linux-kernel - Re: [PATCH, v2] mm, numa: Turn 4K pte NUMA faults into effective hugepage ones

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Message-ID: <20121121093431.GA25519@gmail.com>
Date:	Wed, 21 Nov 2012 10:34:31 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH, v2] mm, numa: Turn 4K pte NUMA faults into effective
 hugepage ones


* David Rientjes <rientjes@...gle.com> wrote:

> Ok, this is significantly better, it almost cut the regression 
> in half on my system. [...]

The other half still seems to be related to the emulation faults 
that I fixed in the other patch:

>      0.49%  [kernel]          [k] page_fault                                               
>      0.06%  [kernel]          [k] emulate_vsyscall                                         

Plus TLB flush costs:

>      0.13%  [kernel]          [k] generic_smp_call_function_interrupt
>      0.08%  [kernel]          [k] flush_tlb_func

for which you should try the third patch I sent.

So please try all my fixes - the easiest way to do that would be 
to try the latest tip:master that has all related fixes 
integrated and send me a new perf top output - most page fault 
and TLB flush overhead should be gone from the profile.

Thanks,

	Ingo
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