2014-10-24 01:47:14

by Wang Nan

Subject: [PATCH v3] perf tools: makes CPUINFO_PROC to array for different kernel version

After kernel 3.7 (commit b4b8f770eb10a1bccaf8aa0ec1956e2dd7ed1e0a),
/proc/cpuinfo replaces 'Processor' to 'model name'. This patch makes
CPUINFO_PROC to an array and provides two choices for ARM, makes it
compatible for different kernel version.

v1 -> v2: minor changes as suggested by Namhyung Kim:

- Doesn't pass @h and @evlist to __write_cpudesc;
- Coding style fix.

v2 -> v3:
- Rebase:
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core

Signed-off-by: Wang Nan <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/perf-sys.h | 30 +++++++++++++++---------------
tools/perf/util/header.c | 27 +++++++++++++++++++++------
2 files changed, 36 insertions(+), 21 deletions(-)

diff --git a/tools/perf/perf-sys.h b/tools/perf/perf-sys.h
index 937e432..a3b13d7 100644
--- a/tools/perf/perf-sys.h
+++ b/tools/perf/perf-sys.h
@@ -13,7 +13,7 @@
#define wmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
#define rmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
#define cpu_relax() asm volatile("rep; nop" ::: "memory");
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 336
#endif
@@ -30,7 +30,7 @@
#define wmb() asm volatile("sfence" ::: "memory")
#define rmb() asm volatile("lfence" ::: "memory")
#define cpu_relax() asm volatile("rep; nop" ::: "memory");
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 298
#endif
@@ -47,14 +47,14 @@
#define mb() asm volatile ("sync" ::: "memory")
#define wmb() asm volatile ("sync" ::: "memory")
#define rmb() asm volatile ("sync" ::: "memory")
-#define CPUINFO_PROC "cpu"
+#define CPUINFO_PROC {"cpu"}
#endif

#ifdef __s390__
#define mb() asm volatile("bcr 15,0" ::: "memory")
#define wmb() asm volatile("bcr 15,0" ::: "memory")
#define rmb() asm volatile("bcr 15,0" ::: "memory")
-#define CPUINFO_PROC "vendor_id"
+#define CPUINFO_PROC {"vendor_id"}
#endif

#ifdef __sh__
@@ -67,14 +67,14 @@
# define wmb() asm volatile("" ::: "memory")
# define rmb() asm volatile("" ::: "memory")
#endif
-#define CPUINFO_PROC "cpu type"
+#define CPUINFO_PROC {"cpu type"}
#endif

#ifdef __hppa__
#define mb() asm volatile("" ::: "memory")
#define wmb() asm volatile("" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "cpu"
+#define CPUINFO_PROC {"cpu"}
#endif

#ifdef __sparc__
@@ -87,14 +87,14 @@
#endif
#define wmb() asm volatile("":::"memory")
#define rmb() asm volatile("":::"memory")
-#define CPUINFO_PROC "cpu"
+#define CPUINFO_PROC {"cpu"}
#endif

#ifdef __alpha__
#define mb() asm volatile("mb" ::: "memory")
#define wmb() asm volatile("wmb" ::: "memory")
#define rmb() asm volatile("mb" ::: "memory")
-#define CPUINFO_PROC "cpu model"
+#define CPUINFO_PROC {"cpu model"}
#endif

#ifdef __ia64__
@@ -102,7 +102,7 @@
#define wmb() asm volatile ("mf" ::: "memory")
#define rmb() asm volatile ("mf" ::: "memory")
#define cpu_relax() asm volatile ("hint @pause" ::: "memory")
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#endif

#ifdef __arm__
@@ -113,7 +113,7 @@
#define mb() ((void(*)(void))0xffff0fa0)()
#define wmb() ((void(*)(void))0xffff0fa0)()
#define rmb() ((void(*)(void))0xffff0fa0)()
-#define CPUINFO_PROC "Processor"
+#define CPUINFO_PROC {"model name", "Processor"}
#endif

#ifdef __aarch64__
@@ -133,28 +133,28 @@
: "memory")
#define wmb() mb()
#define rmb() mb()
-#define CPUINFO_PROC "cpu model"
+#define CPUINFO_PROC {"cpu model"}
#endif

#ifdef __arc__
#define mb() asm volatile("" ::: "memory")
#define wmb() asm volatile("" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "Processor"
+#define CPUINFO_PROC {"Processor"}
#endif

#ifdef __metag__
#define mb() asm volatile("" ::: "memory")
#define wmb() asm volatile("" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "CPU"
+#define CPUINFO_PROC {"CPU"}
#endif

#ifdef __xtensa__
#define mb() asm volatile("memw" ::: "memory")
#define wmb() asm volatile("memw" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "core ID"
+#define CPUINFO_PROC {"core ID"}
#endif

#ifdef __tile__
@@ -162,7 +162,7 @@
#define wmb() asm volatile ("mf" ::: "memory")
#define rmb() asm volatile ("mf" ::: "memory")
#define cpu_relax() asm volatile ("mfspr zero, PASS" ::: "memory")
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#endif

#define barrier() asm volatile ("" ::: "memory")
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 39b80ac..0ecf4a3 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -579,16 +579,12 @@ static int write_version(int fd, struct perf_header *h __maybe_unused,
return do_write_string(fd, perf_version_string);
}

-static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist __maybe_unused)
+static int __write_cpudesc(int fd, const char *cpuinfo_proc)
{
-#ifndef CPUINFO_PROC
-#define CPUINFO_PROC NULL
-#endif
FILE *file;
char *buf = NULL;
char *s, *p;
- const char *search = CPUINFO_PROC;
+ const char *search = cpuinfo_proc;
size_t len = 0;
int ret = -1;

@@ -640,6 +636,25 @@ done:
return ret;
}

+static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused)
+{
+#ifndef CPUINFO_PROC
+#define CPUINFO_PROC {"model name", }
+#endif
+ const char *cpuinfo_procs[] = CPUINFO_PROC;
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
+ int ret;
+ ret = __write_cpudesc(fd, cpuinfo_procs[i]);
+ if (ret >= 0)
+ return ret;
+ }
+ return -1;
+}
+
+
static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
--
1.8.4

2014-10-24 01:57:26

by Arnaldo Carvalho de Melo

Subject: Re: [PATCH v3] perf tools: makes CPUINFO_PROC to array for different kernel version

Em Fri, Oct 24, 2014 at 09:45:26AM +0800, Wang Nan escreveu:
> After kernel 3.7 (commit b4b8f770eb10a1bccaf8aa0ec1956e2dd7ed1e0a),
> /proc/cpuinfo replaces 'Processor' to 'model name'. This patch makes
> CPUINFO_PROC to an array and provides two choices for ARM, makes it
> compatible for different kernel version.
>
> v1 -> v2: minor changes as suggested by Namhyung Kim:
>
> - Doesn't pass @h and @evlist to __write_cpudesc;
> - Coding style fix.
>
> v2 -> v3:
> - Rebase:
> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core

Thanks a lot, applying now.

- Arnaldo

> Signed-off-by: Wang Nan <[email protected]>
> Acked-by: Namhyung Kim <[email protected]>
> Cc: Arnaldo Carvalho de Melo <[email protected]>
> ---
> tools/perf/perf-sys.h | 30 +++++++++++++++---------------
> tools/perf/util/header.c | 27 +++++++++++++++++++++------
> 2 files changed, 36 insertions(+), 21 deletions(-)
>
> diff --git a/tools/perf/perf-sys.h b/tools/perf/perf-sys.h
> index 937e432..a3b13d7 100644
> --- a/tools/perf/perf-sys.h
> +++ b/tools/perf/perf-sys.h
> @@ -13,7 +13,7 @@
> #define wmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
> #define rmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
> #define cpu_relax() asm volatile("rep; nop" ::: "memory");
> -#define CPUINFO_PROC "model name"
> +#define CPUINFO_PROC {"model name"}
> #ifndef __NR_perf_event_open
> # define __NR_perf_event_open 336
> #endif
> @@ -30,7 +30,7 @@
> #define wmb() asm volatile("sfence" ::: "memory")
> #define rmb() asm volatile("lfence" ::: "memory")
> #define cpu_relax() asm volatile("rep; nop" ::: "memory");
> -#define CPUINFO_PROC "model name"
> +#define CPUINFO_PROC {"model name"}
> #ifndef __NR_perf_event_open
> # define __NR_perf_event_open 298
> #endif
> @@ -47,14 +47,14 @@
> #define mb() asm volatile ("sync" ::: "memory")
> #define wmb() asm volatile ("sync" ::: "memory")
> #define rmb() asm volatile ("sync" ::: "memory")
> -#define CPUINFO_PROC "cpu"
> +#define CPUINFO_PROC {"cpu"}
> #endif
>
> #ifdef __s390__
> #define mb() asm volatile("bcr 15,0" ::: "memory")
> #define wmb() asm volatile("bcr 15,0" ::: "memory")
> #define rmb() asm volatile("bcr 15,0" ::: "memory")
> -#define CPUINFO_PROC "vendor_id"
> +#define CPUINFO_PROC {"vendor_id"}
> #endif
>
> #ifdef __sh__
> @@ -67,14 +67,14 @@
> # define wmb() asm volatile("" ::: "memory")
> # define rmb() asm volatile("" ::: "memory")
> #endif
> -#define CPUINFO_PROC "cpu type"
> +#define CPUINFO_PROC {"cpu type"}
> #endif
>
> #ifdef __hppa__
> #define mb() asm volatile("" ::: "memory")
> #define wmb() asm volatile("" ::: "memory")
> #define rmb() asm volatile("" ::: "memory")
> -#define CPUINFO_PROC "cpu"
> +#define CPUINFO_PROC {"cpu"}
> #endif
>
> #ifdef __sparc__
> @@ -87,14 +87,14 @@
> #endif
> #define wmb() asm volatile("":::"memory")
> #define rmb() asm volatile("":::"memory")
> -#define CPUINFO_PROC "cpu"
> +#define CPUINFO_PROC {"cpu"}
> #endif
>
> #ifdef __alpha__
> #define mb() asm volatile("mb" ::: "memory")
> #define wmb() asm volatile("wmb" ::: "memory")
> #define rmb() asm volatile("mb" ::: "memory")
> -#define CPUINFO_PROC "cpu model"
> +#define CPUINFO_PROC {"cpu model"}
> #endif
>
> #ifdef __ia64__
> @@ -102,7 +102,7 @@
> #define wmb() asm volatile ("mf" ::: "memory")
> #define rmb() asm volatile ("mf" ::: "memory")
> #define cpu_relax() asm volatile ("hint @pause" ::: "memory")
> -#define CPUINFO_PROC "model name"
> +#define CPUINFO_PROC {"model name"}
> #endif
>
> #ifdef __arm__
> @@ -113,7 +113,7 @@
> #define mb() ((void(*)(void))0xffff0fa0)()
> #define wmb() ((void(*)(void))0xffff0fa0)()
> #define rmb() ((void(*)(void))0xffff0fa0)()
> -#define CPUINFO_PROC "Processor"
> +#define CPUINFO_PROC {"model name", "Processor"}
> #endif
>
> #ifdef __aarch64__
> @@ -133,28 +133,28 @@
> : "memory")
> #define wmb() mb()
> #define rmb() mb()
> -#define CPUINFO_PROC "cpu model"
> +#define CPUINFO_PROC {"cpu model"}
> #endif
>
> #ifdef __arc__
> #define mb() asm volatile("" ::: "memory")
> #define wmb() asm volatile("" ::: "memory")
> #define rmb() asm volatile("" ::: "memory")
> -#define CPUINFO_PROC "Processor"
> +#define CPUINFO_PROC {"Processor"}
> #endif
>
> #ifdef __metag__
> #define mb() asm volatile("" ::: "memory")
> #define wmb() asm volatile("" ::: "memory")
> #define rmb() asm volatile("" ::: "memory")
> -#define CPUINFO_PROC "CPU"
> +#define CPUINFO_PROC {"CPU"}
> #endif
>
> #ifdef __xtensa__
> #define mb() asm volatile("memw" ::: "memory")
> #define wmb() asm volatile("memw" ::: "memory")
> #define rmb() asm volatile("" ::: "memory")
> -#define CPUINFO_PROC "core ID"
> +#define CPUINFO_PROC {"core ID"}
> #endif
>
> #ifdef __tile__
> @@ -162,7 +162,7 @@
> #define wmb() asm volatile ("mf" ::: "memory")
> #define rmb() asm volatile ("mf" ::: "memory")
> #define cpu_relax() asm volatile ("mfspr zero, PASS" ::: "memory")
> -#define CPUINFO_PROC "model name"
> +#define CPUINFO_PROC {"model name"}
> #endif
>
> #define barrier() asm volatile ("" ::: "memory")
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 39b80ac..0ecf4a3 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -579,16 +579,12 @@ static int write_version(int fd, struct perf_header *h __maybe_unused,
> return do_write_string(fd, perf_version_string);
> }
>
> -static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
> - struct perf_evlist *evlist __maybe_unused)
> +static int __write_cpudesc(int fd, const char *cpuinfo_proc)
> {
> -#ifndef CPUINFO_PROC
> -#define CPUINFO_PROC NULL
> -#endif
> FILE *file;
> char *buf = NULL;
> char *s, *p;
> - const char *search = CPUINFO_PROC;
> + const char *search = cpuinfo_proc;
> size_t len = 0;
> int ret = -1;
>
> @@ -640,6 +636,25 @@ done:
> return ret;
> }
>
> +static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
> + struct perf_evlist *evlist __maybe_unused)
> +{
> +#ifndef CPUINFO_PROC
> +#define CPUINFO_PROC {"model name", }
> +#endif
> + const char *cpuinfo_procs[] = CPUINFO_PROC;
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
> + int ret;
> + ret = __write_cpudesc(fd, cpuinfo_procs[i]);
> + if (ret >= 0)
> + return ret;
> + }
> + return -1;
> +}
> +
> +
> static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
> struct perf_evlist *evlist __maybe_unused)
> {
> --
> 1.8.4

2014-10-30 06:40:20

by tip-bot for Vasyl Gomonovych

Subject: [tip:perf/core] perf tools: Make CPUINFO_PROC an array to support different kernel versions

Commit-ID: 493c3031336a49bbd50777dc2adfa52a49933d43
Gitweb: http://git.kernel.org/tip/493c3031336a49bbd50777dc2adfa52a49933d43
Author: Wang Nan <[email protected]>
AuthorDate: Fri, 24 Oct 2014 09:45:26 +0800
Committer: Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Wed, 29 Oct 2014 10:27:36 -0200

perf tools: Make CPUINFO_PROC an array to support different kernel versions

After kernel 3.7 (commit b4b8f770eb10a1bccaf8aa0ec1956e2dd7ed1e0a),
/proc/cpuinfo replaces 'Processor' to 'model name'.

This patch makes CPUINFO_PROC to an array and provides two choices for
ARM, makes it compatible for different kernel version.

v1 -> v2: minor changes as suggested by Namhyung Kim:

- Doesn't pass @h and @evlist to __write_cpudesc;
- Coding style fix.

v2 -> v3:
- Rebase:
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core

Signed-off-by: Wang Nan <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/perf-sys.h | 30 +++++++++++++++---------------
tools/perf/util/header.c | 27 +++++++++++++++++++++------
2 files changed, 36 insertions(+), 21 deletions(-)

diff --git a/tools/perf/perf-sys.h b/tools/perf/perf-sys.h
index 937e432..a3b13d7 100644
--- a/tools/perf/perf-sys.h
+++ b/tools/perf/perf-sys.h
@@ -13,7 +13,7 @@
#define wmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
#define rmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
#define cpu_relax() asm volatile("rep; nop" ::: "memory");
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 336
#endif
@@ -30,7 +30,7 @@
#define wmb() asm volatile("sfence" ::: "memory")
#define rmb() asm volatile("lfence" ::: "memory")
#define cpu_relax() asm volatile("rep; nop" ::: "memory");
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 298
#endif
@@ -47,14 +47,14 @@
#define mb() asm volatile ("sync" ::: "memory")
#define wmb() asm volatile ("sync" ::: "memory")
#define rmb() asm volatile ("sync" ::: "memory")
-#define CPUINFO_PROC "cpu"
+#define CPUINFO_PROC {"cpu"}
#endif

#ifdef __s390__
#define mb() asm volatile("bcr 15,0" ::: "memory")
#define wmb() asm volatile("bcr 15,0" ::: "memory")
#define rmb() asm volatile("bcr 15,0" ::: "memory")
-#define CPUINFO_PROC "vendor_id"
+#define CPUINFO_PROC {"vendor_id"}
#endif

#ifdef __sh__
@@ -67,14 +67,14 @@
# define wmb() asm volatile("" ::: "memory")
# define rmb() asm volatile("" ::: "memory")
#endif
-#define CPUINFO_PROC "cpu type"
+#define CPUINFO_PROC {"cpu type"}
#endif

#ifdef __hppa__
#define mb() asm volatile("" ::: "memory")
#define wmb() asm volatile("" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "cpu"
+#define CPUINFO_PROC {"cpu"}
#endif

#ifdef __sparc__
@@ -87,14 +87,14 @@
#endif
#define wmb() asm volatile("":::"memory")
#define rmb() asm volatile("":::"memory")
-#define CPUINFO_PROC "cpu"
+#define CPUINFO_PROC {"cpu"}
#endif

#ifdef __alpha__
#define mb() asm volatile("mb" ::: "memory")
#define wmb() asm volatile("wmb" ::: "memory")
#define rmb() asm volatile("mb" ::: "memory")
-#define CPUINFO_PROC "cpu model"
+#define CPUINFO_PROC {"cpu model"}
#endif

#ifdef __ia64__
@@ -102,7 +102,7 @@
#define wmb() asm volatile ("mf" ::: "memory")
#define rmb() asm volatile ("mf" ::: "memory")
#define cpu_relax() asm volatile ("hint @pause" ::: "memory")
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#endif

#ifdef __arm__
@@ -113,7 +113,7 @@
#define mb() ((void(*)(void))0xffff0fa0)()
#define wmb() ((void(*)(void))0xffff0fa0)()
#define rmb() ((void(*)(void))0xffff0fa0)()
-#define CPUINFO_PROC "Processor"
+#define CPUINFO_PROC {"model name", "Processor"}
#endif

#ifdef __aarch64__
@@ -133,28 +133,28 @@
: "memory")
#define wmb() mb()
#define rmb() mb()
-#define CPUINFO_PROC "cpu model"
+#define CPUINFO_PROC {"cpu model"}
#endif

#ifdef __arc__
#define mb() asm volatile("" ::: "memory")
#define wmb() asm volatile("" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "Processor"
+#define CPUINFO_PROC {"Processor"}
#endif

#ifdef __metag__
#define mb() asm volatile("" ::: "memory")
#define wmb() asm volatile("" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "CPU"
+#define CPUINFO_PROC {"CPU"}
#endif

#ifdef __xtensa__
#define mb() asm volatile("memw" ::: "memory")
#define wmb() asm volatile("memw" ::: "memory")
#define rmb() asm volatile("" ::: "memory")
-#define CPUINFO_PROC "core ID"
+#define CPUINFO_PROC {"core ID"}
#endif

#ifdef __tile__
@@ -162,7 +162,7 @@
#define wmb() asm volatile ("mf" ::: "memory")
#define rmb() asm volatile ("mf" ::: "memory")
#define cpu_relax() asm volatile ("mfspr zero, PASS" ::: "memory")
-#define CPUINFO_PROC "model name"
+#define CPUINFO_PROC {"model name"}
#endif

#define barrier() asm volatile ("" ::: "memory")
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ce0de00..26f5b2f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -579,16 +579,12 @@ static int write_version(int fd, struct perf_header *h __maybe_unused,
return do_write_string(fd, perf_version_string);
}

-static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist __maybe_unused)
+static int __write_cpudesc(int fd, const char *cpuinfo_proc)
{
-#ifndef CPUINFO_PROC
-#define CPUINFO_PROC NULL
-#endif
FILE *file;
char *buf = NULL;
char *s, *p;
- const char *search = CPUINFO_PROC;
+ const char *search = cpuinfo_proc;
size_t len = 0;
int ret = -1;

@@ -638,6 +634,25 @@ done:
return ret;
}

+static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused)
+{
+#ifndef CPUINFO_PROC
+#define CPUINFO_PROC {"model name", }
+#endif
+ const char *cpuinfo_procs[] = CPUINFO_PROC;
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
+ int ret;
+ ret = __write_cpudesc(fd, cpuinfo_procs[i]);
+ if (ret >= 0)
+ return ret;
+ }
+ return -1;
+}
+
+
static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{