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

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Date:	Sun, 6 Apr 2014 14:15:46 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Don Zickus <dzickus@...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 Thu, Apr 03, 2014 at 02:48:51PM +0900, Namhyung Kim wrote:
> Hi Don,

SNIP

> 
> 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

jirka
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