[PATCH] perf trace: Add usage of --no-syscalls in man page

[PATCH] perf trace: Add usage of --no-syscalls in man page

[Ravi Bangoria]

perf trace supports --no-syscalls option but it's not listed in
the man page. (Though, I see an example using --no-syscalls in
EXAMPLES section.)

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
---
 tools/perf/Documentation/perf-trace.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index afd7286..c1e3288 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -123,7 +123,8 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
 	major or all pagefaults. Default value is maj.
 
 --syscalls::
-	Trace system calls. This options is enabled by default.
+	Trace system calls. This options is enabled by default, disable with
+	--no-syscalls.
 
 --call-graph [mode,type,min[,limit],order[,key][,branch]]::
         Setup and enable call-graph (stack chain/backtrace) recording.
-- 
2.1.4

Re: [PATCH] perf trace: Add usage of --no-syscalls in man page

[Arnaldo Carvalho de Melo]

Em Thu, Apr 13, 2017 at 11:32:12AM +0530, Ravi Bangoria escreveu:
> perf trace supports --no-syscalls option but it's not listed in
> the man page. (Though, I see an example using --no-syscalls in
> EXAMPLES section.)

Thanks, applied.

I'm thinking about making --no-syscalls the default when 'trace' is
hardlinked to 'perf', i.e. 'perf trace'  remains as it is, but if one
calls 'trace', then --no-syscalls is the default, as after non-syscall
events got supported I find myself using --no-syscalls way too often,
what do you think?

Or perhaps have a 'perf strace' to try to have as much in common with
'strace' in terms of default behaviour, options, etc?

- Arnaldo
 
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
> ---
>  tools/perf/Documentation/perf-trace.txt | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
> index afd7286..c1e3288 100644
> --- a/tools/perf/Documentation/perf-trace.txt
> +++ b/tools/perf/Documentation/perf-trace.txt
> @@ -123,7 +123,8 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
>  	major or all pagefaults. Default value is maj.
>  
>  --syscalls::
> -	Trace system calls. This options is enabled by default.
> +	Trace system calls. This options is enabled by default, disable with
> +	--no-syscalls.
>  
>  --call-graph [mode,type,min[,limit],order[,key][,branch]]::
>          Setup and enable call-graph (stack chain/backtrace) recording.
> -- 
> 2.1.4

Re: [PATCH] perf trace: Add usage of --no-syscalls in man page

[Ravi Bangoria]

Hi Arnaldo, Thanks for pulling the patch.

On Thursday 13 April 2017 07:21 PM, Arnaldo Carvalho de Melo wrote:
> Em Thu, Apr 13, 2017 at 11:32:12AM +0530, Ravi Bangoria escreveu:
>> perf trace supports --no-syscalls option but it's not listed in
>> the man page. (Though, I see an example using --no-syscalls in
>> EXAMPLES section.)
> Thanks, applied.
>
> I'm thinking about making --no-syscalls the default when 'trace' is
> hardlinked to 'perf', i.e. 'perf trace'  remains as it is, but if one
> calls 'trace', then --no-syscalls is the default, as after non-syscall
> events got supported I find myself using --no-syscalls way too often,
> what do you think?

+1. Makes sense to me.

I also use 'perf trace' more often for non-syscall events.
So.. if others are okay please do it.

-Ravi

[tip:perf/core] perf trace: Add usage of --no-syscalls in man page

[tip-bot for Ravi Bangoria]

Commit-ID:  739cf305512cb852e852099f9e12dd66bf4df076
Gitweb:     http://git.kernel.org/tip/739cf305512cb852e852099f9e12dd66bf4df076
Author:     Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
AuthorDate: Thu, 13 Apr 2017 11:32:12 +0530
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 13 Apr 2017 10:54:04 -0300

perf trace: Add usage of --no-syscalls in man page

perf trace supports --no-syscalls option but it's not listed in the man
page. (Though, I see an example using --no-syscalls in EXAMPLES
section.)

Committer note:

The --no-syscalls option tells 'perf trace' not to automagically ask for
raw_syscalls:sys_{enter,exit} to then format it in a strace like way.

This become more used as 'perf trace' got support for arbitrary events,
such as tracepoints, so more and more we use:

  # perf trace --no-syscalls -e nmi:*
     0.000 nmi:nmi_handler:perf_event_nmi_handler() delta_ns: 36649 handled: 1)
     0.019 nmi:nmi_handler:nmi_cpu_backtrace_handler() delta_ns: 2907 handled: 0)
     0.676 nmi:nmi_handler:perf_event_nmi_handler() delta_ns: 9401 handled: 1)
     0.680 nmi:nmi_handler:nmi_cpu_backtrace_handler() delta_ns: 288 handled: 0)
     0.701 nmi:nmi_handler:perf_event_nmi_handler() delta_ns: 4977 handled: 1)
     0.703 nmi:nmi_handler:nmi_cpu_backtrace_handler() delta_ns: 67 handled: 0)
     0.736 nmi:nmi_handler:perf_event_nmi_handler() delta_ns: 8549 handled: 1)
  ^C#

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexis Berlemont <alexis.berlemont@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1492063332-5745-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/Documentation/perf-trace.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index afd7286..c1e3288 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -123,7 +123,8 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
 	major or all pagefaults. Default value is maj.
 
 --syscalls::
-	Trace system calls. This options is enabled by default.
+	Trace system calls. This options is enabled by default, disable with
+	--no-syscalls.
 
 --call-graph [mode,type,min[,limit],order[,key][,branch]]::
         Setup and enable call-graph (stack chain/backtrace) recording.