A shortcut to select generalized hw events

A shortcut to select generalized hw events

[Francis Moreau]

Hello,

Is there a mean to select all counters of a certain type ?

For example I'd like to select all generalized hw counter with
perf-stat, is this possible ?

Thanks
-- 
Francis

Re: A shortcut to select generalized hw events

[Pádraig Brady]

On 27/05/11 13:01, Francis Moreau wrote:
> Hello,
> 
> Is there a mean to select all counters of a certain type ?
> 
> For example I'd like to select all generalized hw counter with
> perf-stat, is this possible ?

I was looking for that too.
I didn't look too hard, but there was nothing obvious.
It would be very useful for example, to print all hardware counters
that are supported by the current system as you say.
To do that, I'm using this perf-hw script:

#!/bin/sh
hw_events=$(
 for i in $(perf list | sed -n 's/\[Hardware.*event\]//; T; s/ OR .*//; p'); do
    perf stat -e $i true >/dev/null 2>&1 &&
     printf -- "-e %s \n" $i
 done | tr -d '\n'
)
perf stat $hw_events $*

cheers,
Pádraig.

Re: A shortcut to select generalized hw events

[Pádraig Brady]

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On 27/05/11 14:46, Pádraig Brady wrote:
> On 27/05/11 13:01, Francis Moreau wrote:
>> Hello,
>>
>> Is there a mean to select all counters of a certain type ?
>>
>> For example I'd like to select all generalized hw counter with
>> perf-stat, is this possible ?
> 
> I was looking for that too.
> I didn't look too hard, but there was nothing obvious.
> It would be very useful for example, to print all hardware counters
> that are supported by the current system as you say.
> To do that, I'm using this perf-hw script:
> 
> #!/bin/sh
> hw_events=$(
>  for i in $(perf list | sed -n 's/\[Hardware.*event\]//; T; s/ OR .*//; p'); do
>     perf stat -e $i true >/dev/null 2>&1 &&
>      printf -- "-e %s \n" $i
>  done | tr -d '\n'
> )
> perf stat $hw_events $*

I've also just noticed the -ddd option recently added with:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=2cba3ffb

I've attached some more documentation which might be useful?

cheers,
Pádraig.

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From 50273f3c531b2111343326a22dd76a9c1d893338 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
Date: Tue, 31 May 2011 16:16:59 +0100
Subject: [PATCH] perf stat: better document the -d option
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Document fully the -d option from commit 2cba3ffb
* Documentation/perf-stat.txt: Detail the -d option
* builtin-stat.c: Document that -d can be repeated

Signed-off-by: Pádraig Brady <P@draigBrady.com>
---
 tools/perf/Documentation/perf-stat.txt |    6 ++++++
 tools/perf/builtin-stat.c              |    2 +-
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 918cc38..36a6a00 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -50,6 +50,12 @@ OPTIONS
 --scale::
 	scale/normalize counter values
 
+-d::
+        print more detailed statistics - repeat for more
+            -d:           detailed events, L1 and LLC data cache
+            -dd:     more detailed events, dTLB and iTLB events
+            -ddd:    very detailed events, adding prefetch events
+
 -r::
 --repeat=<n>::
 	repeat command and print average + stddev (max: 100)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index a9f0671..a99be46 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1044,7 +1044,7 @@ static const struct option options[] = {
 	OPT_BOOLEAN('n', "null", &null_run,
 		    "null run - dont start any counters"),
 	OPT_INCR('d', "detailed", &detailed_run,
-		    "detailed run - start a lot of events"),
+		    "detailed run - start a lot of events - repeat for more"),
 	OPT_BOOLEAN('S', "sync", &sync_run,
 		    "call sync() before starting a run"),
 	OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL, 
-- 
1.7.5.1

Re: A shortcut to select generalized hw events

[Francis Moreau]

Hello,

2011/5/31 Pádraig Brady <P@draigbrady.com>:
> On 27/05/11 14:46, Pádraig Brady wrote:
>> On 27/05/11 13:01, Francis Moreau wrote:
>>> Hello,
>>>
>>> Is there a mean to select all counters of a certain type ?
>>>
>>> For example I'd like to select all generalized hw counter with
>>> perf-stat, is this possible ?
>>
>> I was looking for that too.
>> I didn't look too hard, but there was nothing obvious.
>> It would be very useful for example, to print all hardware counters
>> that are supported by the current system as you say.
>> To do that, I'm using this perf-hw script:
>>
>> #!/bin/sh
>> hw_events=$(
>>  for i in $(perf list | sed -n 's/\[Hardware.*event\]//; T; s/ OR .*//; p'); do
>>     perf stat -e $i true >/dev/null 2>&1 &&
>>      printf -- "-e %s \n" $i
>>  done | tr -d '\n'
>> )
>> perf stat $hw_events $*
>
> I've also just noticed the -ddd option recently added with:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=2cba3ffb
>
> I've attached some more documentation which might be useful?

Probably more useful is to update the man pages too with a '-d -d -d'
verbosity :)

BTW, can't this new option be part to perf-record too ?

Thanks
-- 
Francis