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

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Date:   Mon, 17 Apr 2017 01:34:52 -0700
From:   tip-bot for Ravi Bangoria <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     ravi.bangoria@...ux.vnet.ibm.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, alexis.berlemont@...il.com,
        acme@...hat.com, tglx@...utronix.de, peterz@...radead.org,
        alexander.shishkin@...ux.intel.com, hpa@...or.com
Subject: [tip:perf/core] perf trace: Add usage of --no-syscalls in man page

Commit-ID:  739cf305512cb852e852099f9e12dd66bf4df076
Gitweb:     http://git.kernel.org/tip/739cf305512cb852e852099f9e12dd66bf4df076
Author:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
AuthorDate: Thu, 13 Apr 2017 11:32:12 +0530
Committer:  Arnaldo Carvalho de Melo <acme@...hat.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@...ux.vnet.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Alexis Berlemont <alexis.berlemont@...il.com>
Cc: Peter Zijlstra <peterz@...radead.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@...hat.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.