linux-kernel - Re: [PATCH 1/4] perf: Allow ability to map cpus to nodes easily

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Message-ID: <20140407182034.GF5328@redhat.com>
Date:	Mon, 7 Apr 2014 14:20:34 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>, jmario@...hat.com,
	fowles@...each.com, bp@...en8.de
Subject: Re: [PATCH 1/4] perf: Allow ability to map cpus to nodes easily

On Mon, Apr 07, 2014 at 02:28:35PM +0900, Namhyung Kim wrote:
> On Sun, 6 Apr 2014 14:15:46 +0200, Jiri Olsa wrote:
> > On Thu, Apr 03, 2014 at 02:48:51PM +0900, Namhyung Kim wrote:
> >> More generally, this sysfs access needs to check actual mountpoint using
> >> sysfs__mountpoint() IMHO.
> >> 
> >> Also this API can be generalized like reading int value from a sysfs
> >> file as the filename itself represents the content in most cases.
> >> 
> >> So how about changing this way?  It might reside on somewhere in tools/lib/api/fs/.
> >> 
> >>   max_cpu_num = sysfs__read_int("devices/system/cpu/possible");
> >> 
> >>   max_node_num = sysfs__read_int("devices/system/node/possible");
> >> 
> >> 
> >> Hmm.. looking at the code, perf already has filename__read_{int,str} API
> >> in util/util.c.  Maybe you can just use it instead.
> >
> > I think those just read the file, while Don needs to parse
> > the map to get max cpu number
> 
> Ah, missed that... sorry for noise.

Well, I already implemented using filename__read_str.  It is just added
overhead, but the end result is the same, a string needs to be read from
the file.  I just had to remember to free the memory at the end of the
function.

Cheers,
Don
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