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* [PATCH] [PATCH v2] perf: Modify MAX_NR_CPUS and MAX_CACHES
@ 2019-06-28 15:35 Kyle Meyer
  2019-07-17  7:30 ` Jiri Olsa
  0 siblings, 1 reply; 2+ messages in thread
From: Kyle Meyer @ 2019-06-28 15:35 UTC (permalink / raw)
  Cc: Kyle Meyer, Peter Zijlstra, Ingo Molnar,
	Arnaldo Carvalho de Melo, Alexander Shishkin, Jiri Olsa,
	Namhyung Kim, linux-kernel, Russ Anderson, Kyle Meyer

Perf surpasses the limit of MAX_NR_CPUS and MAX_CACHES while attempting to
profile 1024 or more CPUs. Increase and/or make each limit dynamic to
regain normal functionality.

Before:
	perf record -a
	[ perf record: Woken up X times to write data ]
	way too many cpu caches..
	[ perf record: Captured and wrote X MB perf.data (X samples) ]

	perf report -C 1024
	Error: failed to set  cpu bitmap
	Requested CPU 1024 too large. Consider raising MAX_NR_CPUS

After:
	perf record -a
	[ perf record: Woken up X times to write data ]
	[ perf record: Captured and wrote X MB perf.data (X samples) ]

	perf report -C 1024
	...

The variables nr_cpus_onln and max_caches are alternatives for MAX_NR_CPUS
and MAX_CACHES, they are initialized at runtime. MAX_NR_CPUS is increased
from 1024 to 2048 as it is still used by DECLARE_BITMAP() at compile time,
nr_cpus_onln replaces it elsewhere throughout perf.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: Russ Anderson <russ.anderson@hpe.com>
Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
---
 tools/perf/perf.c           |  6 ++++++
 tools/perf/perf.h           |  3 ++-
 tools/perf/util/cpumap.c    |  6 +++---
 tools/perf/util/header.c    |  7 +++----
 tools/perf/util/machine.c   | 11 +++++------
 tools/perf/util/session.c   |  5 ++---
 tools/perf/util/stat.c      |  4 ++--
 tools/perf/util/svghelper.c | 10 +++++-----
 8 files changed, 28 insertions(+), 24 deletions(-)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 72df4b6fa36f..c2c22476a65f 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -427,6 +427,12 @@ int main(int argc, const char **argv)
 	const char *cmd;
 	char sbuf[STRERR_BUFSIZE];
 
+	nr_cpus_onln = sysconf(_SC_NPROCESSORS_ONLN);
+	if (nr_cpus_onln < 0) {
+		fprintf(stderr, "Cannot determine the number of CPUs currently online.\n");
+		goto out;
+	}
+	
 	/* libsubcmd init */
 	exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
 	pager_init(PERF_PAGER_ENVIRONMENT);
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 711e009381ec..603391cac85b 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -26,9 +26,10 @@ static inline unsigned long long rdclock(void)
 }
 
 #ifndef MAX_NR_CPUS
-#define MAX_NR_CPUS			1024
+#define MAX_NR_CPUS			2048
 #endif
 
+int nr_cpus_onln;
 extern const char *input_name;
 extern bool perf_host, perf_guest;
 extern const char perf_version_string[];
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index c11a459ca582..83c05afef063 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -72,7 +72,7 @@ struct cpu_map *cpu_map__read(FILE *file)
 			int new_max = nr_cpus + cpu - prev - 1;
 
 			if (new_max >= max_entries) {
-				max_entries = new_max + MAX_NR_CPUS / 2;
+				max_entries = new_max + nr_cpus_onln / 2;
 				tmp = realloc(tmp_cpus, max_entries * sizeof(int));
 				if (tmp == NULL)
 					goto out_free_tmp;
@@ -83,7 +83,7 @@ struct cpu_map *cpu_map__read(FILE *file)
 				tmp_cpus[nr_cpus++] = prev;
 		}
 		if (nr_cpus == max_entries) {
-			max_entries += MAX_NR_CPUS;
+			max_entries += nr_cpus_onln;
 			tmp = realloc(tmp_cpus, max_entries * sizeof(int));
 			if (tmp == NULL)
 				goto out_free_tmp;
@@ -170,7 +170,7 @@ struct cpu_map *cpu_map__new(const char *cpu_list)
 					goto invalid;
 
 			if (nr_cpus == max_entries) {
-				max_entries += MAX_NR_CPUS;
+				max_entries += nr_cpus_onln;
 				tmp = realloc(tmp_cpus, max_entries * sizeof(int));
 				if (tmp == NULL)
 					goto invalid;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 06ddb6618ef3..78f1acb069ed 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1121,16 +1121,15 @@ static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
 	return 0;
 }
 
-#define MAX_CACHES 2000
-
 static int write_cache(struct feat_fd *ff,
 		       struct perf_evlist *evlist __maybe_unused)
 {
-	struct cpu_cache_level caches[MAX_CACHES];
+	u32 max_caches = (nr_cpus_onln * 4);
+	struct cpu_cache_level caches[max_caches];
 	u32 cnt = 0, i, version = 1;
 	int ret;
 
-	ret = build_caches(caches, MAX_CACHES, &cnt);
+	ret = build_caches(caches, max_caches, &cnt);
 	if (ret)
 		goto out;
 
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 17eec39e775e..b4d792dbeb1f 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2593,7 +2593,7 @@ int __machine__synthesize_threads(struct machine *machine, struct perf_tool *too
 
 pid_t machine__get_current_tid(struct machine *machine, int cpu)
 {
-	if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid)
+	if (cpu < 0 || cpu >= nr_cpus_onln || !machine->current_tid)
 		return -1;
 
 	return machine->current_tid[cpu];
@@ -2610,16 +2610,15 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
 	if (!machine->current_tid) {
 		int i;
 
-		machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t));
+		machine->current_tid = calloc(nr_cpus_onln, sizeof(pid_t));
 		if (!machine->current_tid)
 			return -ENOMEM;
-		for (i = 0; i < MAX_NR_CPUS; i++)
+		for (i = 0; i < nr_cpus_onln; i++)
 			machine->current_tid[i] = -1;
 	}
 
-	if (cpu >= MAX_NR_CPUS) {
-		pr_err("Requested CPU %d too large. ", cpu);
-		pr_err("Consider raising MAX_NR_CPUS\n");
+	if (cpu >= nr_cpus_onln) {
+		pr_err("Requested CPU %d too large, there are %d CPUs currently online.\n", cpu, nr_cpus_onln);
 		return -EINVAL;
 	}
 
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 54cf163347f7..8641364555fb 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -2289,9 +2289,8 @@ int perf_session__cpu_bitmap(struct perf_session *session,
 	for (i = 0; i < map->nr; i++) {
 		int cpu = map->map[i];
 
-		if (cpu >= MAX_NR_CPUS) {
-			pr_err("Requested CPU %d too large. "
-			       "Consider raising MAX_NR_CPUS\n", cpu);
+		if (cpu >= nr_cpus_onln) {
+			pr_err("Requested CPU %d too large, there are %d CPUs currently online.\n", cpu, nr_cpus_onln);
 			goto out_delete_map;
 		}
 
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index d91fe754b6d2..9d4a3b96496a 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -207,7 +207,7 @@ void perf_evlist__reset_stats(struct perf_evlist *evlist)
 static void zero_per_pkg(struct perf_evsel *counter)
 {
 	if (counter->per_pkg_mask)
-		memset(counter->per_pkg_mask, 0, MAX_NR_CPUS);
+		memset(counter->per_pkg_mask, 0, nr_cpus_onln);
 }
 
 static int check_per_pkg(struct perf_evsel *counter,
@@ -226,7 +226,7 @@ static int check_per_pkg(struct perf_evsel *counter,
 		return 0;
 
 	if (!mask) {
-		mask = zalloc(MAX_NR_CPUS);
+		mask = zalloc(nr_cpus_onln);
 		if (!mask)
 			return -ENOMEM;
 
diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index fab8a048d31b..6a8241932dce 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -705,7 +705,7 @@ static void scan_thread_topology(int *map, struct topology *t, int cpu, int *pos
 
 		for_each_set_bit(thr,
 				 cpumask_bits(&t->sib_thr[i]),
-				 MAX_NR_CPUS)
+				 nr_cpus_onln)
 			if (map[thr] == -1)
 				map[thr] = (*pos)++;
 	}
@@ -720,7 +720,7 @@ static void scan_core_topology(int *map, struct topology *t)
 	for (i = 0; i < t->sib_core_nr; i++)
 		for_each_set_bit(cpu,
 				 cpumask_bits(&t->sib_core[i]),
-				 MAX_NR_CPUS)
+				 nr_cpus_onln)
 			scan_thread_topology(map, t, cpu, &pos);
 }
 
@@ -737,7 +737,7 @@ static int str_to_bitmap(char *s, cpumask_t *b)
 
 	for (i = 0; i < m->nr; i++) {
 		c = m->map[i];
-		if (c >= MAX_NR_CPUS) {
+		if (c >= nr_cpus_onln) {
 			ret = -1;
 			break;
 		}
@@ -784,13 +784,13 @@ int svg_build_topology_map(char *sib_core, int sib_core_nr,
 		sib_thr += strlen(sib_thr) + 1;
 	}
 
-	topology_map = malloc(sizeof(int) * MAX_NR_CPUS);
+	topology_map = malloc(sizeof(int) * nr_cpus_onln);
 	if (!topology_map) {
 		fprintf(stderr, "topology: no memory\n");
 		goto exit;
 	}
 
-	for (i = 0; i < MAX_NR_CPUS; i++)
+	for (i = 0; i < nr_cpus_onln; i++)
 		topology_map[i] = -1;
 
 	scan_core_topology(topology_map, &t);
-- 
2.12.3


^ permalink raw reply related	[flat|nested] 2+ messages in thread
* Re: [PATCH] [PATCH v2] perf: Modify MAX_NR_CPUS and MAX_CACHES
  2019-06-28 15:35 [PATCH] [PATCH v2] perf: Modify MAX_NR_CPUS and MAX_CACHES Kyle Meyer
@ 2019-07-17  7:30 ` Jiri Olsa
  0 siblings, 0 replies; 2+ messages in thread
From: Jiri Olsa @ 2019-07-17  7:30 UTC (permalink / raw)
  To: Kyle Meyer
  Cc: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
	Alexander Shishkin, Namhyung Kim, linux-kernel, Russ Anderson,
	Kyle Meyer

On Fri, Jun 28, 2019 at 10:35:55AM -0500, Kyle Meyer wrote:
> Perf surpasses the limit of MAX_NR_CPUS and MAX_CACHES while attempting to
> profile 1024 or more CPUs. Increase and/or make each limit dynamic to
> regain normal functionality.
> 
> Before:
> 	perf record -a
> 	[ perf record: Woken up X times to write data ]
> 	way too many cpu caches..
> 	[ perf record: Captured and wrote X MB perf.data (X samples) ]
> 
> 	perf report -C 1024
> 	Error: failed to set  cpu bitmap
> 	Requested CPU 1024 too large. Consider raising MAX_NR_CPUS
> 
> After:
> 	perf record -a
> 	[ perf record: Woken up X times to write data ]
> 	[ perf record: Captured and wrote X MB perf.data (X samples) ]
> 
> 	perf report -C 1024
> 	...
> 
> The variables nr_cpus_onln and max_caches are alternatives for MAX_NR_CPUS
> and MAX_CACHES, they are initialized at runtime. MAX_NR_CPUS is increased
> from 1024 to 2048 as it is still used by DECLARE_BITMAP() at compile time,
> nr_cpus_onln replaces it elsewhere throughout perf.

I overlooked this one and it no longer applies because of
another change from you:
  9f94c7f947e9 perf tools: Increase MAX_NR_CPUS and MAX_CACHES

my worry here (did not check completely) is that some paths you
changed can't use number of cpus from sysconf(_SC_NPROCESSORS_ONLN),
because they are within the report code path, and the data can come
from another machine with different number of cpus

jirka


> 
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> Cc: Jiri Olsa <jolsa@redhat.com>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: linux-kernel@vger.kernel.org
> Cc: Russ Anderson <russ.anderson@hpe.com>
> Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
> ---
>  tools/perf/perf.c           |  6 ++++++
>  tools/perf/perf.h           |  3 ++-
>  tools/perf/util/cpumap.c    |  6 +++---
>  tools/perf/util/header.c    |  7 +++----
>  tools/perf/util/machine.c   | 11 +++++------
>  tools/perf/util/session.c   |  5 ++---
>  tools/perf/util/stat.c      |  4 ++--
>  tools/perf/util/svghelper.c | 10 +++++-----
>  8 files changed, 28 insertions(+), 24 deletions(-)
> 
> diff --git a/tools/perf/perf.c b/tools/perf/perf.c
> index 72df4b6fa36f..c2c22476a65f 100644
> --- a/tools/perf/perf.c
> +++ b/tools/perf/perf.c
> @@ -427,6 +427,12 @@ int main(int argc, const char **argv)
>  	const char *cmd;
>  	char sbuf[STRERR_BUFSIZE];
>  
> +	nr_cpus_onln = sysconf(_SC_NPROCESSORS_ONLN);
> +	if (nr_cpus_onln < 0) {
> +		fprintf(stderr, "Cannot determine the number of CPUs currently online.\n");
> +		goto out;
> +	}
> +	
>  	/* libsubcmd init */
>  	exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
>  	pager_init(PERF_PAGER_ENVIRONMENT);
> diff --git a/tools/perf/perf.h b/tools/perf/perf.h
> index 711e009381ec..603391cac85b 100644
> --- a/tools/perf/perf.h
> +++ b/tools/perf/perf.h
> @@ -26,9 +26,10 @@ static inline unsigned long long rdclock(void)
>  }
>  
>  #ifndef MAX_NR_CPUS
> -#define MAX_NR_CPUS			1024
> +#define MAX_NR_CPUS			2048
>  #endif
>  
> +int nr_cpus_onln;
>  extern const char *input_name;
>  extern bool perf_host, perf_guest;
>  extern const char perf_version_string[];
> diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
> index c11a459ca582..83c05afef063 100644
> --- a/tools/perf/util/cpumap.c
> +++ b/tools/perf/util/cpumap.c
> @@ -72,7 +72,7 @@ struct cpu_map *cpu_map__read(FILE *file)
>  			int new_max = nr_cpus + cpu - prev - 1;
>  
>  			if (new_max >= max_entries) {
> -				max_entries = new_max + MAX_NR_CPUS / 2;
> +				max_entries = new_max + nr_cpus_onln / 2;
>  				tmp = realloc(tmp_cpus, max_entries * sizeof(int));
>  				if (tmp == NULL)
>  					goto out_free_tmp;
> @@ -83,7 +83,7 @@ struct cpu_map *cpu_map__read(FILE *file)
>  				tmp_cpus[nr_cpus++] = prev;
>  		}
>  		if (nr_cpus == max_entries) {
> -			max_entries += MAX_NR_CPUS;
> +			max_entries += nr_cpus_onln;
>  			tmp = realloc(tmp_cpus, max_entries * sizeof(int));
>  			if (tmp == NULL)
>  				goto out_free_tmp;
> @@ -170,7 +170,7 @@ struct cpu_map *cpu_map__new(const char *cpu_list)
>  					goto invalid;
>  
>  			if (nr_cpus == max_entries) {
> -				max_entries += MAX_NR_CPUS;
> +				max_entries += nr_cpus_onln;
>  				tmp = realloc(tmp_cpus, max_entries * sizeof(int));
>  				if (tmp == NULL)
>  					goto invalid;
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 06ddb6618ef3..78f1acb069ed 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -1121,16 +1121,15 @@ static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
>  	return 0;
>  }
>  
> -#define MAX_CACHES 2000
> -
>  static int write_cache(struct feat_fd *ff,
>  		       struct perf_evlist *evlist __maybe_unused)
>  {
> -	struct cpu_cache_level caches[MAX_CACHES];
> +	u32 max_caches = (nr_cpus_onln * 4);
> +	struct cpu_cache_level caches[max_caches];
>  	u32 cnt = 0, i, version = 1;
>  	int ret;
>  
> -	ret = build_caches(caches, MAX_CACHES, &cnt);
> +	ret = build_caches(caches, max_caches, &cnt);
>  	if (ret)
>  		goto out;
>  
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 17eec39e775e..b4d792dbeb1f 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -2593,7 +2593,7 @@ int __machine__synthesize_threads(struct machine *machine, struct perf_tool *too
>  
>  pid_t machine__get_current_tid(struct machine *machine, int cpu)
>  {
> -	if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid)
> +	if (cpu < 0 || cpu >= nr_cpus_onln || !machine->current_tid)
>  		return -1;
>  
>  	return machine->current_tid[cpu];
> @@ -2610,16 +2610,15 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
>  	if (!machine->current_tid) {
>  		int i;
>  
> -		machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t));
> +		machine->current_tid = calloc(nr_cpus_onln, sizeof(pid_t));
>  		if (!machine->current_tid)
>  			return -ENOMEM;
> -		for (i = 0; i < MAX_NR_CPUS; i++)
> +		for (i = 0; i < nr_cpus_onln; i++)
>  			machine->current_tid[i] = -1;
>  	}
>  
> -	if (cpu >= MAX_NR_CPUS) {
> -		pr_err("Requested CPU %d too large. ", cpu);
> -		pr_err("Consider raising MAX_NR_CPUS\n");
> +	if (cpu >= nr_cpus_onln) {
> +		pr_err("Requested CPU %d too large, there are %d CPUs currently online.\n", cpu, nr_cpus_onln);
>  		return -EINVAL;
>  	}
>  
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 54cf163347f7..8641364555fb 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -2289,9 +2289,8 @@ int perf_session__cpu_bitmap(struct perf_session *session,
>  	for (i = 0; i < map->nr; i++) {
>  		int cpu = map->map[i];
>  
> -		if (cpu >= MAX_NR_CPUS) {
> -			pr_err("Requested CPU %d too large. "
> -			       "Consider raising MAX_NR_CPUS\n", cpu);
> +		if (cpu >= nr_cpus_onln) {
> +			pr_err("Requested CPU %d too large, there are %d CPUs currently online.\n", cpu, nr_cpus_onln);
>  			goto out_delete_map;
>  		}
>  
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index d91fe754b6d2..9d4a3b96496a 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -207,7 +207,7 @@ void perf_evlist__reset_stats(struct perf_evlist *evlist)
>  static void zero_per_pkg(struct perf_evsel *counter)
>  {
>  	if (counter->per_pkg_mask)
> -		memset(counter->per_pkg_mask, 0, MAX_NR_CPUS);
> +		memset(counter->per_pkg_mask, 0, nr_cpus_onln);
>  }
>  
>  static int check_per_pkg(struct perf_evsel *counter,
> @@ -226,7 +226,7 @@ static int check_per_pkg(struct perf_evsel *counter,
>  		return 0;
>  
>  	if (!mask) {
> -		mask = zalloc(MAX_NR_CPUS);
> +		mask = zalloc(nr_cpus_onln);
>  		if (!mask)
>  			return -ENOMEM;
>  
> diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
> index fab8a048d31b..6a8241932dce 100644
> --- a/tools/perf/util/svghelper.c
> +++ b/tools/perf/util/svghelper.c
> @@ -705,7 +705,7 @@ static void scan_thread_topology(int *map, struct topology *t, int cpu, int *pos
>  
>  		for_each_set_bit(thr,
>  				 cpumask_bits(&t->sib_thr[i]),
> -				 MAX_NR_CPUS)
> +				 nr_cpus_onln)
>  			if (map[thr] == -1)
>  				map[thr] = (*pos)++;
>  	}
> @@ -720,7 +720,7 @@ static void scan_core_topology(int *map, struct topology *t)
>  	for (i = 0; i < t->sib_core_nr; i++)
>  		for_each_set_bit(cpu,
>  				 cpumask_bits(&t->sib_core[i]),
> -				 MAX_NR_CPUS)
> +				 nr_cpus_onln)
>  			scan_thread_topology(map, t, cpu, &pos);
>  }
>  
> @@ -737,7 +737,7 @@ static int str_to_bitmap(char *s, cpumask_t *b)
>  
>  	for (i = 0; i < m->nr; i++) {
>  		c = m->map[i];
> -		if (c >= MAX_NR_CPUS) {
> +		if (c >= nr_cpus_onln) {
>  			ret = -1;
>  			break;
>  		}
> @@ -784,13 +784,13 @@ int svg_build_topology_map(char *sib_core, int sib_core_nr,
>  		sib_thr += strlen(sib_thr) + 1;
>  	}
>  
> -	topology_map = malloc(sizeof(int) * MAX_NR_CPUS);
> +	topology_map = malloc(sizeof(int) * nr_cpus_onln);
>  	if (!topology_map) {
>  		fprintf(stderr, "topology: no memory\n");
>  		goto exit;
>  	}
>  
> -	for (i = 0; i < MAX_NR_CPUS; i++)
> +	for (i = 0; i < nr_cpus_onln; i++)
>  		topology_map[i] = -1;
>  
>  	scan_core_topology(topology_map, &t);
> -- 
> 2.12.3
> 

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2019-06-28 15:35 [PATCH] [PATCH v2] perf: Modify MAX_NR_CPUS and MAX_CACHES Kyle Meyer
2019-07-17  7:30 ` Jiri Olsa

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