linux-kernel - Re: [PATCH 6/6] x86: mm: set TLB flush tunable to sane value (33)

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Date:	Tue, 22 Apr 2014 17:33:53 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Dave Hansen <dave@...1.net>, x86@...nel.org
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	mgorman@...e.de, ak@...ux.intel.com, alex.shi@...aro.org,
	dave.hansen@...ux.intel.com
Subject: Re: [PATCH 6/6] x86: mm: set TLB flush tunable to sane value (33)

On 04/21/2014 02:24 PM, Dave Hansen wrote:
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> This has been run through Intel's LKP tests across a wide range
> of modern sytems and workloads and it wasn't shown to make a
> measurable performance difference positive or negative.
> 
> Now that we have some shiny new tracepoints, we can actually
> figure out what the heck is going on.
> 
> During a kernel compile, 60% of the flush_tlb_mm_range() calls
> are for a single page.  It breaks down like this:

> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>

Acked-by: Rik van Riel <riel@...hat.com>

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