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Date: Fri, 3 Jul 2020 15:30:32 +0900 From: Namhyung Kim <namhyung@...nel.org> To: Changbin Du <changbin.du@...il.com> Cc: Jiri Olsa <jolsa@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v2 09/15] perf ftrace: add support for tracing option 'func_stack_trace' On Sat, Jun 27, 2020 at 10:38 PM Changbin Du <changbin.du@...il.com> wrote: > > This adds support to display call trace for function tracer. To do this, > just specify a '--func-call-graph' option. What if it's used with -G option? Also it might be used only with the -T option.. How about showing a warning if it's missing.. ? Thanks Namhyung > > $ sudo perf ftrace -T vfs_read --func-call-graph > iio-sensor-prox-855 [003] 6168.369657: vfs_read <-ksys_read > iio-sensor-prox-855 [003] 6168.369677: <stack trace> > => vfs_read > => ksys_read > => __x64_sys_read > => do_syscall_64 > => entry_SYSCALL_64_after_hwframe > ... > > Signed-off-by: Changbin Du <changbin.du@...il.com>
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