 ++++++-------------------
4 files changed, 21 insertions(+), 19 deletions(-)

--
1.7.10.4

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