perf cpumap: Add cpu__max_present_cpu() (92a7e127) · Commits · 戴 / test

tools/perf/util/cpumap.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -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 −0

Original line number	Diff line number	Diff line
		@@ -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,