From 739cf305512cb852e852099f9e12dd66bf4df076 Mon Sep 17 00:00:00 2001 From: Ravi Bangoria Date: Thu, 13 Apr 2017 11:32:12 +0530 Subject: [PATCH] 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 Cc: Alexander Shishkin Cc: Alexis Berlemont Cc: Peter Zijlstra 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 --- 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 afd728672b6f..c1e3288a2dfb 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. -- 2.20.1