diff options
| author | Tony Jones <tonyj@suse.de> | 2020-03-25 09:40:53 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-03-25 16:13:21 -0300 |
| commit | eadcaa3dfd706bbf46682c8b8b5979262443c3c3 (patch) | |
| tree | a2e0f4f6d2f875492d1a458bfa6413397814e350 /tools/perf/Documentation/perf-config.txt | |
| parent | 0d33b34352531ff7029c58eda2321340c0ea3f5f (diff) | |
perf callchain: Update docs regarding kernel/user space unwinding
The method of unwinding for kernel space is defined by the kernel
config, not by the value of --call-graph. Improve the documentation to
reflect this.
Signed-off-by: Tony Jones <tonyj@suse.de>
Link: http://lore.kernel.org/lkml/20200325164053.10177-1-tonyj@suse.de
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-config.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-config.txt | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt index 8ead55593984..f16d8a71d3f5 100644 --- a/tools/perf/Documentation/perf-config.txt +++ b/tools/perf/Documentation/perf-config.txt @@ -405,14 +405,16 @@ ui.*:: This option is only applied to TUI. call-graph.*:: - When sub-commands 'top' and 'report' work with -g/—-children - there're options in control of call-graph. + The following controls the handling of call-graphs (obtained via the + -g/--call-graph options). call-graph.record-mode:: - The record-mode can be 'fp' (frame pointer), 'dwarf' and 'lbr'. - The value of 'dwarf' is effective only if perf detect needed library - (libunwind or a recent version of libdw). - 'lbr' only work for cpus that support it. + The mode for user space can be 'fp' (frame pointer), 'dwarf' + and 'lbr'. The value 'dwarf' is effective only if libunwind + (or a recent version of libdw) is present on the system; + the value 'lbr' only works for certain cpus. The method for + kernel space is controlled not by this option but by the + kernel config (CONFIG_UNWINDER_*). call-graph.dump-size:: The size of stack to dump in order to do post-unwinding. Default is 8192 (byte). |