| From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 51/54] perf report: Provide libtraceevent with a kernel symbol resolver | Date | Thu, 8 Mar 2018 16:50:26 -0300 |
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From: Wang YanQing <udknight@gmail.com>
So that beautifiers wanting to resolve kernel function addresses to names can do its work, and when we use "perf report" for output of "perf kmem record", we will get kernel symbol output.
This patch affect the output of "perf report" for the record data generated by "perf kmem record" looks like below:
Before patch: 0.01% call_site=ffffffff814e5828 ptr=0x99bb000 bytes_req=3616 bytes_alloc=4096 gfp_flags=GFP_ATOMIC 0.01% call_site=ffffffff81370b87 ptr=0x428a3060 bytes_req=32 bytes_alloc=32 gfp_flags=GFP_KERNEL|GFP_ZERO
After patch: 0.01% (aa_alloc_task_context+0x27) call_site=ffffffff81370b87 ptr=0x428a3060 bytes_req=32 bytes_alloc=32 gfp_flags=GFP_KERNEL|GFP_ZERO 0.01% (__tty_buffer_request_room+0x88) call_site=ffffffff814e5828 ptr=0x99bb000 bytes_req=3616 bytes_alloc=4096 gfp_flags=GFP_ATOMIC
Signed-off-by: Wang YanQing <udknight@gmail.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180308032850.GA12383@udknight-ThinkPad-E550 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/builtin-report.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index c3603d4c0c57..971ccba85464 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -1348,6 +1348,15 @@ int cmd_report(int argc, const char **argv) report.range_num = 1; } + if (session->tevent.pevent && + pevent_set_function_resolver(session->tevent.pevent, + machine__resolve_kernel_addr, + &session->machines.host) < 0) { + pr_err("%s: failed to set libtraceevent function resolver\n", + __func__); + return -1; + } + sort__setup_elide(stdout); ret = __cmd_report(&report); -- 2.14.3
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