linux-kernel - Re: [PATCH 04/19] perf: Allow ability to map cpus to nodes easily

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Date:	Wed, 19 Mar 2014 09:38:15 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...stprotocols.net, LKML <linux-kernel@...r.kernel.org>,
	jmario@...hat.com, fowles@...each.com, eranian@...gle.com
Subject: Re: [PATCH 04/19] perf: Allow ability to map cpus to nodes easily

On Wed, Mar 19, 2014 at 01:48:27PM +0100, Jiri Olsa wrote:
> On Fri, Feb 28, 2014 at 12:42:53PM -0500, Don Zickus wrote:
> > This patch figures out the max number of cpus and nodes that are on the
> 
> SNIP
> 
> > +
> > +int cpu_map__setup_cpunode_map(void)
> > +{
> > +	struct dirent *dent1, *dent2;
> > +	DIR *dir1, *dir2;
> > +	unsigned int cpu, mem;
> > +	char buf[PATH_MAX];
> > +
> > +	/* initialize globals */
> > +	if (init_cpunode_map())
> > +		return -1;
> > +
> > +	dir1 = opendir(PATH_SYS_NODE);
> > +	if (!dir1)
> > +		return 0;
> > +
> > +	/* walk tree and setup map */
> > +	while ((dent1 = readdir(dir1)) != NULL) {
> > +		if (dent1->d_type != DT_DIR ||
> > +		    sscanf(dent1->d_name, "node%u", &mem) < 1)
> > +			continue;
> > +
> > +		snprintf(buf, PATH_MAX, "%s/%s", PATH_SYS_NODE, dent1->d_name);
> > +		dir2 = opendir(buf);
> > +		if (!dir2)
> > +			continue;
> > +		while ((dent2 = readdir(dir2)) != NULL) {
> > +			if (dent2->d_type != DT_LNK ||
> > +			    sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
> > +				continue;
> > +			cpunode_map[cpu] = mem;
> > +		}
> > +		closedir(dir2);
> > +	}
> > +	closedir(dir1);
> > +	return 0;
> > +}
> > +
> > diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
> > index b123bb9..d6fde2b 100644
> > --- a/tools/perf/util/cpumap.h
> > +++ b/tools/perf/util/cpumap.h
> > @@ -4,6 +4,9 @@
> >  #include <stdio.h>
> >  #include <stdbool.h>
> >  
> > +#include "perf.h"
> > +#include "util/debug.h"
> > +
> >  struct cpu_map {
> >  	int nr;
> >  	int map[];
> > @@ -46,4 +49,36 @@ static inline bool cpu_map__empty(const struct cpu_map *map)
> >  	return map ? map->map[0] == -1 : true;
> >  }
> >  
> > +int max_cpu_num;
> > +int max_node_num;
> > +int *cpunode_map;
> > +
> > +int cpu_map__setup_cpunode_map(void);
> > +
> > +static inline int cpu_map__max_node(void)
> > +{
> > +	if (unlikely(!max_node_num))
> > +		pr_debug("cpu_map not initiailzed\n");
> > +
> > +	return max_node_num;
> > +}
> > +
> > +static inline int cpu_map__max_cpu(void)
> > +{
> > +	if (unlikely(!max_cpu_num))
> > +		pr_debug("cpu_map not initiailzed\n");
> > +
> > +	return max_cpu_num;
> > +}
> > +
> > +static inline int cpu_map__get_node(int cpu)
> > +{
> > +	if (unlikely(cpunode_map == NULL)) {
> > +		pr_debug("cpu_map not initialized\n");
> > +		return -1;
> > +	}
> > +
> > +	return cpunode_map[cpu];
> > +}
> 
> cool, maybe above function names should not have 'cpu_map..',
> it's like pure cpu-ish stuff, maybe:
> 
>   setup_cpunode_map
>   cpu__max_node
>   cpu__max_cpu
>   cpu__get_node
> 
> or something like that ;-)

Sure.  That works for me. :-)

Cheers,
Don
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