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As reported by Milian, currently for DWARF unwind (both libdw and
libunwind) we display callchain in callee order only.
Adding the support to follow callchain order setup to libdw DWARF
unwinder, so we could get following output for report:
$ perf record --call-graph dwarf ls
...
$ perf report --no-children --stdio
21.12% ls libc-2.21.so [.] __strcoll_l
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---__strcoll_l
mpsort_with_tmp
mpsort_with_tmp
mpsort_with_tmp
sort_files
main
__libc_start_main
_start
$ perf report --stdio --no-children -g caller
21.12% ls libc-2.21.so [.] __strcoll_l
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---_start
__libc_start_main
main
sort_files
mpsort_with_tmp
mpsort_with_tmp
mpsort_with_tmp
__strcoll_l
Reported-and-Tested-by: Milian Wolff <milian.wolff@kdab.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Wang Nan <wangnan0@huawei.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jan Kratochvil <jkratoch@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20151119130119.GA26617@krava.brq.redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
24 lines
501 B
C
24 lines
501 B
C
#ifndef __PERF_UNWIND_LIBDW_H
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#define __PERF_UNWIND_LIBDW_H
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#include <elfutils/libdwfl.h>
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#include "event.h"
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#include "thread.h"
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#include "unwind.h"
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bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg);
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struct unwind_info {
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Dwfl *dwfl;
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struct perf_sample *sample;
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struct machine *machine;
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struct thread *thread;
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unwind_entry_cb_t cb;
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void *arg;
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int max_stack;
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int idx;
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struct unwind_entry entries[];
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};
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#endif /* __PERF_UNWIND_LIBDW_H */
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