Message-ID: <Y1fgVUaOhEdYro2P@kernel.org>
Date:   Tue, 25 Oct 2022 10:10:45 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>,
        "Justin M. Forbes" <jforbes@...oraproject.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 3/8] perf test: Use a test program in perf record tests

Em Mon, Oct 24, 2022 at 09:12:21PM -0700, Namhyung Kim escreveu:
> On Mon, Oct 24, 2022 at 9:00 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> > Em Mon, Oct 24, 2022 at 05:00:14PM +0300, Adrian Hunter escreveu:
> > > On 24/10/22 14:33, Arnaldo Carvalho de Melo wrote:
> > > > Em Thu, Oct 20, 2022 at 04:52:14PM -0700, Ian Rogers escreveu:
> > > >> I wonder if these utilities should just be built into perf to avoid
> > > >> the cc dependency. Perhaps we can have a hidden option built into
> > > >> perf test.

> > > > Agreed, not depending on a compiler makes 'perf test' usable in more
> > > > systems, particularly production ones where we may want to check if perf
> > > > is passing all tests applicable to that system.

> > > I haven't seen anyone package anything except the perf executable, so
> > > I presume the only people running these tests install the source, and
> > > so need a compiler anyway.

> > Humm?

> > [root@...co ~]# head -3 /etc/os-release
> > NAME="Fedora Linux"
> > VERSION="36 (Workstation Edition)"
> > ID=fedora
> > [root@...co ~]#G

> > [root@...co ~]# rpm -qi perf
> > Name        : perf
> > Version     : 5.19.4
> > Release     : 200.fc36
> > Architecture: x86_64
> > Install Date: Mon 24 Oct 2022 12:57:34 PM -03
> > Group       : Unspecified
> > Size        : 12663136
> > License     : GPLv2
> > Signature   : RSA/SHA256, Thu 25 Aug 2022 07:16:04 PM -03, Key ID 999f7cbf38ab71f4
> > Source RPM  : kernel-tools-5.19.4-200.fc36.src.rpm
> > Build Date  : Thu 25 Aug 2022 06:30:42 PM -03
> > Build Host  : bkernel02.iad2.fedoraproject.org
> > Packager    : Fedora Project
> > Vendor      : Fedora Project
> > URL         : http://www.kernel.org/
> > Bug URL     : https://bugz.fedoraproject.org/kernel-tools
> > Summary     : Performance monitoring for the Linux kernel
> > Description :
> > This package contains the perf tool, which enables performance monitoring
> > of the Linux kernel.
> > [root@...co ~]#
> >
> > [root@...co ~]# rpm -ql perf
> > /etc/bash_completion.d/perf
> > /usr/bin/perf
> > /usr/lib/.build-id
> > /usr/lib/.build-id/0c
> > /usr/lib/.build-id/0c/54d587cab1b533b9ab777717ddd256ff84f241
> > /usr/lib/.build-id/15
> > /usr/lib/.build-id/15/6552556be0d4ca8cffb8e002d8a67add55aed5
> > /usr/lib/.build-id/15/c4dfaa3861f530ef60def5506385d4b0b8924f
> > /usr/lib/.build-id/1f
> > /usr/lib/.build-id/1f/799c084e326516a24a647cfd5f484cd054e0a2
> > /usr/lib/.build-id/23
> > /usr/lib/.build-id/23/311fe148dd3f3d487ca5ace54ff2faa72ea8da
> > /usr/lib/.build-id/37
> > /usr/lib/.build-id/37/c9ee70f321fae7fc1fc00fca91514c63f9f052
> > /usr/lib/.build-id/54
> > /usr/lib/.build-id/54/43b6bc332ad188b907fdde69ac02c9a69d158f
> > /usr/lib/.build-id/7e
> > /usr/lib/.build-id/7e/55e7a8e4df03137ec23b4135e205bc8eb77e05
> > /usr/lib/.build-id/84
> > /usr/lib/.build-id/84/3c3863a123d129c98fa7cb99a58d620c9e5edc
> > /usr/lib/.build-id/86
> > /usr/lib/.build-id/86/d063d2f9833a447d96504e5f9e472048d12c49
> > /usr/lib/.build-id/98
> > /usr/lib/.build-id/98/a28589fde6ce95d9f3d305f7c9853333a9415b
> > /usr/lib/.build-id/9e
> > /usr/lib/.build-id/9e/567f55ca9c2b4867eb95d4182da07d4843976d
> > /usr/lib/.build-id/b6
> > /usr/lib/.build-id/b6/f8c9a6d6e1990f8577a9fbac875f812a316a20
> > /usr/lib/.build-id/c0
> > /usr/lib/.build-id/c0/8b255f02ce8f3e90df2b6156d2d38b1221995d
> > /usr/lib/.build-id/d5/e964c3413f52492e6355852d25b2ab23b03e38
> > /usr/lib/.build-id/e8
> > /usr/lib/.build-id/e8/2de614bf77f501a4511cb70151b98392669c77
> 
> Interesting, it contains some build-ids for system libraries?

[acme@...co ~]$ ls -la /usr/lib/.build-id/e8/2de614bf77f501a4511cb70151b98392669c77
lrwxrwxrwx. 1 root root 67 Aug 25 18:33 /usr/lib/.build-id/e8/2de614bf77f501a4511cb70151b98392669c77 -> ../../../../usr/libexec/perf-core/dlfilters/dlfilter-test-api-v0.so
[acme@...co ~]$

Yeah, strange:

[acme@...co ~]$ rpm -ql perf | grep build-id/../
/usr/lib/.build-id/0c/54d587cab1b533b9ab777717ddd256ff84f241
/usr/lib/.build-id/15/6552556be0d4ca8cffb8e002d8a67add55aed5
/usr/lib/.build-id/15/c4dfaa3861f530ef60def5506385d4b0b8924f
/usr/lib/.build-id/1f/799c084e326516a24a647cfd5f484cd054e0a2
/usr/lib/.build-id/23/311fe148dd3f3d487ca5ace54ff2faa72ea8da
/usr/lib/.build-id/37/c9ee70f321fae7fc1fc00fca91514c63f9f052
/usr/lib/.build-id/54/43b6bc332ad188b907fdde69ac02c9a69d158f
/usr/lib/.build-id/7e/55e7a8e4df03137ec23b4135e205bc8eb77e05
/usr/lib/.build-id/84/3c3863a123d129c98fa7cb99a58d620c9e5edc
/usr/lib/.build-id/86/d063d2f9833a447d96504e5f9e472048d12c49
/usr/lib/.build-id/98/a28589fde6ce95d9f3d305f7c9853333a9415b
/usr/lib/.build-id/9e/567f55ca9c2b4867eb95d4182da07d4843976d
/usr/lib/.build-id/b6/f8c9a6d6e1990f8577a9fbac875f812a316a20
/usr/lib/.build-id/c0/8b255f02ce8f3e90df2b6156d2d38b1221995d
/usr/lib/.build-id/d5/e964c3413f52492e6355852d25b2ab23b03e38
/usr/lib/.build-id/e8/2de614bf77f501a4511cb70151b98392669c77
[acme@...co ~]$
[acme@...co ~]$ rpm -ql perf | grep build-id/../ | xargs realpath
/usr/lib64/traceevent/plugins/plugin_sched_switch.so
/usr/lib64/traceevent/plugins/plugin_kmem.so
/usr/lib64/traceevent/plugins/plugin_tlb.so
/usr/lib64/traceevent/plugins/plugin_jbd2.so
/usr/lib64/traceevent/plugins/plugin_hrtimer.so
/usr/lib64/traceevent/plugins/plugin_mac80211.so
/usr/lib64/libperf-jvmti.so
/usr/lib64/traceevent/plugins/plugin_cfg80211.so
/usr/lib64/traceevent/plugins/plugin_xen.so
/usr/lib64/traceevent/plugins/plugin_kvm.so
/usr/libexec/perf-core/dlfilters/dlfilter-show-cycles.so
/usr/lib64/traceevent/plugins/plugin_scsi.so
/usr/lib64/traceevent/plugins/plugin_futex.so
/usr/bin/perf
/usr/lib64/traceevent/plugins/plugin_function.so
/usr/libexec/perf-core/dlfilters/dlfilter-test-api-v0.so
[acme@...co ~]$ rpm -ql perf | grep build-id/../ | xargs realpath | xargs rpm -qf
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
perf-5.19.4-200.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
perf-5.19.4-200.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
perf-5.19.4-200.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
perf-5.19.4-200.fc36.x86_64
[acme@...co ~]$

Humm, but then the build-ids are different...

[acme@...co ~]$ rpm -ql libtraceevent | grep build-id/../
/usr/lib/.build-id/00/59bd37dc1c345eb2f98cf2bc1163bc1fd4b63e
/usr/lib/.build-id/00/b22aa8cc2b81e4cb383d8b4dc14cbeb958fda6
/usr/lib/.build-id/11/6a8d17c89795d2269d3d65906ea7c7c5bcb856
/usr/lib/.build-id/24/8bfb4534954eb71ab3e5f7887507cb8981f921
/usr/lib/.build-id/57/0768e8ea5155cf2759c4f5dca3736a73c3dfad
/usr/lib/.build-id/61/2744cd9cb2d1b0c569b0c86578d11be7227f27
/usr/lib/.build-id/9d/630834441f4e382ddcecef810b100737bb56e4
/usr/lib/.build-id/b0/57189b558351ace427ae0a650c248deca4badd
/usr/lib/.build-id/b1/a0003b83e307cf61d7c8a2751e5c78e6ccfc87
/usr/lib/.build-id/b4/b8a30ebf86cb849bcb0cabc4d452c1a44487cc
/usr/lib/.build-id/ce/5e0647f756ec2c30b2e6df9a5a98e552871cb6
/usr/lib/.build-id/e0/a6a6207f56674ffacd7b063fd2acd4cec3f661
/usr/lib/.build-id/f4/86fb5b3072945405d0590045715d18adc7aa18
[acme@...co ~]$
[acme@...co ~]$ rpm -ql libtraceevent | grep build-id/../ | xargs realpath
/usr/lib64/traceevent/plugins/plugin_function.so
/usr/lib64/traceevent/plugins/plugin_scsi.so
/usr/lib64/traceevent/plugins/plugin_futex.so
/usr/lib64/traceevent/plugins/plugin_cfg80211.so
/usr/lib64/traceevent/plugins/plugin_hrtimer.so
/usr/lib64/traceevent/plugins/plugin_mac80211.so
/usr/lib64/traceevent/plugins/plugin_sched_switch.so
/usr/lib64/traceevent/plugins/plugin_jbd2.so
/usr/lib64/traceevent/plugins/plugin_tlb.so
/usr/lib64/traceevent/plugins/plugin_xen.so
/usr/lib64/traceevent/plugins/plugin_kvm.so
/usr/lib64/traceevent/plugins/plugin_kmem.so
/usr/lib64/libtraceevent.so.1.5.3
[acme@...co ~]$ rpm -ql libtraceevent | grep build-id/../ | xargs realpath  | xargs rpm -qf
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
libtraceevent-1.5.3-2.fc36.x86_64
[acme@...co ~]$

I.e. libtraceevent has the plugins and the build-id symlinks, perf has
just the symlinks:

[acme@...co ~]$ rpm -ql libtraceevent | grep plugin_.*so
/usr/lib64/traceevent/plugins/plugin_cfg80211.so
/usr/lib64/traceevent/plugins/plugin_function.so
/usr/lib64/traceevent/plugins/plugin_futex.so
/usr/lib64/traceevent/plugins/plugin_hrtimer.so
/usr/lib64/traceevent/plugins/plugin_jbd2.so
/usr/lib64/traceevent/plugins/plugin_kmem.so
/usr/lib64/traceevent/plugins/plugin_kvm.so
/usr/lib64/traceevent/plugins/plugin_mac80211.so
/usr/lib64/traceevent/plugins/plugin_sched_switch.so
/usr/lib64/traceevent/plugins/plugin_scsi.so
/usr/lib64/traceevent/plugins/plugin_tlb.so
/usr/lib64/traceevent/plugins/plugin_xen.so
[acme@...co ~]$ rpm -ql perf | grep plugin_.*so
[acme@...co ~]$ 

And perf is being built with the libtraceevent that is in fedora:

[acme@...co ~]$ ldd `which perf` | grep traceevent
	libtraceevent.so.1 => /lib64/libtraceevent.so.1 (0x00007f43496dc000)
[acme@...co ~]$ rpm -qf /lib64/libtraceevent.so.1
libtraceevent-1.5.3-2.fc36.x86_64
[acme@...co ~]$ rpm -qf /usr/bin/perf
perf-5.19.4-200.fc36.x86_64
[acme@...co ~]$
[acme@...co ~]$ file /usr/bin/perf
/usr/bin/perf: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=c08b255f02ce8f3e90df2b6156d2d38b1221995d, for GNU/Linux 3.2.0, stripped
[acme@...co ~]$

So it seems its just a matter of removing those /usr/lib/.build-id/
symlinks to the libtraceevent plugins from the fedora perf rpm.

Justin?

- Arnaldo

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