linux-kernel - Re: [PATCH 6/7] x86: mm: set TLB flush tunable to sane value

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Message-ID: <1394157304.2555.21.camel@buesod1.americas.hpqcorp.net>
Date:	Thu, 06 Mar 2014 17:55:04 -0800
From:	Davidlohr Bueso <davidlohr@...com>
To:	Dave Hansen <dave@...1.net>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	ak@...ux.intel.com, kirill.shutemov@...ux.intel.com,
	mgorman@...e.de, alex.shi@...aro.org, x86@...nel.org,
	linux-mm@...ck.org, dave.hansen@...ux.intel.com
Subject: Re: [PATCH 6/7] x86: mm: set TLB flush tunable to sane value

On Wed, 2014-03-05 at 16:45 -0800, Dave Hansen wrote:
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> 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:

It would be interesting to see similar data for opposite workloads with
more random access patterns. That's normally when things start getting
fun in the tlb world.

Thanks,
Davidlohr

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