[PATCH 04/43] perf tools: Increase MAX_NR_CPUS and MAX_CACHES

From: Arnaldo Carvalho de Melo
Date: Mon Jul 01 2019 - 22:26:40 EST


From: Kyle Meyer <kyle.meyer@xxxxxxx>

Attempting to profile 1024 or more CPUs with perf causes two errors:

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

Increasing MAX_NR_CPUS from 1024 to 2048 and redefining MAX_CACHES as
MAX_NR_CPUS * 4 returns normal functionality to perf:

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
...

Signed-off-by: Kyle Meyer <kyle.meyer@xxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20190620193630.154025-1-meyerk@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/perf.h | 2 +-
tools/perf/util/header.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 711e009381ec..74d0124d38f3 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -26,7 +26,7 @@ static inline unsigned long long rdclock(void)
}

#ifndef MAX_NR_CPUS
-#define MAX_NR_CPUS 1024
+#define MAX_NR_CPUS 2048
#endif

extern const char *input_name;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 06ddb6618ef3..abc9c2145efe 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1121,7 +1121,7 @@ static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
return 0;
}

-#define MAX_CACHES 2000
+#define MAX_CACHES (MAX_NR_CPUS * 4)

static int write_cache(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
--
2.20.1