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

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Date:	Mon, 16 Mar 2015 11:06:22 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Ingo Molnar <mingo@...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)

Hi Ingo,

On Fri, Mar 13, 2015 at 01:44:20PM +0100, Ingo Molnar wrote:
> 
> * Namhyung Kim <namhyung@...nel.org> wrote:
> 
> > Hi Ingo,
> > 
> > On Thu, Mar 12, 2015 at 04:54:22PM +0100, Ingo Molnar wrote:
> > > 
> > > * 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!
> > 
> > How about this?
> > 
> >   SUMMARY (page allocator)
> >   ========================
> >   Total allocation requests   :        9,015  [     37,200 Kbytes ]  (A)
> >   Total free requests         :        8,093  [     33,176 Kbytes ]  (B)
> > 
> >   Total alloc+freed requests  :        7,985  [     32,732 Kbytes ]  (C)
> >   Total alloc-only requests   :        1,030  [      4,468 Kbytes ]  (D)
> >   Total free-only requests    :          108  [        444 Kbytes ]  (E)
> > 
> >   Total allocation failure    :            0  [          0 Kbytes ]
> 
> s/failure/failures
> s/Kbytes/KB

OK

> 
> I'd leave a bit more space for the numbers, for up into billions of 
> requests and terabytes of data. Other than that, sounds good to me!

I reserved 16 character space for each!

Thanks,
Namhyung
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