linux-kernel - Re: [RESEND][PATCH] mm: vmstats: tlb flush counters

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Message-ID: <20130722100605.GA1148@gmail.com>
Date:	Mon, 22 Jul 2013 12:06:06 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dave Hansen <dave@...1.net>
Cc:	Raghavendra KT <raghavendra.kt.linux@...il.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>
Subject: Re: [RESEND][PATCH] mm: vmstats: tlb flush counters


* Dave Hansen <dave@...1.net> wrote:

> On 07/19/2013 04:38 AM, Raghavendra KT wrote:
> > While measuring non - PLE performance, one of the bottleneck, I am seeing is
> > flush tlbs.
> > perf had helped in alaysing a bit there, but this patch would help
> > in precise calculation. It will aslo help in tuning the PLE window
> > experiments (larger PLE window
> > would affect remote flush TLBs)
> 
> Interesting.  What workload is that?  I've been having problems finding
> workloads that are too consumed with TLB flushes.

Btw., would be nice to also integrate these VM counters into perf as well, 
as an instrumentation variant/option.

It could be done in an almost zero overhead fashion using jump-labels I 
think.

[ Just in case someone is bored to death and is looking for an interesting 
  side project ;-) ]

Thanks,

	Ingo
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