linux-kernel - Re: [RFC] mm,tracing: improve current situation

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Message-ID: <1396568057.4661.38.camel@buesod1.americas.hpqcorp.net>
Date:	Thu, 03 Apr 2014 16:34:17 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Dave Jones <davej@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] mm,tracing: improve current situation

On Thu, 2014-04-03 at 15:31 -0700, Dave Hansen wrote:
> On 04/03/2014 02:44 PM, Davidlohr Bueso wrote:
> > Now, on a more general scenario, I basically would like to know, 1) is
> > this actually useful... I'm hoping that, if in fact something like this
> > gets merged, it won't just sit there. 2) What other general data would
> > be useful for debugging purposes? I'm happy to collect feedback and send
> > out something we can all benefit from.
> 
> One thing that would be nice, specifically for the VM, would be to turn
> all of the things that touch the /proc/vmstat counters
> (count_vm_event(), etc...) in to tracepoints.

Hmm what would be the difference? what's the issue with /proc/vmstat? I
guess for one, some of the stats depend on build rules (ie TLB flushing
statistics).

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