linux-kernel - Re: [RFC/PATCHSET 0/6] perf kmem: Implement page allocation analysis (v1)

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Message-ID: <20150312155422.GA9779@gmail.com>
Date:	Thu, 12 Mar 2015 16:54:22 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <js1304@...il.com>
Subject: Re: [RFC/PATCHSET 0/6] perf kmem: Implement page allocation analysis
 (v1)


* Namhyung Kim <namhyung@...nel.org> wrote:

> > I.e. something like this (mockup) output:
> > 
> >    SUMMARY (page allocator)
> >    ========================
> > 
> >    Pages allocated+freed:       12,593   [     51,630,080 bytes ]
> > 
> >    Pages allocated-only:         2,342   [      1,235,010 bytes ]
> >    Pages freed-only:                67   [        135,311 bytes ]
> > 
> >    Page allocation failures :        0
> 
> Looks a lot better!
> 
> One thing I need to tell you is that the numbers are not pages but 
> requests.

Yes, but in the MM code we tend to call larger order allocations 
'pages' as well: higher order pages, such as a 2MB hugepage, or a 8K 
order-1 page. So at least in MM-speak it should be OK to call them 
'pages'.

But your call!

Thanks,

	Ingo
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