linux-kernel - Re: [PATCH 6/7] perf: Add support to dynamically get cacheline size

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Message-ID: <20140523171801.GO50500@redhat.com>
Date:	Fri, 23 May 2014 13:18:01 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...stprotocols.net, peterz@...radead.org,
	LKML <linux-kernel@...r.kernel.org>, namhyung@...il.com,
	eranian@...gle.com, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 6/7] perf: Add support to dynamically get cacheline size

On Fri, May 23, 2014 at 06:54:06PM +0200, Jiri Olsa wrote:
> On Mon, May 19, 2014 at 03:13:52PM -0400, Don Zickus wrote:
> > Different arches may have different cacheline sizes.  Look it up and set
> > a global variable for reference.
> > 
> > Signed-off-by: Don Zickus <dzickus@...hat.com>
> > ---
> >  tools/perf/util/cpumap.c | 31 +++++++++++++++++++++++++++++++
> >  tools/perf/util/cpumap.h | 12 ++++++++++++
> >  tools/perf/util/sort.c   |  3 +++
> >  3 files changed, 46 insertions(+)
> > 
> > diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
> > index c4e55b7..d833238 100644
> > --- a/tools/perf/util/cpumap.c
> > +++ b/tools/perf/util/cpumap.c
> > @@ -477,3 +477,34 @@ int cpu__setup_cpunode_map(void)
> >  	closedir(dir1);
> >  	return 0;
> >  }
> > +
> > +int cpu__setup_cacheline_size(void)
> > +{
> > +	const char *mnt;
> > +	char path[PATH_MAX];
> > +	int n, ret, size;
> > +	FILE *fp;
> > +	
> > +
> > +	mnt = sysfs__mountpoint();
> > +	if (!mnt)
> > +		return -1;
> > +
> > +	n = snprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu0/cache/index0/coherency_line_size", mnt);
> > +	if (n == PATH_MAX) {
> > +		pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
> > +		return -1;
> > +	}
> > +
> > +	fp = fopen(path, "r");
> > +	if (!fp)
> > +		return -1;
> > +	ret = fscanf(fp, "%d", &size);
> > +	fclose(fp);
> > +	if (ret != 1)
> > +		return -1;
> 
> you can use filename__read_int

Doh.  I forgot about that.  I can respin this patch or the whole series
for that.  Perhaps on Tuesday when we come back from our US Holiday.

Cheers,
Don
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