linux-kernel - Re: [RFC/PATCH 02/38] perf tools: Save mmap

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Date:	Mon, 12 Oct 2015 14:42:42 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [RFC/PATCH 02/38] perf tools: Save mmap_param.len instead of mask

On Fri, Oct 09, 2015 at 03:03:33PM +0900, Namhyung Kim wrote:
> Hi Jiri,
> 
> On Thu, Oct 08, 2015 at 12:17:11PM +0200, Jiri Olsa wrote:
> > On Fri, Oct 02, 2015 at 02:18:43PM +0900, Namhyung Kim wrote:
> > > It is more convenient saving mmap length rather than (bit) mask.  With
> > > this patch, we can eliminate dependency to perf_evlist other than
> > > getting mmap_desc for dealing with mmaps.  The mask and length can be
> > > converted using perf_evlist__mmap_mask/len().
> > > 
> > > Cc: Jiri Olsa <jolsa@...hat.com>
> > > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > 
> > after this patch I'm hitting:
> > 
> > [jolsa@...va perf]$ ./perf record  kill
> > kill: not enough arguments
> > perf: util/evlist.c:1003: perf_evlist__mmap_len: Assertion `!((mask & page_size) != 0)' failed.
> > Aborted (core dumped)
> > [jolsa@...va perf]$ 
> 
> This is strange..  I think I fixed it already.  And the expression in
> the assertion is different than the code in the patch:
> 
>   static size_t perf_evlist__mmap_len(size_t mask)
>   {
>          BUG_ON(((mask + 1) % page_size) != 0);
>   
>          return mask + 1 + page_size;
>   }
> 
> Could you please double check?

yep, that one still works.. I probably forked some older version
of your perf/threaded-v5.. the current one has it fixed already

will check the new one

thanks,
jirka
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