[PATCH 1/2] perf script: Fix perf script -F +metric

[PATCH 1/2] perf script: Fix perf script -F +metric

[Andi Kleen]

This fixes a regression with perf script -F +metric originally caused by :

commit 37cc8ad77cf81f3ffd226856c367b0e15333a738
Author: Ian Rogers <irogers@google.com>
Date:   Sun Feb 19 01:28:46 2023 -0800

    perf metric: Directly use counts rather than saved_value

In the perf script environment the evsel wouldn't allocate an aggr
values array, which led to a -1 reference because the metric
evaluation would try to reference NULL - 1 (for aggr_idx)

Give the perf script evsels a single CPU aggr setup. That's
enough because the groups are always contiguous, so no need
to store more than one CPU's worth of values.

Before

% perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
% perf script -F +metric
Segmentation fault (core dumped)

After:

% perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
...
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.028 MB perf.data (90 samples) ]
% perf script -F +metric
       perf-exec 1847557 264658.180789:       3009       cycles:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
       perf-exec 1847557 264658.180789:        382 instructions:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
       perf-exec 1847557 264658.180789:         metric:    0.13  insn per cycle
...

Fixes: 37cc8ad77cf8 ("perf metric: Directly use counts rather ...")
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/builtin-script.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index c16224b1fef3..4aab194b4b1a 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -84,7 +84,7 @@ static bool			system_wide;
 static bool			print_flags;
 static const char		*cpu_list;
 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
-static struct perf_stat_config	stat_config;
+static struct perf_stat_config	stat_config = { .aggr_map = &(struct cpu_aggr_map){ .nr = 1 } };
 static int			max_blocks;
 static bool			native_arch;
 static struct dlfilter		*dlfilter;
@@ -2133,12 +2133,14 @@ static void perf_sample__fprint_metric(struct perf_script *script,
 	if (evsel_script(leader)->gnum++ == 0)
 		perf_stat__reset_shadow_stats();
 	val = sample->period * evsel->scale;
+	/* Always use CPU 0 storage because the groups are contiguous. */
+	evsel->stats->aggr[0].counts.val = val;
 	evsel_script(evsel)->val = val;
 	if (evsel_script(leader)->gnum == leader->core.nr_members) {
 		for_each_group_member (ev2, leader) {
 			perf_stat__print_shadow_stats(&stat_config, ev2,
 						      evsel_script(ev2)->val,
-						      sample->cpu,
+						      0,
 						      &ctx,
 						      NULL);
 		}
-- 
2.45.2

[PATCH 2/2] Add a test case for perf script -F +metric

[Andi Kleen]

Just a simple test

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/tests/shell/script.sh | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/script.sh b/tools/perf/tests/shell/script.sh
index c1a603653662..cd9d41734021 100755
--- a/tools/perf/tests/shell/script.sh
+++ b/tools/perf/tests/shell/script.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # perf script tests
 # SPDX-License-Identifier: GPL-2.0
 
@@ -7,6 +7,7 @@ set -e
 temp_dir=$(mktemp -d /tmp/perf-test-script.XXXXXXXXXX)
 
 perfdatafile="${temp_dir}/perf.data"
+scriptoutput="${temp_dir}/script"
 db_test="${temp_dir}/db_test.py"
 
 err=0
@@ -88,8 +89,21 @@ test_parallel_perf()
 	echo "parallel-perf test [Success]"
 }
 
+test_metric()
+{
+	echo "script metric test"
+	if ! perf list | grep -q cycles ; then return ; fi
+	if ! perf list | grep -q instructions ; then return ; fi
+	perf record -e '{cycles,instructions}' -o "${perfdatafile}" bash -c 'for i in `seq 1000` ; do true ; done'
+	perf script -i "${perfdatafile}" -F +metric  > $scriptoutput
+	test $(grep -c metric $scriptoutput) -gt 5
+	grep metric $scriptoutput | head
+	echo "script metric test [Success]"
+}
+
 test_db
 test_parallel_perf
+test_metric
 
 cleanup
 
-- 
2.45.2

Re: [PATCH 2/2] Add a test case for perf script -F +metric

[Namhyung Kim]

On Mon, Jun 24, 2024 at 05:42:32PM -0700, Andi Kleen wrote:
> Just a simple test
> 
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
> ---
>  tools/perf/tests/shell/script.sh | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/tests/shell/script.sh b/tools/perf/tests/shell/script.sh
> index c1a603653662..cd9d41734021 100755
> --- a/tools/perf/tests/shell/script.sh
> +++ b/tools/perf/tests/shell/script.sh
> @@ -1,4 +1,4 @@
> -#!/bin/sh
> +#!/bin/bash

Do we really need this?


>  # perf script tests
>  # SPDX-License-Identifier: GPL-2.0
>  
> @@ -7,6 +7,7 @@ set -e
>  temp_dir=$(mktemp -d /tmp/perf-test-script.XXXXXXXXXX)
>  
>  perfdatafile="${temp_dir}/perf.data"
> +scriptoutput="${temp_dir}/script"
>  db_test="${temp_dir}/db_test.py"
>  
>  err=0
> @@ -88,8 +89,21 @@ test_parallel_perf()
>  	echo "parallel-perf test [Success]"
>  }
>  
> +test_metric()
> +{
> +	echo "script metric test"
> +	if ! perf list | grep -q cycles ; then return ; fi
> +	if ! perf list | grep -q instructions ; then return ; fi
> +	perf record -e '{cycles,instructions}' -o "${perfdatafile}" bash -c 'for i in `seq 1000` ; do true ; done'

You can use built-in workloads like noploop or so instead of running
an external command.

  $ perf record -- perf test -w noploop

Thanks,
Namhyung


> +	perf script -i "${perfdatafile}" -F +metric  > $scriptoutput
> +	test $(grep -c metric $scriptoutput) -gt 5
> +	grep metric $scriptoutput | head
> +	echo "script metric test [Success]"
> +}
> +
>  test_db
>  test_parallel_perf
> +test_metric
>  
>  cleanup
>  
> -- 
> 2.45.2
> 

Re: [PATCH 1/2] perf script: Fix perf script -F +metric

[Artem Savkov]

On Mon, Jun 24, 2024 at 05:42:31PM -0700, Andi Kleen wrote:
> This fixes a regression with perf script -F +metric originally caused by :
>
> commit 37cc8ad77cf81f3ffd226856c367b0e15333a738
> Author: Ian Rogers <irogers@google.com>
> Date:   Sun Feb 19 01:28:46 2023 -0800
>
>     perf metric: Directly use counts rather than saved_value
>
> In the perf script environment the evsel wouldn't allocate an aggr
> values array, which led to a -1 reference because the metric
> evaluation would try to reference NULL - 1 (for aggr_idx)
>
> Give the perf script evsels a single CPU aggr setup. That's
> enough because the groups are always contiguous, so no need
> to store more than one CPU's worth of values.
>
> Before
>
> % perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
> % perf script -F +metric
> Segmentation fault (core dumped)
>
> After:
>
> % perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
> ...
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.028 MB perf.data (90 samples) ]
> % perf script -F +metric
>        perf-exec 1847557 264658.180789:       3009       cycles:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
>        perf-exec 1847557 264658.180789:        382 instructions:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
>        perf-exec 1847557 264658.180789:         metric:    0.13  insn per cycle
> ...
>
> Fixes: 37cc8ad77cf8 ("perf metric: Directly use counts rather ...")
> Signed-off-by: Andi Kleen <ak@linux.intel.com>

This works, however there seems to be yet another issue on
perf-tools-next branch that breaks script metrics.

617824a7f0f73 (perf parse-events: Prefer sysfs/JSON hardware
events over legacy, 2024-04-15) changes event priority so on
my host "instructions" have type PERF_TYPE_RAW instead of
PERF_TYPE_HARDWARE.

# event : name = instructions, , id = { 190969, 190970, 190971, 190972, 190973, 190974, 190975, 190976 }, type = 4 (cpu), size = 136, config = 0xc0 (instructions), sample_type = IP|TID|TIME|READ|CPU|PERIOD|IDENTIFIER, read_format = ID|GROUP|LOST, sample_id_all = 1, exclude_guest = 1

This results in evsel__stat_type no longer recognizing these as
STAT_INSTRUCTIONS.

> ---
>  tools/perf/builtin-script.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index c16224b1fef3..4aab194b4b1a 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -84,7 +84,7 @@ static bool			system_wide;
>  static bool			print_flags;
>  static const char		*cpu_list;
>  static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
> -static struct perf_stat_config	stat_config;
> +static struct perf_stat_config	stat_config = { .aggr_map = &(struct cpu_aggr_map){ .nr = 1 } };
>  static int			max_blocks;
>  static bool			native_arch;
>  static struct dlfilter		*dlfilter;
> @@ -2133,12 +2133,14 @@ static void perf_sample__fprint_metric(struct perf_script *script,
>  	if (evsel_script(leader)->gnum++ == 0)
>  		perf_stat__reset_shadow_stats();
>  	val = sample->period * evsel->scale;
> +	/* Always use CPU 0 storage because the groups are contiguous. */
> +	evsel->stats->aggr[0].counts.val = val;
>  	evsel_script(evsel)->val = val;
>  	if (evsel_script(leader)->gnum == leader->core.nr_members) {
>  		for_each_group_member (ev2, leader) {
>  			perf_stat__print_shadow_stats(&stat_config, ev2,
>  						      evsel_script(ev2)->val,
> -						      sample->cpu,
> +						      0,
>  						      &ctx,
>  						      NULL);
>  		}
> --
> 2.45.2
>

--
 Artem

Re: [PATCH 1/2] perf script: Fix perf script -F +metric

[Namhyung Kim]

On Wed, Jun 26, 2024 at 11:09:24AM +0200, Artem Savkov wrote:
> On Mon, Jun 24, 2024 at 05:42:31PM -0700, Andi Kleen wrote:
> > This fixes a regression with perf script -F +metric originally caused by :
> >
> > commit 37cc8ad77cf81f3ffd226856c367b0e15333a738
> > Author: Ian Rogers <irogers@google.com>
> > Date:   Sun Feb 19 01:28:46 2023 -0800
> >
> >     perf metric: Directly use counts rather than saved_value
> >
> > In the perf script environment the evsel wouldn't allocate an aggr
> > values array, which led to a -1 reference because the metric
> > evaluation would try to reference NULL - 1 (for aggr_idx)
> >
> > Give the perf script evsels a single CPU aggr setup. That's
> > enough because the groups are always contiguous, so no need
> > to store more than one CPU's worth of values.
> >
> > Before
> >
> > % perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
> > % perf script -F +metric
> > Segmentation fault (core dumped)
> >
> > After:
> >
> > % perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
> > ...
> > [ perf record: Woken up 1 times to write data ]
> > [ perf record: Captured and wrote 0.028 MB perf.data (90 samples) ]
> > % perf script -F +metric
> >        perf-exec 1847557 264658.180789:       3009       cycles:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
> >        perf-exec 1847557 264658.180789:        382 instructions:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
> >        perf-exec 1847557 264658.180789:         metric:    0.13  insn per cycle
> > ...
> >
> > Fixes: 37cc8ad77cf8 ("perf metric: Directly use counts rather ...")
> > Signed-off-by: Andi Kleen <ak@linux.intel.com>
> 
> This works, however there seems to be yet another issue on
> perf-tools-next branch that breaks script metrics.
> 
> 617824a7f0f73 (perf parse-events: Prefer sysfs/JSON hardware
> events over legacy, 2024-04-15) changes event priority so on
> my host "instructions" have type PERF_TYPE_RAW instead of
> PERF_TYPE_HARDWARE.
> 
> # event : name = instructions, , id = { 190969, 190970, 190971, 190972, 190973, 190974, 190975, 190976 }, type = 4 (cpu), size = 136, config = 0xc0 (instructions), sample_type = IP|TID|TIME|READ|CPU|PERIOD|IDENTIFIER, read_format = ID|GROUP|LOST, sample_id_all = 1, exclude_guest = 1
> 
> This results in evsel__stat_type no longer recognizing these as
> STAT_INSTRUCTIONS.

Hmm.. sounds like a problem.  Ian, did you notice this?

Thanks,
Namhyung

> 
> > ---
> >  tools/perf/builtin-script.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> > index c16224b1fef3..4aab194b4b1a 100644
> > --- a/tools/perf/builtin-script.c
> > +++ b/tools/perf/builtin-script.c
> > @@ -84,7 +84,7 @@ static bool			system_wide;
> >  static bool			print_flags;
> >  static const char		*cpu_list;
> >  static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
> > -static struct perf_stat_config	stat_config;
> > +static struct perf_stat_config	stat_config = { .aggr_map = &(struct cpu_aggr_map){ .nr = 1 } };
> >  static int			max_blocks;
> >  static bool			native_arch;
> >  static struct dlfilter		*dlfilter;
> > @@ -2133,12 +2133,14 @@ static void perf_sample__fprint_metric(struct perf_script *script,
> >  	if (evsel_script(leader)->gnum++ == 0)
> >  		perf_stat__reset_shadow_stats();
> >  	val = sample->period * evsel->scale;
> > +	/* Always use CPU 0 storage because the groups are contiguous. */
> > +	evsel->stats->aggr[0].counts.val = val;
> >  	evsel_script(evsel)->val = val;
> >  	if (evsel_script(leader)->gnum == leader->core.nr_members) {
> >  		for_each_group_member (ev2, leader) {
> >  			perf_stat__print_shadow_stats(&stat_config, ev2,
> >  						      evsel_script(ev2)->val,
> > -						      sample->cpu,
> > +						      0,
> >  						      &ctx,
> >  						      NULL);
> >  		}
> > --
> > 2.45.2
> >
> 
> --
>  Artem
> 

Re: [PATCH 1/2] perf script: Fix perf script -F +metric

[Andi Kleen]

> This works, however there seems to be yet another issue on
> perf-tools-next branch that breaks script metrics.
> 
> 617824a7f0f73 (perf parse-events: Prefer sysfs/JSON hardware
> events over legacy, 2024-04-15) changes event priority so on
> my host "instructions" have type PERF_TYPE_RAW instead of
> PERF_TYPE_HARDWARE.

FWIW I don't see this on my build on Intel, even with that commit.

> This results in evsel__stat_type no longer recognizing these as
> STAT_INSTRUCTIONS.

I guess we could just fix evsel__stat_type to handle that case

Does this patch work?

perf: Workaround event priority problems
    
When instructions is not of HARDWARE types anymore, but raw,
which breaks the shadow stat metrics detection for IPC.
    
Reported-by: Artem Savkov <asavkov@redhat.com>
Fixes: 617824a7f0f73 (perf parse-events: Prefer sysfs/JSON hardware
Signed-off-by: Andi Kleen <ak@linux.intel.com>

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 3466aa952442..87a503e47ff0 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -97,9 +97,11 @@ static enum stat_type evsel__stat_type(const struct evsel *evsel)
 
 	if (evsel__is_clock(evsel))
 		return STAT_NSECS;
-	else if (evsel__match(evsel, HARDWARE, HW_CPU_CYCLES))
+	else if (evsel__match(evsel, HARDWARE, HW_CPU_CYCLES) ||
+			!strcmp(evsel__name((struct evsel *)evsel), "cycles"))
 		return STAT_CYCLES;
-	else if (evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS))
+	else if (evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS) ||
+			!strcmp(evsel__name((struct evsel *)evsel), "instructions"))
 		return STAT_INSTRUCTIONS;
 	else if (evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
 		return STAT_STALLED_CYCLES_FRONT;

Re: [PATCH 1/2] perf script: Fix perf script -F +metric

[Artem Savkov]

On Fri, Jun 28, 2024 at 12:19:59PM -0700, Andi Kleen wrote:
> > This works, however there seems to be yet another issue on
> > perf-tools-next branch that breaks script metrics.
> >
> > 617824a7f0f73 (perf parse-events: Prefer sysfs/JSON hardware
> > events over legacy, 2024-04-15) changes event priority so on
> > my host "instructions" have type PERF_TYPE_RAW instead of
> > PERF_TYPE_HARDWARE.
>
> FWIW I don't see this on my build on Intel, even with that commit.
>
> > This results in evsel__stat_type no longer recognizing these as
> > STAT_INSTRUCTIONS.
>
> I guess we could just fix evsel__stat_type to handle that case
>
> Does this patch work?

It does for this specific example, but there are other events as well.
From arch/x86/events/intel/core.c:

        static u64 intel_perfmon_event_map[PERF_COUNT_HW_MAX] __read_mostly =
        {
                [PERF_COUNT_HW_CPU_CYCLES]		= 0x003c,
                [PERF_COUNT_HW_INSTRUCTIONS]		= 0x00c0,
                [PERF_COUNT_HW_CACHE_REFERENCES]	= 0x4f2e,
                [PERF_COUNT_HW_CACHE_MISSES]		= 0x412e,
                [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]	= 0x00c4,
                [PERF_COUNT_HW_BRANCH_MISSES]		= 0x00c5,
                [PERF_COUNT_HW_BUS_CYCLES]		= 0x013c,
                [PERF_COUNT_HW_REF_CPU_CYCLES]		= 0x0300, /* pseudo-encoding */
        };

The list is probably different on other arches.

> perf: Workaround event priority problems
>
> When instructions is not of HARDWARE types anymore, but raw,
> which breaks the shadow stat metrics detection for IPC.
>
> Reported-by: Artem Savkov <asavkov@redhat.com>
> Fixes: 617824a7f0f73 (perf parse-events: Prefer sysfs/JSON hardware
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
>
> diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
> index 3466aa952442..87a503e47ff0 100644
> --- a/tools/perf/util/stat-shadow.c
> +++ b/tools/perf/util/stat-shadow.c
> @@ -97,9 +97,11 @@ static enum stat_type evsel__stat_type(const struct evsel *evsel)
>
>  	if (evsel__is_clock(evsel))
>  		return STAT_NSECS;
> -	else if (evsel__match(evsel, HARDWARE, HW_CPU_CYCLES))
> +	else if (evsel__match(evsel, HARDWARE, HW_CPU_CYCLES) ||
> +			!strcmp(evsel__name((struct evsel *)evsel), "cycles"))

It is also probably worth to add a PERF_TYPE_RAW check.

>  		return STAT_CYCLES;
> -	else if (evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS))
> +	else if (evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS) ||
> +			!strcmp(evsel__name((struct evsel *)evsel), "instructions"))
>  		return STAT_INSTRUCTIONS;
>  	else if (evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
>  		return STAT_STALLED_CYCLES_FRONT;
>

--
 Artem

Re: [PATCH 1/2] perf script: Fix perf script -F +metric

[Andi Kleen]

On Mon, Jul 01, 2024 at 09:04:38AM +0200, Artem Savkov wrote:
> On Fri, Jun 28, 2024 at 12:19:59PM -0700, Andi Kleen wrote:
> > > This works, however there seems to be yet another issue on
> > > perf-tools-next branch that breaks script metrics.
> > >
> > > 617824a7f0f73 (perf parse-events: Prefer sysfs/JSON hardware
> > > events over legacy, 2024-04-15) changes event priority so on
> > > my host "instructions" have type PERF_TYPE_RAW instead of
> > > PERF_TYPE_HARDWARE.
> >
> > FWIW I don't see this on my build on Intel, even with that commit.
> >
> > > This results in evsel__stat_type no longer recognizing these as
> > > STAT_INSTRUCTIONS.
> >
> > I guess we could just fix evsel__stat_type to handle that case
> >
> > Does this patch work?
> 
> It does for this specific example, but there are other events as well.
> From arch/x86/events/intel/core.c:
> 
>         static u64 intel_perfmon_event_map[PERF_COUNT_HW_MAX] __read_mostly =
>         {
>                 [PERF_COUNT_HW_CPU_CYCLES]		= 0x003c,
>                 [PERF_COUNT_HW_INSTRUCTIONS]		= 0x00c0,
>                 [PERF_COUNT_HW_CACHE_REFERENCES]	= 0x4f2e,
>                 [PERF_COUNT_HW_CACHE_MISSES]		= 0x412e,
>                 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]	= 0x00c4,
>                 [PERF_COUNT_HW_BRANCH_MISSES]		= 0x00c5,
>                 [PERF_COUNT_HW_BUS_CYCLES]		= 0x013c,
>                 [PERF_COUNT_HW_REF_CPU_CYCLES]		= 0x0300, /* pseudo-encoding */
>         };
> 
> The list is probably different on other arches.

Most of them only use the fallback "xxx per second" metric, which
should work even for raw I think. But yes some would be needed
(like cache and branches) 

Probably it needs a more generic solution then, it was somewhat
of a hack anyways.

My proposal would be to revert the original patch. Clearly
it was a bad idea.

-Andi
 

Re: [PATCH 1/2] perf script: Fix perf script -F +metric

[Namhyung Kim]

Hi Andi,

On Mon, Jun 24, 2024 at 05:42:31PM -0700, Andi Kleen wrote:
> This fixes a regression with perf script -F +metric originally caused by :
> 
> commit 37cc8ad77cf81f3ffd226856c367b0e15333a738
> Author: Ian Rogers <irogers@google.com>
> Date:   Sun Feb 19 01:28:46 2023 -0800
> 
>     perf metric: Directly use counts rather than saved_value
> 
> In the perf script environment the evsel wouldn't allocate an aggr
> values array, which led to a -1 reference because the metric
> evaluation would try to reference NULL - 1 (for aggr_idx)
> 
> Give the perf script evsels a single CPU aggr setup. That's
> enough because the groups are always contiguous, so no need
> to store more than one CPU's worth of values.
> 
> Before
> 
> % perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
> % perf script -F +metric
> Segmentation fault (core dumped)
> 
> After:
> 
> % perf record -e '{cycles,instructions}:S' perf bench  mem memcpy
> ...
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.028 MB perf.data (90 samples) ]
> % perf script -F +metric
>        perf-exec 1847557 264658.180789:       3009       cycles:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
>        perf-exec 1847557 264658.180789:        382 instructions:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
>        perf-exec 1847557 264658.180789:         metric:    0.13  insn per cycle
> ...

Thanks for the fix!

> 
> Fixes: 37cc8ad77cf8 ("perf metric: Directly use counts rather ...")
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
> ---
>  tools/perf/builtin-script.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index c16224b1fef3..4aab194b4b1a 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -84,7 +84,7 @@ static bool			system_wide;
>  static bool			print_flags;
>  static const char		*cpu_list;
>  static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
> -static struct perf_stat_config	stat_config;
> +static struct perf_stat_config	stat_config = { .aggr_map = &(struct cpu_aggr_map){ .nr = 1 } };

Can you please follow the coding style and properly put the code?

Thanks,
Namhyung


>  static int			max_blocks;
>  static bool			native_arch;
>  static struct dlfilter		*dlfilter;
> @@ -2133,12 +2133,14 @@ static void perf_sample__fprint_metric(struct perf_script *script,
>  	if (evsel_script(leader)->gnum++ == 0)
>  		perf_stat__reset_shadow_stats();
>  	val = sample->period * evsel->scale;
> +	/* Always use CPU 0 storage because the groups are contiguous. */
> +	evsel->stats->aggr[0].counts.val = val;
>  	evsel_script(evsel)->val = val;
>  	if (evsel_script(leader)->gnum == leader->core.nr_members) {
>  		for_each_group_member (ev2, leader) {
>  			perf_stat__print_shadow_stats(&stat_config, ev2,
>  						      evsel_script(ev2)->val,
> -						      sample->cpu,
> +						      0,
>  						      &ctx,
>  						      NULL);
>  		}
> -- 
> 2.45.2
>