linux-kernel - Re: [PATCH] perf tests: Fix regex for record+probe_libc_inet

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Date:   Fri, 18 May 2018 16:30:15 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Sandipan Das <sandipan@...ux.vnet.ibm.com>
Cc:     jolsa@...hat.com, linux-kernel@...r.kernel.org,
        ravi.bangoria@...ux.ibm.com, naveen.n.rao@...ux.vnet.ibm.com,
        tmricht@...ux.ibm.com
Subject: Re: [PATCH] perf tests: Fix regex for record+probe_libc_inet_pton.sh

Em Fri, May 18, 2018 at 04:29:16PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, May 18, 2018 at 04:21:02PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Here it went from failing with:
> > 
> > [root@...enth ~]# perf test -v pton
> > 64: probe libc's inet_pton & backtrace it with ping       :
> > --- start ---
> > test child forked, pid 22590
> > ping 22607 [001] 12782.425689: probe_libc:inet_pton: (7f8686da4e40)
> > 7f8686da4e40 __GI___inet_pton+0x0 (/usr/lib64/libc-2.26.so)
> > FAIL: expected backtrace entry 1 ".*inet_pton[[:space:]]\(/usr/lib64/libc-2.26.so|inlined\)$" got "7f8686da4e40 __GI___inet_pton+0x0 (/usr/lib64/libc-2.26.so)"
> > test child finished with -1
> > ---- end ----
> > probe libc's inet_pton & backtrace it with ping: FAILED!
> > [root@...enth ~]# 
> > 
> > To failing with:
> > 
> > [root@...enth ~]# perf test -v pton
> > 64: probe libc's inet_pton & backtrace it with ping       :
> > --- start ---
> > test child forked, pid 28954
> > ping 28971 [002] 14277.711200: probe_libc:inet_pton: (7fc9d66e3e40)
> > 7fc9d66e3e40 __GI___inet_pton+0x0 (/usr/lib64/libc-2.26.so)
> > 7fc9d66b02b4 getaddrinfo+0x124 (/usr/lib64/libc-2.26.so)
> > 56075cb98f40 [unknown] (/usr/bin/ping)
> > FAIL: expected backtrace entry 3 ".*\+0x[[:xdigit:]]+[[:space:]]\(.*/bin/ping.*\)$" got "56075cb98f40 [unknown] (/usr/bin/ping)"
> > test child finished with -1
> > ---- end ----
> > probe libc's inet_pton & backtrace it with ping: FAILED!
> > [root@...enth ~]# 
> > 
> > Trying to figure this out...
> 
> [root@...enth perf]# perf script
> ping 29170 [001] 14644.810782: probe_libc:inet_pton: (7f0bac71be40)
>             7f0bac71be40 __GI___inet_pton+0x0 (/usr/lib64/libc-2.26.so)
>             7f0bac6e82b4 getaddrinfo+0x124 (/usr/lib64/libc-2.26.so)
>             5585e10adf40 [unknown] (/usr/bin/ping)
> 
> [root@...enth perf]# perf report --mmaps
> #      pid      tid     ppid  comm
>          0        0       -1 |swapper
>      29170    29170       -1 |ping
>                                 5585e10ab000-5585e12dd000 r-xp 00000000 2771393 /usr/bin/ping
>                                 7f0babfcf000-7f0bac1ed000 r-xp 00000000 2762913 /usr/lib64/libpthread-2.26.so
>                                 7f0bac1ed000-7f0bac3f1000 r-xp 00000000 2753363 /usr/lib64/libdl-2.26.so
>                                 7f0bac3f1000-7f0bac608000 r-xp 00000000 2760078 /usr/lib64/libz.so.1.2.11
>                                 7f0bac608000-7f0bac9be000 r-xp 00000000 2753359 /usr/lib64/libc-2.26.so
>                                 7f0bac9be000-7f0bacd09000 r-xp 00000000 2762901 /usr/lib64/libm-2.26.so
>                                 7f0bacd09000-7f0bacf20000 r-xp 00000000 2762915 /usr/lib64/libresolv-2.26.so
>                                 7f0bacf20000-7f0bad3a8000 r-xp 00000000 2764213 /usr/lib64/libcrypto.so.1.1.0h
>                                 7f0bad3a8000-7f0bad5dc000 r-xp 00000000 2761070 /usr/lib64/libidn.so.11.6.18
>                                 7f0bad5dc000-7f0bad7e1000 r-xp 00000000 2760189 /usr/lib64/libcap.so.2.25
>                                 7f0bad7e1000-7f0bada08000 r-xp 00000000 2753353 /usr/lib64/ld-2.26.so
>                                 7ffe23d99000-7ffe23d9b000 r-xp 00000000 0 [vdso]
> [root@...enth perf]# 
> 
> So it is there, but I don't have debuginfo for ping, lets see if I add
> it...
> 
> [root@...enth perf]# rpm -qf `which ping`
> iputils-20161105-7.fc27.x86_64
> [root@...enth perf]# 
> [root@...enth perf]# dnf debuginfo-install iputils
> 
> [root@...enth perf]# perf script
> ping 29170 [001] 14644.810782: probe_libc:inet_pton: (7f0bac71be40)
>             7f0bac71be40 __GI___inet_pton+0x0 (/usr/lib64/libc-2.26.so)
>             7f0bac6e82b4 getaddrinfo+0x124 (/usr/lib64/libc-2.26.so)
>             5585e10adf40 main+0x880 (/usr/bin/ping)
> 
> [root@...enth perf]# 
> 
> So we need to check if debuginfo is available, and if so, expect it to
> resolve that entry to main, if not, expect it to _not_ resolve and have
> [unknown]  instead...

But tis is not related to your recent patches, so I'm folding this last
one with the one adding the offsets and go on from there...

- Arnaldo