linux-kernel - Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc

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Message-ID: <537479E7.90806@linux.vnet.ibm.com>
Date:	Thu, 15 May 2014 13:55:11 +0530
From:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org, x86@...nel.org
CC:	benh@...nel.crashing.org, paulus@...ba.org,
	kirill.shutemov@...ux.intel.com, rusty@...tcorp.com.au,
	akpm@...ux-foundation.org, riel@...hat.com, mgorman@...e.de,
	ak@...ux.intel.com, peterz@...radead.org, mingo@...nel.org,
	dave.hansen@...el.com
Subject: Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data
 for powerpc


Hi Ingo,

	Do you have any comments for the latest version of the patchset. If
not, kindly can you pick it up as is.


With regards
Maddy

> 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(-)
> 

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