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SubjectRe: [PATCH] perf record: use unmapped IP for inline callchain cursors
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On 10/02/2018 09:02 PM, Arnaldo Carvalho de Melo wrote:
> Em Tue, Oct 02, 2018 at 09:39:49AM +0200, Milian Wolff escreveu:
>> Only use the mapped IP to find inline frames, but keep
>> using the unmapped IP for the callchain cursor. This
>> ensures we properly show the unmapped IP when displaying
>> a frame we received via the dso__parse_addr_inlines API
>> for a module which does not contain sufficient debug symbols
>> to show the srcline.
>
> So, the patch came mangled, I fixed it up, please check, I'm adding Ravi
> to the CC list, so that he can check as well and retest, right Ravi?
>
> - Arnaldo
>
> From d9ddee9653d5676130471de9bc688fc7ec7b4fc4 Mon Sep 17 00:00:00 2001
> From: Milian Wolff <milian.wolff@kdab.com>
> Date: Tue, 2 Oct 2018 09:39:49 +0200
> Subject: [PATCH 1/1] perf record: use unmapped IP for inline callchain cursors
>
> Only use the mapped IP to find inline frames, but keep using the unmapped IP
> for the callchain cursor. This ensures we properly show the unmapped IP when
> displaying a frame we received via the dso__parse_addr_inlines API for a module
> which does not contain sufficient debug symbols to show the srcline.
>
> Before:
>
> $ perf record -e cycles:u --call-graph ls
> $ perf script
> ...
> ls 12853 2735.563911: 43354 cycles:u:
> 17878 __GI___tunables_init+0xffff01d1d63a0118 (/usr/lib/ld-2.28.so)
> 19ee9 _dl_sysdep_start+0xffff01d1d63a02e9 (/usr/lib/ld-2.28.so)
> 3087 _dl_start+0xffff01d1d63a0287 (/usr/lib/ld-2.28.so)
> 2007 _start+0xffff01d1d63a0007 (/usr/lib/ld-2.28.so)
>
> After:
>
> $ perf script
> ...
> ls 12853 2735.563911: 43354 cycles:u:
> 7f1714e46878 __GI___tunables_init+0x118 (/usr/lib/ld-2.28.so)
> 7f1714e48ee9 _dl_sysdep_start+0x2e9 (/usr/lib/ld-2.28.so)
> 7f1714e32087 _dl_start+0x287 (/usr/lib/ld-2.28.so)
> 7f1714e31007 _start+0x7 (/usr/lib/ld-2.28.so)

With current perf/urgent:

$ sudo ./perf record --call-graph=dwarf -e probe_libc:inet_pton -- ping -6 -c 1 ::1
$ sudo ./perf script
ping 4109 [011] 767269.031273: probe_libc:inet_pton: (7fff944cb458)
15b458 __inet_pton+0xffff0000d7920008 (inlined)
10feb3 gaih_inet.constprop.7+0xffff0000d7920f43 (/usr/lib64/libc-2.26.
110a13 __GI_getaddrinfo+0xffff0000d7920163 (inlined)
13c752d6f _init+0xbfb (/usr/bin/ping)
2371f generic_start_main.isra.0+0xffff0000d792013f (/usr/lib64/libc-2
2391b __libc_start_main+0xffff0000d79200bb (/usr/lib64/libc-2.26.so)

With this patch:

$ sudo ./perf script
ping 4109 [011] 767269.031273: probe_libc:inet_pton: (7fff944cb458)
7fff944cb458 __inet_pton+0x8 (inlined)
7fff9447feb3 gaih_inet.constprop.7+0xf43 (/usr/lib64/libc-2.26.so)
7fff94480a13 __GI_getaddrinfo+0x163 (inlined)
13c752d6f _init+0xbfb (/usr/bin/ping)
7fff9439371f generic_start_main.isra.0+0x13f (/usr/lib64/libc-2.26.so)
7fff9439391b __libc_start_main+0xbb (/usr/lib64/libc-2.26.so)

LGTM.

Tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>

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