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[PATCH] perf: Fix missing raw data on tracepoint events

James Clark posted 1 patch 3 years, 5 months ago
There is a newer version of this series
kernel/events/core.c | 1 +
1 file changed, 1 insertion(+)
[PATCH] perf: Fix missing raw data on tracepoint events
Posted by James Clark 3 years, 5 months ago 
Since commit 838d9bb62d13 ("perf: Use sample_flags for raw_data")
raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
field not being set. Fix this by setting it for tracepoint events.

This fixes the following test failure:

  perf test "sched_switch" -vvv

   35: Track with sched_switch
  --- start ---
  test child forked, pid 1828
  ...
  Using CPUID 0x00000000410fd400
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  Missing sched_switch events
  4613 events recorded
  test child finished with -1
  ---- end ----
  Track with sched_switch: FAILED!

Fixes: 838d9bb62d13 ("perf: Use sample_flags for raw_data")
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: James Clark <james.clark@arm.com>
---
 kernel/events/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index b981b879bcd8..824c23830272 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9759,6 +9759,7 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
 
 	perf_sample_data_init(&data, 0, 0);
 	data.raw = &raw;
+	data.sample_flags |= PERF_SAMPLE_RAW;
 
 	perf_trace_buf_update(record, event_type);
 
-- 
2.28.0
Re: [PATCH] perf: Fix missing raw data on tracepoint events
Posted by Peter Zijlstra 3 years, 5 months ago 
On Wed, Oct 12, 2022 at 03:38:57PM +0100, James Clark wrote:
> Since commit 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
> field not being set. Fix this by setting it for tracepoint events.
> 
> This fixes the following test failure:
> 
>   perf test "sched_switch" -vvv
> 
>    35: Track with sched_switch
>   --- start ---
>   test child forked, pid 1828
>   ...
>   Using CPUID 0x00000000410fd400
>   sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>   sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>   Missing sched_switch events
>   4613 events recorded
>   test child finished with -1
>   ---- end ----
>   Track with sched_switch: FAILED!
> 
> Fixes: 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> Signed-off-by: James Clark <james.clark@arm.com>

Thanks!
Re: [PATCH] perf: Fix missing raw data on tracepoint events
Posted by Athira Rajeev 3 years, 5 months ago 

> On 12-Oct-2022, at 8:08 PM, James Clark <james.clark@arm.com> wrote:
> 
> Since commit 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
> field not being set. Fix this by setting it for tracepoint events.
> 
> This fixes the following test failure:
> 
>  perf test "sched_switch" -vvv
> 
>   35: Track with sched_switch
>  --- start ---
>  test child forked, pid 1828
>  ...
>  Using CPUID 0x00000000410fd400
>  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>  Missing sched_switch events
>  4613 events recorded
>  test child finished with -1
>  ---- end ----
>  Track with sched_switch: FAILED!
> 
> Fixes: 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> Signed-off-by: James Clark <james.clark@arm.com>

Hi James, 

Thanks for the fix. I was getting similar issue with “perf trace” and it works with this fix.

Tested-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>


> ---
> kernel/events/core.c | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index b981b879bcd8..824c23830272 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -9759,6 +9759,7 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
> 
> 	perf_sample_data_init(&data, 0, 0);
> 	data.raw = &raw;
> +	data.sample_flags |= PERF_SAMPLE_RAW;
> 
> 	perf_trace_buf_update(record, event_type);
> 
> -- 
> 2.28.0
>
Re: [PATCH] perf: Fix missing raw data on tracepoint events
Posted by SeongJae Park 3 years, 5 months ago 
On Wed, 12 Oct 2022 15:38:57 +0100 James Clark <james.clark@arm.com> wrote:

> Since commit 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
> field not being set. Fix this by setting it for tracepoint events.

I was also getting similar issue[1], and confirmed that this fixes it.  Thank
you for the fix!  Also, thank you for pointing me to this patch, Namhyung!

> 
> This fixes the following test failure:
> 
>   perf test "sched_switch" -vvv
> 
>    35: Track with sched_switch
>   --- start ---
>   test child forked, pid 1828
>   ...
>   Using CPUID 0x00000000410fd400
>   sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>   sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>   Missing sched_switch events
>   4613 events recorded
>   test child finished with -1
>   ---- end ----
>   Track with sched_switch: FAILED!
> 
> Fixes: 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> Signed-off-by: James Clark <james.clark@arm.com>

Tested-by: SeongJae Park <sj@kernel.org>


[1] https://lore.kernel.org/bpf/20221017192744.1403-1-sj@kernel.org/

Thanks,
SJ

> ---
>  kernel/events/core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index b981b879bcd8..824c23830272 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -9759,6 +9759,7 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
>  
>  	perf_sample_data_init(&data, 0, 0);
>  	data.raw = &raw;
> +	data.sample_flags |= PERF_SAMPLE_RAW;
>  
>  	perf_trace_buf_update(record, event_type);
>  
> -- 
> 2.28.0
Re: [PATCH] perf: Fix missing raw data on tracepoint events
Posted by Namhyung Kim 3 years, 5 months ago 
On Wed, Oct 12, 2022 at 7:39 AM James Clark <james.clark@arm.com> wrote:
>
> Since commit 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
> field not being set. Fix this by setting it for tracepoint events.
>
> This fixes the following test failure:
>
>   perf test "sched_switch" -vvv
>
>    35: Track with sched_switch
>   --- start ---
>   test child forked, pid 1828
>   ...
>   Using CPUID 0x00000000410fd400
>   sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>   sched_switch: cpu: 2 prev_tid -14687 next_tid 0
>   Missing sched_switch events
>   4613 events recorded
>   test child finished with -1
>   ---- end ----
>   Track with sched_switch: FAILED!
>
> Fixes: 838d9bb62d13 ("perf: Use sample_flags for raw_data")
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> Signed-off-by: James Clark <james.clark@arm.com>

Ouch.. thanks for the fix.

Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks,
Namhyung


> ---
>  kernel/events/core.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index b981b879bcd8..824c23830272 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -9759,6 +9759,7 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
>
>         perf_sample_data_init(&data, 0, 0);
>         data.raw = &raw;
> +       data.sample_flags |= PERF_SAMPLE_RAW;
>
>         perf_trace_buf_update(record, event_type);
>
> --
> 2.28.0
>
[tip: perf/urgent] perf: Fix missing raw data on tracepoint events
Posted by tip-bot2 for James Clark 3 years, 5 months ago 
The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     4b66ff46f2e18b1d32e18c881799ef911606f3be
Gitweb:        https://git.kernel.org/tip/4b66ff46f2e18b1d32e18c881799ef911606f3be
Author:        James Clark <james.clark@arm.com>
AuthorDate:    Wed, 12 Oct 2022 15:38:57 +01:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Thu, 27 Oct 2022 10:27:30 +02:00

perf: Fix missing raw data on tracepoint events

Since commit 838d9bb62d13 ("perf: Use sample_flags for raw_data")
raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
field not being set. Fix this by setting it for tracepoint events.

This fixes the following test failure:

  perf test "sched_switch" -vvv

   35: Track with sched_switch
  --- start ---
  test child forked, pid 1828
  ...
  Using CPUID 0x00000000410fd400
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  Missing sched_switch events
  4613 events recorded
  test child finished with -1
  ---- end ----
  Track with sched_switch: FAILED!

Fixes: 838d9bb62d13 ("perf: Use sample_flags for raw_data")
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: SeongJae Park <sj@kernel.org>
Tested-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20221012143857.48198-1-james.clark@arm.com
---
 kernel/events/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 01933db..4ec3717 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9846,6 +9846,7 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
 
 	perf_sample_data_init(&data, 0, 0);
 	data.raw = &raw;
+	data.sample_flags |= PERF_SAMPLE_RAW;
 
 	perf_trace_buf_update(record, event_type);

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