[PATCH] perf: change samples type to unsigned long long

[PATCH] perf: change samples type to unsigned long long

[Yang Shi]

When run "perf record -e", the number of samples showed up is wrong on some
32 bit systems, i.e. powerpc and arm.

For example, run the below commands on 32 bit powerpc:

perf probe -x /lib/libc.so.6 malloc
perf record -e probe_libc:malloc -a ls
perf.data
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.036 MB perf.data (13829241621624967218 samples) ]

Actually, "perf script" just shows 21 samples. The number of samples is also
absurd since samples is long type, but it is printed as PRIu64.

Build test is run on x86-64, x86, aarch64, arm, mips, ppc and ppc64.

Signed-off-by: Yang Shi <yang.shi@linaro.org>
---
 tools/perf/builtin-record.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 142eeb3..e54aa4c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -49,7 +49,7 @@ struct record {
 	int			realtime_prio;
 	bool			no_buildid;
 	bool			no_buildid_cache;
-	long			samples;
+	unsigned long long	samples;
 };
 
 static int record__write(struct record *rec, void *bf, size_t size)
-- 
2.0.2

Re: [PATCH] perf: change samples type to unsigned long long

[Arnaldo Carvalho de Melo]

Em Tue, Sep 29, 2015 at 02:49:43PM -0700, Yang Shi escreveu:
> When run "perf record -e", the number of samples showed up is wrong on some
> 32 bit systems, i.e. powerpc and arm.
> 
> For example, run the below commands on 32 bit powerpc:
> 
> perf probe -x /lib/libc.so.6 malloc
> perf record -e probe_libc:malloc -a ls
> perf.data
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.036 MB perf.data (13829241621624967218 samples) ]
> 
> Actually, "perf script" just shows 21 samples. The number of samples is also
> absurd since samples is long type, but it is printed as PRIu64.
> 
> Build test is run on x86-64, x86, aarch64, arm, mips, ppc and ppc64.

Sure?

  AR       /tmp/build/perf/libperf.a
builtin-record.c: In function ‘__cmd_record’:
builtin-record.c:689:12: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]

- Arnaldo
 
> Signed-off-by: Yang Shi <yang.shi@linaro.org>
> ---
>  tools/perf/builtin-record.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 142eeb3..e54aa4c 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -49,7 +49,7 @@ struct record {
>  	int			realtime_prio;
>  	bool			no_buildid;
>  	bool			no_buildid_cache;
> -	long			samples;
> +	unsigned long long	samples;
>  };
>  
>  static int record__write(struct record *rec, void *bf, size_t size)
> -- 
> 2.0.2

Re: [PATCH] perf: change samples type to unsigned long long

[Arnaldo Carvalho de Melo]

Em Fri, Oct 02, 2015 at 04:08:38PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Sep 29, 2015 at 02:49:43PM -0700, Yang Shi escreveu:
> > When run "perf record -e", the number of samples showed up is wrong on some
> > 32 bit systems, i.e. powerpc and arm.
> > 
> > For example, run the below commands on 32 bit powerpc:
> > 
> > perf probe -x /lib/libc.so.6 malloc
> > perf record -e probe_libc:malloc -a ls
> > perf.data
> > [ perf record: Woken up 1 times to write data ]
> > [ perf record: Captured and wrote 0.036 MB perf.data (13829241621624967218 samples) ]
> > 
> > Actually, "perf script" just shows 21 samples. The number of samples is also
> > absurd since samples is long type, but it is printed as PRIu64.
> > 
> > Build test is run on x86-64, x86, aarch64, arm, mips, ppc and ppc64.
> 
> Sure?
> 
>   AR       /tmp/build/perf/libperf.a
> builtin-record.c: In function ‘__cmd_record’:
> builtin-record.c:689:12: error: comparison between signed and unsigned
> integer expressions [-Werror=sign-compare]

You missed something important, I am fixing this and applying your
patch:

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 974065f8ce80..24ace2f318c1 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -667,7 +667,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 
 	auxtrace_snapshot_enabled = 1;
 	for (;;) {
-		int hits = rec->samples;
+		unsigned long long hits = rec->samples;
 
 		if (record__mmap_read_all(rec) < 0) {
 			auxtrace_snapshot_enabled = 0;

Re: [PATCH] perf: change samples type to unsigned long long

[Shi, Yang]

On 10/2/2015 12:10 PM, Arnaldo Carvalho de Melo wrote:
> Em Fri, Oct 02, 2015 at 04:08:38PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Tue, Sep 29, 2015 at 02:49:43PM -0700, Yang Shi escreveu:
>>> When run "perf record -e", the number of samples showed up is wrong on some
>>> 32 bit systems, i.e. powerpc and arm.
>>>
>>> For example, run the below commands on 32 bit powerpc:
>>>
>>> perf probe -x /lib/libc.so.6 malloc
>>> perf record -e probe_libc:malloc -a ls
>>> perf.data
>>> [ perf record: Woken up 1 times to write data ]
>>> [ perf record: Captured and wrote 0.036 MB perf.data (13829241621624967218 samples) ]
>>>
>>> Actually, "perf script" just shows 21 samples. The number of samples is also
>>> absurd since samples is long type, but it is printed as PRIu64.
>>>
>>> Build test is run on x86-64, x86, aarch64, arm, mips, ppc and ppc64.
>>
>> Sure?
>>
>>    AR       /tmp/build/perf/libperf.a
>> builtin-record.c: In function ‘__cmd_record’:
>> builtin-record.c:689:12: error: comparison between signed and unsigned
>> integer expressions [-Werror=sign-compare]
>
> You missed something important, I am fixing this and applying your
> patch:

Thanks a lot. Yes, it was wrong, however, my compiler just throws a 
warning instead of an error. And, the warning was hidden by my OE build 
environment.

Regards,
Yang

>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 974065f8ce80..24ace2f318c1 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -667,7 +667,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>
>   	auxtrace_snapshot_enabled = 1;
>   	for (;;) {
> -		int hits = rec->samples;
> +		unsigned long long hits = rec->samples;
>
>   		if (record__mmap_read_all(rec) < 0) {
>   			auxtrace_snapshot_enabled = 0;
>

[tip:perf/core] perf record: Change 'record.samples' type to unsigned long long

[tip-bot for Yang Shi]

Commit-ID:  9f065194e2a505bb6fd23946b410a0036e9de2ca
Gitweb:     http://git.kernel.org/tip/9f065194e2a505bb6fd23946b410a0036e9de2ca
Author:     Yang Shi <yang.shi@linaro.org>
AuthorDate: Tue, 29 Sep 2015 14:49:43 -0700
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 2 Oct 2015 16:11:08 -0300

perf record: Change 'record.samples' type to unsigned long long

When run "perf record -e", the number of samples showed up is wrong on some
32 bit systems, i.e. powerpc and arm.

For example, run the below commands on 32 bit powerpc:

  perf probe -x /lib/libc.so.6 malloc
  perf record -e probe_libc:malloc -a ls perf.data
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.036 MB perf.data (13829241621624967218 samples) ]

Actually, "perf script" just shows 21 samples. The number of samples is also
absurd since samples is long type, but it is printed as PRIu64.

Build test ran on x86-64, x86, aarch64, arm, mips, ppc and ppc64.

Signed-off-by: Yang Shi <yang.shi@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Link: http://lkml.kernel.org/r/1443563383-4064-1-git-send-email-yang.shi@linaro.org
[ Bumped the 'hits' var used together with record.samples to 'unsigned long long' too ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-record.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5e01c07..24ace2f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -49,7 +49,7 @@ struct record {
 	int			realtime_prio;
 	bool			no_buildid;
 	bool			no_buildid_cache;
-	long			samples;
+	unsigned long long	samples;
 };
 
 static int record__write(struct record *rec, void *bf, size_t size)
@@ -667,7 +667,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 
 	auxtrace_snapshot_enabled = 1;
 	for (;;) {
-		int hits = rec->samples;
+		unsigned long long hits = rec->samples;
 
 		if (record__mmap_read_all(rec) < 0) {
 			auxtrace_snapshot_enabled = 0;