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perf tools: Allow ability to map cpus to nodes easily

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This patch figures out the max number of cpus and nodes that are on the
system and creates a map of cpu to node.  This allows us to provide a cpu
and quickly get the node associated with it.

It was mostly copied from builtin-kmem.c and tweaked slightly to use less memory
(use possible cpus instead of max).  It also calculates the max number of nodes.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1396896924-129847-2-git-send-email-dzickus@redhat.com
[ Removing out label code in init_cpunode_map ]
[ Adding check for snprintf error ]
[ Removing unneeded returns ]
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
This commit is contained in:
Don Zickus 2014-04-07 14:55:21 -04:00 • committed by Jiri Olsa
parent 7c2f8164e5
commit 7780c25bae
2 changed files with 195 additions and 0 deletions
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35
tools/perf/util/cpumap.h
View file

@ -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__setup_cpunode_map(void);
static inline int cpu__max_node(void)
{
if (unlikely(!max_node_num))
pr_debug("cpu_map not initialized\n");
return max_node_num;
}
static inline int cpu__max_cpu(void)
{
if (unlikely(!max_cpu_num))
pr_debug("cpu_map not initialized\n");
return max_cpu_num;
}
static inline int cpu__get_node(int cpu)
{
if (unlikely(cpunode_map == NULL)) {
pr_debug("cpu_map not initialized\n");
return -1;
}
return cpunode_map[cpu];
}
#endif /* __PERF_CPUMAP_H */