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Date: Thu, 16 Mar 2023 14:26:18 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Artem Savkov <asavkov@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
Milian Wolff <milian.wolff@...b.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH 0/1] perf report: append inlines to non-dwarf callchains
Hello,
On Thu, Mar 16, 2023 at 6:36 AM Artem Savkov <asavkov@...hat.com> wrote:
>
> In an email to Arnaldo Andrii Nakryiko suggested that perf can get
> information about inlined functions from dwarf when available and then
> add it to userspace stacktraces even in framepointer or lbr mode.
> Looking closer at perf it turned out all required bits and pieces are
> already there and inline information can be easily added to both
> framepointer and lbr callchains by adding an append_inlines() call to
> add_callchain_ip().
Looks great! Have you checked it with perf report -g callee ?
I'm not sure the ordering of inlined functions is maintained
properly. Maybe you can use --no-children too to simplify
the output.
Thanks,
Namhyung
>
> I used the following small program for testing:
>
> ======
> #include <stdio.h>
> #include <stdint.h>
>
> static __attribute__((noinline)) uint32_t func_noinline2(uint32_t i)
> {
> return i + 10;
> }
>
> static inline uint32_t func_declared_inlined(uint32_t i)
> {
> return func_noinline2(i + 4);
> }
>
> static __attribute__((noinline)) uint32_t func_noinline(uint32_t i)
> {
> return func_declared_inlined(i + 3);
> }
>
> static uint32_t func_inlined(uint32_t i)
> {
> return func_noinline(i + 2);
> }
>
> int main(int argc, char **argv)
> {
> uint64_t ret = 0;
> uint32_t i = 0;
>
> for (i = 0; i < 10000000; i++) {
> ret += func_inlined(i);
> ret -= func_noinline(i);
> ret -= func_noinline2(i);
> ret += func_declared_inlined(i);
> }
>
> printf("%s: %ld\n", __func__, ret);
> return ret;
> }
> ======
>
> When built with "gcc -Wall -fno-omit-frame-pointer -O2 -g" (gcc
> version 12.2.1 20221121 (Red Hat 12.2.1-4) (GCC)) it results in
> func_inlined() and func_declared_inlined() being inlined into main()
> and func_declared_inlined() also being inlined into func_noinline().
>
> Here are the diffs for 'perf report --call-graph --stdio' output before
> and after the patch:
>
> Frame-pointer mode recorded with 'perf record --call-graph=fp --freq=max -- ./a.out'
> ======
> --- unpatched.fp 2023-03-16 13:27:22.724017900 +0100
> +++ patched.fp 2023-03-16 13:27:28.608857921 +0100
> @@ -14,18 +14,24 @@
> ---__libc_start_call_main
> |
> |--46.31%--main
> + | |
> + | --11.16%--func_declared_inlined (inlined)
> |
> |--27.41%--func_noinline
> + | func_declared_inlined (inlined)
> |
> --25.68%--func_noinline2
>
> 85.71% 39.64% a.out a.out [.] main
> |
> |--46.07%--main
> + | |
> + | --11.16%--func_declared_inlined (inlined)
> |
> --39.64%--__libc_start_call_main
> |
> |--27.17%--func_noinline
> + | func_declared_inlined (inlined)
> |
> --12.23%--func_noinline2
>
> @@ -34,31 +40,47 @@
> |--46.31%--__libc_start_call_main
> | |
> | --46.07%--main
> + | |
> + | --11.16%--func_declared_inlined (inlined)
> |
> --25.44%--func_noinline2
>
> 40.56% 13.39% a.out a.out [.] func_noinline
> |
> |--27.17%--func_noinline
> + | func_declared_inlined (inlined)
> |
> --13.39%--__libc_start_call_main
> |
> --13.15%--func_noinline2
>
> + 27.41% 0.00% a.out a.out [.] func_declared_inlined (inlined)
> + |
> + ---func_declared_inlined (inlined)
> +
> + 11.16% 0.00% a.out a.out [.] func_declared_inlined (inlined)
> + |
> + ---func_declared_inlined (inlined)
> +
> 0.30% 0.30% a.out [unknown] [k] 0xffffffff81e011b7
> 0.27% 0.00% a.out ld-linux-x86-64.so.2 [.] _dl_start_user
> 0.25% 0.00% a.out ld-linux-x86-64.so.2 [.] _dl_sysdep_start
> 0.20% 0.00% a.out ld-linux-x86-64.so.2 [.] dl_main
> 0.19% 0.19% a.out [unknown] [k] 0xffffffff81e00193
> + 0.18% 0.00% a.out a.out [.] func_inlined (inlined)
> 0.10% 0.05% a.out ld-linux-x86-64.so.2 [.] _dl_relocate_object
> 0.09% 0.00% a.out [unknown] [k] 0x00007fef811be880
> 0.09% 0.00% a.out ld-linux-x86-64.so.2 [.] _dl_map_object
> 0.06% 0.00% a.out libc.so.6 [.] sysmalloc
> 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] munmap
> - 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] mprotect
> + 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] rtld_timer_accum (inlined)
> + 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] rtld_timer_stop (inlined)
> + 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] __mprotect (inlined)
> 0.05% 0.00% a.out libc.so.6 [.] __x86_cacheinfo_ifunc
> + 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] elf_dynamic_do_Rela (inlined)
> 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] _dl_map_object_from_fd
> - 0.04% 0.00% a.out ld-linux-x86-64.so.2 [.] mmap64
> + 0.05% 0.00% a.out ld-linux-x86-64.so.2 [.] elf_get_dynamic_info (inlined)
> + 0.04% 0.00% a.out ld-linux-x86-64.so.2 [.] __mmap64 (inlined)
> 0.04% 0.04% a.out ld-linux-x86-64.so.2 [.] _dl_cache_libcmp
> 0.04% 0.00% a.out [unknown] [.] 0x000000000001b19a
> 0.04% 0.00% a.out [unknown] [k] 0000000000000000
> @@ -66,13 +88,15 @@
> 0.04% 0.04% a.out ld-linux-x86-64.so.2 [.] do_lookup_x
> 0.03% 0.03% a.out ld-linux-x86-64.so.2 [.] intel_check_word.constprop.0
> 0.03% 0.00% a.out [unknown] [.] 0x0000000004000000
> + 0.03% 0.00% a.out ld-linux-x86-64.so.2 [.] intel_check_word (inlined)
> 0.02% 0.00% a.out ld-linux-x86-64.so.2 [.] _dl_start
> 0.02% 0.02% a.out ld-linux-x86-64.so.2 [.] __GI___tunables_init
> 0.02% 0.00% a.out [unknown] [.] 0x722f3d4b434f535f
> 0.02% 0.00% a.out [unknown] [.] 0x00007ffebdd69f59
> + 0.02% 0.00% a.out ld-linux-x86-64.so.2 [.] tunable_is_name (inlined)
> 0.01% 0.00% a.out ld-linux-x86-64.so.2 [.] _start
> ======
>
> LBR mode recorded with 'perf record --call-graph=lbr -- ./a.out'
> ======
> --- unpatched.lbr 2023-03-16 13:27:50.853253211 +0100
> +++ patched.lbr 2023-03-16 13:27:56.312104813 +0100
> @@ -6,58 +6,95 @@
> # Samples: 238 of event 'cycles:u'
> # Event count (approx.): 193485873
> #
> -# Children Self Command Shared Object Symbol
> -# ........ ........ ....... .................... .................................
> +# Children Self Command Shared Object Symbol
> +# ........ ........ ....... .................... .............................
> #
> 99.11% 36.87% a.out a.out [.] main
> |
> |--62.24%--main
> | |
> - | --17.47%--func_noinline
> + | |--11.05%--func_inlined (inlined)
> + | | func_noinline
> + | | func_declared_inlined (inlined)
> + | |
> + | --6.42%--func_noinline
> + | func_declared_inlined (inlined)
> |
> --36.87%--_start
> - __libc_start_main@@GLIBC_2.34
> + __libc_start_main_alias_2 (inlined)
> __libc_start_call_main
> main
> |
> - |--24.52%--func_noinline
> + |--17.51%--func_inlined (inlined)
> + | func_noinline
> + | func_declared_inlined (inlined)
> + |
> + |--8.45%--func_noinline2
> |
> - --10.01%--func_noinline2
> + |--7.01%--func_noinline
> + | func_declared_inlined (inlined)
> + |
> + --1.57%--func_declared_inlined (inlined)
> + func_noinline2
>
> 99.11% 0.00% a.out a.out [.] _start
> |
> ---_start
> - __libc_start_main@@GLIBC_2.34
> + __libc_start_main_alias_2 (inlined)
> __libc_start_call_main
> main
> |
> - |--41.99%--func_noinline
> + |--28.55%--func_inlined (inlined)
> + | func_noinline
> + | func_declared_inlined (inlined)
> + |
> + |--13.43%--func_noinline
> + | func_declared_inlined (inlined)
> |
> - --10.37%--func_noinline2
> + |--8.81%--func_noinline2
> + |
> + --1.57%--func_declared_inlined (inlined)
> + func_noinline2
>
> - 99.11% 0.00% a.out libc.so.6 [.] __libc_start_main@@GLIBC_2.34
> + 99.11% 0.00% a.out libc.so.6 [.] __libc_start_main_alias_2 (inlined)
> |
> - ---__libc_start_main@@GLIBC_2.34
> + ---__libc_start_main_alias_2 (inlined)
> __libc_start_call_main
> main
> |
> - |--41.99%--func_noinline
> + |--28.55%--func_inlined (inlined)
> + | func_noinline
> + | func_declared_inlined (inlined)
> + |
> + |--13.43%--func_noinline
> + | func_declared_inlined (inlined)
> + |
> + |--8.81%--func_noinline2
> |
> - --10.37%--func_noinline2
> + --1.57%--func_declared_inlined (inlined)
> + func_noinline2
>
> 99.11% 0.00% a.out libc.so.6 [.] __libc_start_call_main
> |
> ---__libc_start_call_main
> main
> |
> - |--41.99%--func_noinline
> + |--28.55%--func_inlined (inlined)
> + | func_noinline
> + | func_declared_inlined (inlined)
> |
> - --10.37%--func_noinline2
> + |--13.43%--func_noinline
> + | func_declared_inlined (inlined)
> + |
> + |--8.81%--func_noinline2
> + |
> + --1.57%--func_declared_inlined (inlined)
> + func_noinline2
>
> 54.44% 44.43% a.out a.out [.] func_noinline2
> |
> |--44.43%--_start
> - | __libc_start_main@@GLIBC_2.34
> + | __libc_start_main_alias_2 (inlined)
> | __libc_start_call_main
> | main
> |
> @@ -66,19 +103,42 @@
> 41.99% 17.47% a.out a.out [.] func_noinline
> |
> |--24.52%--func_noinline
> + | func_declared_inlined (inlined)
> |
> --17.47%--_start
> - __libc_start_main@@GLIBC_2.34
> + __libc_start_main_alias_2 (inlined)
> __libc_start_call_main
> main
> - func_noinline
> + |
> + |--11.05%--func_inlined (inlined)
> + | func_noinline
> + | func_declared_inlined (inlined)
> + |
> + --6.42%--func_noinline
> + func_declared_inlined (inlined)
> +
> + 41.99% 0.00% a.out a.out [.] func_declared_inlined (inlined)
> + |
> + ---func_declared_inlined (inlined)
> +
> + 28.55% 0.00% a.out a.out [.] func_inlined (inlined)
> + |
> + ---func_inlined (inlined)
> + func_noinline
> + func_declared_inlined (inlined)
> +
> + 1.57% 0.00% a.out a.out [.] func_declared_inlined (inlined)
> + |
> + ---func_declared_inlined (inlined)
> + func_noinline2
>
> 0.88% 0.00% a.out ld-linux-x86-64.so.2 [.] _start
> |
> ---_start
> _dl_start
> |
> - --0.71%--_dl_sysdep_start
> + --0.71%--_dl_start_final (inlined)
> + _dl_sysdep_start
> dl_main
> _dl_map_object_deps
> _dl_catch_exception
> @@ -92,7 +152,8 @@
> |
> ---_dl_start
> |
> - --0.71%--_dl_sysdep_start
> + --0.71%--_dl_start_final (inlined)
> + _dl_sysdep_start
> dl_main
> _dl_map_object_deps
> _dl_catch_exception
> @@ -106,6 +167,20 @@
> |
> ---_start
> _dl_start
> + _dl_start_final (inlined)
> + _dl_sysdep_start
> + dl_main
> + _dl_map_object_deps
> + _dl_catch_exception
> + openaux
> + _dl_map_object
> + _dl_map_object_from_fd
> + _dl_new_object
> + strlen
> +
> + 0.71% 0.00% a.out ld-linux-x86-64.so.2 [.] _dl_start_final (inlined)
> + |
> + ---_dl_start_final (inlined)
> _dl_sysdep_start
> dl_main
> _dl_map_object_deps
> ======
>
> No meaningful differences in output with callchains in dwarf mode or when
> tracing a binary that was compiled with no dwarf debuginfo.
>
> Artem Savkov (1):
> perf report: append inlines to non-dwarf callchains
>
> tools/perf/util/machine.c | 82 ++++++++++++++++++++-------------------
> 1 file changed, 43 insertions(+), 39 deletions(-)
>
> --
> 2.39.2
>
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