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perf cpumap: Add cpu__max_present_cpu()
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>
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2 changed files with 23 additions and 0 deletions
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@ -9,6 +9,7 @@
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#include "asm/bug.h"
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static int max_cpu_num;
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static int max_present_cpu_num;
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static int max_node_num;
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static int *cpunode_map;
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@ -442,6 +443,7 @@ static void set_max_cpu_num(void)
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/* set up default */
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max_cpu_num = 4096;
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max_present_cpu_num = 4096;
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mnt = sysfs__mountpoint();
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if (!mnt)
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@ -455,6 +457,17 @@ static void set_max_cpu_num(void)
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}
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ret = get_max_num(path, &max_cpu_num);
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if (ret)
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goto out;
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/* get the highest present cpu number for a sparse allocation */
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ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
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if (ret == PATH_MAX) {
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pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
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goto out;
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}
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ret = get_max_num(path, &max_present_cpu_num);
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out:
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if (ret)
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@ -505,6 +518,15 @@ int cpu__max_cpu(void)
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return max_cpu_num;
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}
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int cpu__max_present_cpu(void)
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{
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if (unlikely(!max_present_cpu_num))
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set_max_cpu_num();
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return max_present_cpu_num;
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}
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int cpu__get_node(int cpu)
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{
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if (unlikely(cpunode_map == NULL)) {
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@ -62,6 +62,7 @@ int cpu__setup_cpunode_map(void);
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int cpu__max_node(void);
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int cpu__max_cpu(void);
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int cpu__max_present_cpu(void);
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int cpu__get_node(int cpu);
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int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
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