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perf cpumap: Add cpu__max_present_cpu()

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Similar to cpu__max_cpu() (which returns the max possible CPU), returns
the max present CPU.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/8ea4601b5cacc49927235b4ebac424bd6eeccb06.1487146877.git.jstancek@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jan Stancek 2017-02-17 12:10:24 +01:00 committed by Arnaldo Carvalho de Melo
parent 8074bf51fe
commit 92a7e12780
2 changed files with 23 additions and 0 deletions
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22
tools/perf/util/cpumap.c
View file

@ -9,6 +9,7 @@
#include "asm/bug.h"
static int max_cpu_num;
static int max_present_cpu_num;
static int max_node_num;
static int *cpunode_map;
@ -442,6 +443,7 @@ static void set_max_cpu_num(void)
/* set up default */
max_cpu_num = 4096;
max_present_cpu_num = 4096;
mnt = sysfs__mountpoint();
if (!mnt)
@ -455,6 +457,17 @@ static void set_max_cpu_num(void)
}
ret = get_max_num(path, &max_cpu_num);
if (ret)
goto out;
/* get the highest present cpu number for a sparse allocation */
ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
if (ret == PATH_MAX) {
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
goto out;
}
ret = get_max_num(path, &max_present_cpu_num);
out:
if (ret)
@ -505,6 +518,15 @@ int cpu__max_cpu(void)
return max_cpu_num;
}
int cpu__max_present_cpu(void)
{
if (unlikely(!max_present_cpu_num))
set_max_cpu_num();
return max_present_cpu_num;
}
int cpu__get_node(int cpu)
{
if (unlikely(cpunode_map == NULL)) {

1
tools/perf/util/cpumap.h
View file

@ -62,6 +62,7 @@ int cpu__setup_cpunode_map(void);
int cpu__max_node(void);
int cpu__max_cpu(void);
int cpu__max_present_cpu(void);
int cpu__get_node(int cpu);
int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,