perf tools: Add the ability to specify list of cpus to monitor

This patch adds a -C option to stat, record, top to designate a list of CPUs to monitor. CPUs can be specified as a comma-separated list or ranges, no space allowed. Examples: $ perf record -a -C0-1,4-7 sleep 1 $ perf top -C0-4 $ perf stat -a -C1,2,3,4 sleep 1 With perf record in per-thread mode with inherit mode on, samples are collected only when the thread runs on the designated CPUs. The -C option does not turn on system-wide mode automatically. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4bff9496.d345d80a.41fe.7b00@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

perf tools: Add the ability to specify list of cpus to monitor
This patch adds a -C option to stat, record, top to designate a list of CPUs to monitor. CPUs can be specified as a comma-separated list or ranges, no space allowed. Examples: $ perf record -a -C0-1,4-7 sleep 1 $ perf top -C0-4 $ perf stat -a -C1,2,3,4 sleep 1 With perf record in per-thread mode with inherit mode on, samples are collected only when the thread runs on the designated CPUs. The -C option does not turn on system-wide mode automatically. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4bff9496.d345d80a.41fe.7b00@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Stephane Eranian · Arnaldo Carvalho de Melo
1 parent 761844b9c6
Showing 8 changed files with 110 additions and 24 deletions Side-by-side Diff
tools/perf/Documentation/perf-record.txt
tools/perf/Documentation/perf-stat.txt
tools/perf/Documentation/perf-top.txt
tools/perf/builtin-record.c
tools/perf/builtin-stat.c
tools/perf/builtin-top.c
tools/perf/util/cpumap.c
tools/perf/util/cpumap.h
@@ -103,6 +103,13 @@
 --raw-samples::
 Collect raw sample records from all opened counters (default for tracepoint counters).
  
+-C::
+--cpu::
+Collect samples only on the list of cpus provided. Multiple CPUs can be provided as a
+comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
+In per-thread mode with inheritance mode on (default), samples are captured only when
+the thread executes on the designated CPUs. Default is to monitor all CPUs.
+
 SEE ALSO
 --------
 linkperf:perf-stat[1], linkperf:perf-list[1]
@@ -46,6 +46,13 @@
 -B::
         print large numbers with thousands' separators according to locale
  
+-C::
+--cpu=::
+Count only on the list of cpus provided. Multiple CPUs can be provided as a
+comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
+In per-thread mode, this option is ignored. The -a option is still necessary
+to activate system-wide monitoring. Default is to count on all CPUs.
+
 EXAMPLES
 --------
  
@@ -25,9 +25,11 @@
 --count=<count>::
 	Event period to sample.
  
--C <cpu>::
---CPU=<cpu>::
-	CPU to profile.
+-C <cpu-list>::
+--cpu=<cpu>::
+Monitor only on the list of cpus provided. Multiple CPUs can be provided as a
+comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
+Default is to monitor all CPUS.
  
 -d <seconds>::
 --delay=<seconds>::
@@ -49,7 +49,6 @@
 static int			realtime_prio			=      0;
 static bool			raw_samples			=  false;
 static bool			system_wide			=  false;
-static int			profile_cpu			=     -1;
 static pid_t			target_pid			=     -1;
 static pid_t			target_tid			=     -1;
 static pid_t			*all_tids			=      NULL;
@@ -74,6 +73,7 @@
 static off_t			post_processing_offset;
  
 static struct perf_session	*session;
+static const char		*cpu_list;
  
 struct mmap_data {
 	int			counter;
@@ -300,7 +300,7 @@
 				die("Permission error - are you root?\n"
 					"\t Consider tweaking"
 					" /proc/sys/kernel/perf_event_paranoid.\n");
-			else if (err ==  ENODEV && profile_cpu != -1) {
+			else if (err ==  ENODEV && cpu_list) {
 				die("No such device - did you specify"
 					" an out-of-range profile CPU?\n");
 			}
  
@@ -622,10 +622,15 @@
 		close(child_ready_pipe[0]);
 	}
  
-	if ((!system_wide && no_inherit) || profile_cpu != -1) {
-		open_counters(profile_cpu);
+	nr_cpus = read_cpu_map(cpu_list);
+	if (nr_cpus < 1) {
+		perror("failed to collect number of CPUs\n");
+		return -1;
+	}
+
+	if (!system_wide && no_inherit && !cpu_list) {
+		open_counters(-1);
 	} else {
-		nr_cpus = read_cpu_map();
 		for (i = 0; i < nr_cpus; i++)
 			open_counters(cpumap[i]);
 	}
@@ -704,7 +709,7 @@
 	if (perf_guest)
 		perf_session__process_machines(session, event__synthesize_guest_os);
  
-	if (!system_wide && profile_cpu == -1)
+	if (!system_wide && cpu_list)
 		event__synthesize_thread(target_tid, process_synthesized_event,
 					 session);
 	else
@@ -794,8 +799,8 @@
 			    "system-wide collection from all CPUs"),
 	OPT_BOOLEAN('A', "append", &append_file,
 			    "append to the output file to do incremental profiling"),
-	OPT_INTEGER('C', "profile_cpu", &profile_cpu,
-			    "CPU to profile on"),
+	OPT_STRING('C', "cpu", &cpu_list, "cpu",
+		    "list of cpus to monitor"),
 	OPT_BOOLEAN('f', "force", &force,
 			"overwrite existing data file (deprecated)"),
 	OPT_U64('c', "count", &user_interval, "event period to sample"),
@@ -825,7 +830,7 @@
 	argc = parse_options(argc, argv, options, record_usage,
 			    PARSE_OPT_STOP_AT_NON_OPTION);
 	if (!argc && target_pid == -1 && target_tid == -1 &&
-		!system_wide && profile_cpu == -1)
+		!system_wide && !cpu_list)
 		usage_with_options(record_usage, options);
  
 	if (force && append_file) {
@@ -69,7 +69,7 @@
 };
  
 static bool			system_wide			=  false;
-static unsigned int		nr_cpus				=  0;
+static int			nr_cpus				=  0;
 static int			run_idx				=  0;
  
 static int			run_count			=  1;
@@ -82,6 +82,7 @@
 static pid_t			child_pid			= -1;
 static bool			null_run			=  false;
 static bool			big_num				=  false;
+static const char		*cpu_list;
  
  
 static int			*fd[MAX_NR_CPUS][MAX_COUNTERS];
@@ -158,7 +159,7 @@
 				    PERF_FORMAT_TOTAL_TIME_RUNNING;
  
 	if (system_wide) {
-		unsigned int cpu;
+		int cpu;
  
 		for (cpu = 0; cpu < nr_cpus; cpu++) {
 			fd[cpu][counter][0] = sys_perf_event_open(attr,
@@ -208,7 +209,7 @@
 static void read_counter(int counter)
 {
 	u64 count[3], single_count[3];
-	unsigned int cpu;
+	int cpu;
 	size_t res, nv;
 	int scaled;
 	int i, thread;
@@ -542,6 +543,8 @@
 		    "null run - dont start any counters"),
 	OPT_BOOLEAN('B', "big-num", &big_num,
 		    "print large numbers with thousands\' separators"),
+	OPT_STRING('C', "cpu", &cpu_list, "cpu",
+		    "list of cpus to monitor in system-wide"),
 	OPT_END()
 };
  
  
@@ -566,9 +569,12 @@
 	}
  
 	if (system_wide)
-		nr_cpus = read_cpu_map();
+		nr_cpus = read_cpu_map(cpu_list);
 	else
 		nr_cpus = 1;
+
+	if (nr_cpus < 1)
+		usage_with_options(stat_usage, options);
  
 	if (target_pid != -1) {
 		target_tid = target_pid;
@@ -102,6 +102,7 @@
 static int			sym_pcnt_filter			=      5;
 static int			sym_counter			=      0;
 static int			display_weighted		=     -1;
+static const char		*cpu_list;
  
 /*
  * Symbols
@@ -1351,8 +1352,8 @@
 		    "profile events on existing thread id"),
 	OPT_BOOLEAN('a', "all-cpus", &system_wide,
 			    "system-wide collection from all CPUs"),
-	OPT_INTEGER('C', "CPU", &profile_cpu,
-		    "CPU to profile on"),
+	OPT_STRING('C', "cpu", &cpu_list, "cpu",
+		    "list of cpus to monitor"),
 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 		   "file", "vmlinux pathname"),
 	OPT_BOOLEAN('K', "hide_kernel_symbols", &hide_kernel_symbols,
  
@@ -1428,10 +1429,10 @@
 		return -ENOMEM;
  
 	/* CPU and PID are mutually exclusive */
-	if (target_tid > 0 && profile_cpu != -1) {
+	if (target_tid > 0 && cpu_list) {
 		printf("WARNING: PID switch overriding CPU\n");
 		sleep(1);
-		profile_cpu = -1;
+		cpu_list = NULL;
 	}
  
 	if (!nr_counters)
  
@@ -1469,10 +1470,13 @@
 		attrs[counter].sample_period = default_interval;
 	}
  
-	if (target_tid != -1 || profile_cpu != -1)
+	if (target_tid != -1)
 		nr_cpus = 1;
 	else
-		nr_cpus = read_cpu_map();
+		nr_cpus = read_cpu_map(cpu_list);
+
+	if (nr_cpus < 1)
+		usage_with_options(top_usage, options);
  
 	get_term_dimensions(&winsize);
 	if (print_entries == 0) {
@@ -20,7 +20,7 @@
 	return nr_cpus;
 }
  
-int read_cpu_map(void)
+static int read_all_cpu_map(void)
 {
 	FILE *onlnf;
 	int nr_cpus = 0;
@@ -56,5 +56,60 @@
 		return nr_cpus;
  
 	return default_cpu_map();
+}
+
+int read_cpu_map(const char *cpu_list)
+{
+	unsigned long start_cpu, end_cpu = 0;
+	char *p = NULL;
+	int i, nr_cpus = 0;
+
+	if (!cpu_list)
+		return read_all_cpu_map();
+
+	if (!isdigit(*cpu_list))
+		goto invalid;
+
+	while (isdigit(*cpu_list)) {
+		p = NULL;
+		start_cpu = strtoul(cpu_list, &p, 0);
+		if (start_cpu >= INT_MAX
+		    || (*p != '\0' && *p != ',' && *p != '-'))
+			goto invalid;
+
+		if (*p == '-') {
+			cpu_list = ++p;
+			p = NULL;
+			end_cpu = strtoul(cpu_list, &p, 0);
+
+			if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
+				goto invalid;
+
+			if (end_cpu < start_cpu)
+				goto invalid;
+		} else {
+			end_cpu = start_cpu;
+		}
+
+		for (; start_cpu <= end_cpu; start_cpu++) {
+			/* check for duplicates */
+			for (i = 0; i < nr_cpus; i++)
+				if (cpumap[i] == (int)start_cpu)
+					goto invalid;
+
+			assert(nr_cpus < MAX_NR_CPUS);
+			cpumap[nr_cpus++] = (int)start_cpu;
+		}
+		if (*p)
+			++p;
+
+		cpu_list = p;
+	}
+	if (nr_cpus > 0)
+		return nr_cpus;
+
+	return default_cpu_map();
+invalid:
+	return -1;
 }
 #ifndef __PERF_CPUMAP_H
 #define __PERF_CPUMAP_H
  
-extern int read_cpu_map(void);
+extern int read_cpu_map(const char *cpu_list);
 extern int cpumap[];
  
 #endif /* __PERF_CPUMAP_H */
...	...	@@ -103,6 +103,13 @@
103	103	--raw-samples::
104	104	Collect raw sample records from all opened counters (default for tracepoint counters).
105	105
	106	+-C::
	107	+--cpu::
	108	+Collect samples only on the list of cpus provided. Multiple CPUs can be provided as a
	109	+comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
	110	+In per-thread mode with inheritance mode on (default), samples are captured only when
	111	+the thread executes on the designated CPUs. Default is to monitor all CPUs.
	112	+
106	113	SEE ALSO
107	114	--------
108	115	linkperf:perf-stat[1], linkperf:perf-list[1]
...	...	@@ -46,6 +46,13 @@
46	46	-B::
47	47	print large numbers with thousands' separators according to locale
48	48
	49	+-C::
	50	+--cpu=::
	51	+Count only on the list of cpus provided. Multiple CPUs can be provided as a
	52	+comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
	53	+In per-thread mode, this option is ignored. The -a option is still necessary
	54	+to activate system-wide monitoring. Default is to count on all CPUs.
	55	+
49	56	EXAMPLES
50	57	--------
51	58
...	...	@@ -25,9 +25,11 @@
25	25	--count=<count>::
26	26	Event period to sample.
27	27
28		--C <cpu>::
29		---CPU=<cpu>::
30		- CPU to profile.
	28	+-C <cpu-list>::
	29	+--cpu=<cpu>::
	30	+Monitor only on the list of cpus provided. Multiple CPUs can be provided as a
	31	+comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
	32	+Default is to monitor all CPUS.
31	33
32	34	-d <seconds>::
33	35	--delay=<seconds>::
...	...	@@ -49,7 +49,6 @@
49	49	static int realtime_prio = 0;
50	50	static bool raw_samples = false;
51	51	static bool system_wide = false;
52		-static int profile_cpu = -1;
53	52	static pid_t target_pid = -1;
54	53	static pid_t target_tid = -1;
55	54	static pid_t *all_tids = NULL;
...	...	@@ -74,6 +73,7 @@
74	73	static off_t post_processing_offset;
75	74
76	75	static struct perf_session *session;
	76	+static const char *cpu_list;
77	77
78	78	struct mmap_data {
79	79	int counter;
...	...	@@ -300,7 +300,7 @@
300	300	die("Permission error - are you root?\n"
301	301	"\t Consider tweaking"
302	302	" /proc/sys/kernel/perf_event_paranoid.\n");
303		- else if (err == ENODEV && profile_cpu != -1) {
	303	+ else if (err == ENODEV && cpu_list) {
304	304	die("No such device - did you specify"
305	305	" an out-of-range profile CPU?\n");
306	306	}
307	307
...	...	@@ -622,10 +622,15 @@
622	622	close(child_ready_pipe[0]);
623	623	}
624	624
625		- if ((!system_wide && no_inherit) \|\| profile_cpu != -1) {
626		- open_counters(profile_cpu);
	625	+ nr_cpus = read_cpu_map(cpu_list);
	626	+ if (nr_cpus < 1) {
	627	+ perror("failed to collect number of CPUs\n");
	628	+ return -1;
	629	+ }
	630	+
	631	+ if (!system_wide && no_inherit && !cpu_list) {
	632	+ open_counters(-1);
627	633	} else {
628		- nr_cpus = read_cpu_map();
629	634	for (i = 0; i < nr_cpus; i++)
630	635	open_counters(cpumap[i]);
631	636	}
...	...	@@ -704,7 +709,7 @@
704	709	if (perf_guest)
705	710	perf_session__process_machines(session, event__synthesize_guest_os);
706	711
707		- if (!system_wide && profile_cpu == -1)
	712	+ if (!system_wide && cpu_list)
708	713	event__synthesize_thread(target_tid, process_synthesized_event,
709	714	session);
710	715	else
...	...	@@ -794,8 +799,8 @@
794	799	"system-wide collection from all CPUs"),
795	800	OPT_BOOLEAN('A', "append", &append_file,
796	801	"append to the output file to do incremental profiling"),
797		- OPT_INTEGER('C', "profile_cpu", &profile_cpu,
798		- "CPU to profile on"),
	802	+ OPT_STRING('C', "cpu", &cpu_list, "cpu",
	803	+ "list of cpus to monitor"),
799	804	OPT_BOOLEAN('f', "force", &force,
800	805	"overwrite existing data file (deprecated)"),
801	806	OPT_U64('c', "count", &user_interval, "event period to sample"),
...	...	@@ -825,7 +830,7 @@
825	830	argc = parse_options(argc, argv, options, record_usage,
826	831	PARSE_OPT_STOP_AT_NON_OPTION);
827	832	if (!argc && target_pid == -1 && target_tid == -1 &&
828		- !system_wide && profile_cpu == -1)
	833	+ !system_wide && !cpu_list)
829	834	usage_with_options(record_usage, options);
830	835
831	836	if (force && append_file) {
...	...	@@ -69,7 +69,7 @@
69	69	};
70	70
71	71	static bool system_wide = false;
72		-static unsigned int nr_cpus = 0;
	72	+static int nr_cpus = 0;
73	73	static int run_idx = 0;
74	74
75	75	static int run_count = 1;
...	...	@@ -82,6 +82,7 @@
82	82	static pid_t child_pid = -1;
83	83	static bool null_run = false;
84	84	static bool big_num = false;
	85	+static const char *cpu_list;
85	86
86	87
87	88	static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
...	...	@@ -158,7 +159,7 @@
158	159	PERF_FORMAT_TOTAL_TIME_RUNNING;
159	160
160	161	if (system_wide) {
161		- unsigned int cpu;
	162	+ int cpu;
162	163
163	164	for (cpu = 0; cpu < nr_cpus; cpu++) {
164	165	fd[cpu][counter][0] = sys_perf_event_open(attr,
...	...	@@ -208,7 +209,7 @@
208	209	static void read_counter(int counter)
209	210	{
210	211	u64 count[3], single_count[3];
211		- unsigned int cpu;
	212	+ int cpu;
212	213	size_t res, nv;
213	214	int scaled;
214	215	int i, thread;
...	...	@@ -542,6 +543,8 @@
542	543	"null run - dont start any counters"),
543	544	OPT_BOOLEAN('B', "big-num", &big_num,
544	545	"print large numbers with thousands\' separators"),
	546	+ OPT_STRING('C', "cpu", &cpu_list, "cpu",
	547	+ "list of cpus to monitor in system-wide"),
545	548	OPT_END()
546	549	};
547	550
548	551
...	...	@@ -566,9 +569,12 @@
566	569	}
567	570
568	571	if (system_wide)
569		- nr_cpus = read_cpu_map();
	572	+ nr_cpus = read_cpu_map(cpu_list);
570	573	else
571	574	nr_cpus = 1;
	575	+
	576	+ if (nr_cpus < 1)
	577	+ usage_with_options(stat_usage, options);
572	578
573	579	if (target_pid != -1) {
574	580	target_tid = target_pid;
...	...	@@ -102,6 +102,7 @@
102	102	static int sym_pcnt_filter = 5;
103	103	static int sym_counter = 0;
104	104	static int display_weighted = -1;
	105	+static const char *cpu_list;
105	106
106	107	/*
107	108	* Symbols
...	...	@@ -1351,8 +1352,8 @@
1351	1352	"profile events on existing thread id"),
1352	1353	OPT_BOOLEAN('a', "all-cpus", &system_wide,
1353	1354	"system-wide collection from all CPUs"),
1354		- OPT_INTEGER('C', "CPU", &profile_cpu,
1355		- "CPU to profile on"),
	1355	+ OPT_STRING('C', "cpu", &cpu_list, "cpu",
	1356	+ "list of cpus to monitor"),
1356	1357	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1357	1358	"file", "vmlinux pathname"),
1358	1359	OPT_BOOLEAN('K', "hide_kernel_symbols", &hide_kernel_symbols,
1359	1360
...	...	@@ -1428,10 +1429,10 @@
1428	1429	return -ENOMEM;
1429	1430
1430	1431	/* CPU and PID are mutually exclusive */
1431		- if (target_tid > 0 && profile_cpu != -1) {
	1432	+ if (target_tid > 0 && cpu_list) {
1432	1433	printf("WARNING: PID switch overriding CPU\n");
1433	1434	sleep(1);
1434		- profile_cpu = -1;
	1435	+ cpu_list = NULL;
1435	1436	}
1436	1437
1437	1438	if (!nr_counters)
1438	1439
...	...	@@ -1469,10 +1470,13 @@
1469	1470	attrs[counter].sample_period = default_interval;
1470	1471	}
1471	1472
1472		- if (target_tid != -1 \|\| profile_cpu != -1)
	1473	+ if (target_tid != -1)
1473	1474	nr_cpus = 1;
1474	1475	else
1475		- nr_cpus = read_cpu_map();
	1476	+ nr_cpus = read_cpu_map(cpu_list);
	1477	+
	1478	+ if (nr_cpus < 1)
	1479	+ usage_with_options(top_usage, options);
1476	1480
1477	1481	get_term_dimensions(&winsize);
1478	1482	if (print_entries == 0) {
...	...	@@ -20,7 +20,7 @@
20	20	return nr_cpus;
21	21	}
22	22
23		-int read_cpu_map(void)
	23	+static int read_all_cpu_map(void)
24	24	{
25	25	FILE *onlnf;
26	26	int nr_cpus = 0;
...	...	@@ -56,5 +56,60 @@
56	56	return nr_cpus;
57	57
58	58	return default_cpu_map();
	59	+}
	60	+
	61	+int read_cpu_map(const char *cpu_list)
	62	+{
	63	+ unsigned long start_cpu, end_cpu = 0;
	64	+ char *p = NULL;
	65	+ int i, nr_cpus = 0;
	66	+
	67	+ if (!cpu_list)
	68	+ return read_all_cpu_map();
	69	+
	70	+ if (!isdigit(*cpu_list))
	71	+ goto invalid;
	72	+
	73	+ while (isdigit(*cpu_list)) {
	74	+ p = NULL;
	75	+ start_cpu = strtoul(cpu_list, &p, 0);
	76	+ if (start_cpu >= INT_MAX
	77	+ \|\| (p != '\0' && p != ',' && *p != '-'))
	78	+ goto invalid;
	79	+
	80	+ if (*p == '-') {
	81	+ cpu_list = ++p;
	82	+ p = NULL;
	83	+ end_cpu = strtoul(cpu_list, &p, 0);
	84	+
	85	+ if (end_cpu >= INT_MAX \|\| (p != '\0' && p != ','))
	86	+ goto invalid;
	87	+
	88	+ if (end_cpu < start_cpu)
	89	+ goto invalid;
	90	+ } else {
	91	+ end_cpu = start_cpu;
	92	+ }
	93	+
	94	+ for (; start_cpu <= end_cpu; start_cpu++) {
	95	+ /* check for duplicates */
	96	+ for (i = 0; i < nr_cpus; i++)
	97	+ if (cpumap[i] == (int)start_cpu)
	98	+ goto invalid;
	99	+
	100	+ assert(nr_cpus < MAX_NR_CPUS);
	101	+ cpumap[nr_cpus++] = (int)start_cpu;
	102	+ }
	103	+ if (*p)
	104	+ ++p;
	105	+
	106	+ cpu_list = p;
	107	+ }
	108	+ if (nr_cpus > 0)
	109	+ return nr_cpus;
	110	+
	111	+ return default_cpu_map();
	112	+invalid:
	113	+ return -1;
59	114	}
1	1	#ifndef __PERF_CPUMAP_H
2	2	#define __PERF_CPUMAP_H
3	3
4		-extern int read_cpu_map(void);
	4	+extern int read_cpu_map(const char *cpu_list);
5	5	extern int cpumap[];
6	6
7	7	#endif /* __PERF_CPUMAP_H */