From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Cross platform perf reporting Date: Mon, 15 Aug 2016 14:20:15 +0200 Message-ID: <18625452.F1CIFXVKL2@milian-kdab2> References: <20160812153125.GK27651@kernel.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2155981.m03nQMB48J"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:56448 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752748AbcHOMUU (ORCPT ); Mon, 15 Aug 2016 08:20:20 -0400 In-Reply-To: <20160812153125.GK27651@kernel.org> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: acme@kernel.org Cc: linux-perf-users@vger.kernel.org, dsahern@gmail.com, hekuang@huawei.com --nextPart2155981.m03nQMB48J Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Friday, August 12, 2016 12:31:25 PM CEST Arnaldo Carvalho de Melo wrote: > Em Fri, Aug 12, 2016 at 05:10:18PM +0200, Milian Wolff escreveu: > > On Friday, August 12, 2016 2:22:29 PM CEST Milian Wolff wrote: > > > I'm trying to analyze perf.data files that I recorded on one machine > > > (usually arm or arm64) on my development machine (x86_64). I have > > > compiled > > > a new version of perf (and the corresponding dependencies, where needed) > > > to > > > do this. > > Adding He Kuang, that did work on this area recently. > > > > Now I do: > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~ > > > aarch64$ perf record -g ... > > > aarch64$ perf archive > > > > > > x86_64$ scp aarch64:perf.data* . > > > x86_64$ tar xvf perf.data.tar.bz2 -C ~/.debug > > > x86_64$ perf report |& less > > > -> lots of errors, none of which are displayed in the TUI, such as: > > > > > > unwind: target platform=arm64 is not supported > > > (often repeated) > > > Failed to open /lib/ld-2.21.so, continuing without symbols > > > Failed to open /lib/libc-2.21.so, continuing without symbols > > > Failed to open /lib/libpthread-2.21.so, continuing without symbols > > > Failed to open /lib/libdl-2.21.so, continuing without symbols > > > ... > > > ~~~~~~~~~~~~~~~~~~~~~~~~ > > > > What I notice, is that `perf buildid-list` does not contain any of these > > That is a limitation that needs fixing, what gets into the build-id are > entries that had hits, DSOs, but those are sample hits, not callchain > hits. > > We would have to traverse all callchains and add build-id entries for > the DSOs in it. > > I need to do this :-\ > > But if you have a copy of your target in a file and use --symfs with it it > should work, because then, because it doesn't have the build-id for the DSOs > in the callchains that didn't had hits, it will resort to using just the > pathname when looking for a symtab or the whole ELF for annotation, etc. > > > files. I also don't have the corresponding files in my target's ~/.debug > > folder, where everything seems to work as expected. Is that, because there > > the symbols are read directly from the file and nothing is cached in > > ~/.debug? > > That is a possibility, yes. But it should be adding it to ~/.debug, that > is the default, unless you have something disabling that in your > ~/.perfconfig or some sort of problem is happening that is preventing it > to do the hardlink/copy. I now realized that the culprit here is actually a broken platform, i.e. the libs above simply don't have a build id: eu-readelf -n libc.so.6 Note section [ 1] '.note.ABI-tag' of 32 bytes at offset 0x270: Owner Data size Type GNU 16 VERSION OS: Linux, ABI: 3.18.0 So no wonder they are not included in perf archive. I think a warning would be helpful here to tell users that analyzing the data on the remote machine will require --symfs (which I wasn't aware of, thanks!). > > Can I set an environment variable to let perf know to look in secondary > > paths for the libraries? I.e. I hope to make it look into the cross > > compile sysroot for these libraries, instead of literally interpreting > > the path as a valid path on my development machine. > > That is the --symfs David talked about, no? > > [acme@jouet linux]$ perf report -h symfs > > Usage: perf report [] > > --symfs > Look for files with symbols relative to this > directory Yes, symfs sounds exactly like what I was looking for. I have now tested this, and seem to hit some issues with it: I unpacked a perf archive from a platform which includes a libc with buildit: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ milian@milian-kdab2:/tmp$ tar -tvf perf.data.tar.bz2 | grep libc-2.19 lrwxrwxrwx root/root 0 2000-01-01 18:36 .build-id/ 45/7c5918872338e1b82bf8bf41ae9f55b34604ea -> ../../lib/arm-linux-gnueabihf/ libc-2.19.so/457c5918872338e1b82bf8bf41ae9f55b34604ea drwxr-xr-x root/root 0 2000-01-01 18:36 lib/arm-linux-gnueabihf/ libc-2.19.so/457c5918872338e1b82bf8bf41ae9f55b34604ea/ -rwxr-xr-x root/root 911068 2016-03-01 01:55 lib/arm-linux-gnueabihf/ libc-2.19.so/457c5918872338e1b82bf8bf41ae9f55b34604ea/elf -rw-r--r-- root/root 0 2000-01-01 18:36 lib/arm-linux-gnueabihf/ libc-2.19.so/457c5918872338e1b82bf8bf41ae9f55b34604ea/probes ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Analyzing it for some reason isn't using the build id: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ milian@milian-kdab2:/tmp$ strace -e file -f perf report --stdio -s sym,srcline |& grep libc-2.19 stat("/lib/arm-linux-gnueabihf/libc-2.19.so", 0x7ffde9316200) = -1 ENOENT (No such file or directory) stat("/lib/arm-linux-gnueabihf/libc-2.19.so", 0x7ffde9316180) = -1 ENOENT (No such file or directory) stat("/usr/lib/debug/lib/arm-linux-gnueabihf/libc-2.19.so.debug", 0x7ffde9316200) = -1 ENOENT (No such file or directory) stat("/usr/lib/debug/lib/arm-linux-gnueabihf/libc-2.19.so", 0x7ffde9316200) = -1 ENOENT (No such file or directory) stat("/lib/arm-linux-gnueabihf/libc-2.19.so", 0x7ffde9316200) = -1 ENOENT (No such file or directory) stat("/lib/arm-linux-gnueabihf/.debug/libc-2.19.so", 0x7ffde9316200) = -1 ENOENT (No such file or directory) open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so 0.25% 0.25% [.] 0x000000000005336c libc-2.19.so[5336c] 0.25% 0.00% [.] 0xffffffff4936136c libc-2.19.so[ffffffff4936136 0.24% 0.24% [.] 0x0000000000053422 libc-2.19.so[53422] 0.24% 0.00% [.] 0xffffffff49361422 libc-2.19.so[ffffffff4936142 0.21% 0.21% [.] 0x0000000000053664 libc-2.19.so[53664] 0.21% 0.00% [.] 0xffffffff49361664 libc-2.19.so[ffffffff4936166 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Setting symfs: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ milian@milian-kdab2:/tmp$ locate libc-2.19.so /home/milian/.debug/lib/arm-linux-gnueabihf/libc-2.19.so /home/milian/.debug/lib/arm-linux-gnueabihf/libc-2.19.so/ 457c5918872338e1b82bf8bf41ae9f55b34604ea /home/milian/.debug/lib/arm-linux-gnueabihf/libc-2.19.so/ 457c5918872338e1b82bf8bf41ae9f55b34604ea/elf /home/milian/.debug/lib/arm-linux-gnueabihf/libc-2.19.so/ 457c5918872338e1b82bf8bf41ae9f55b34604ea/probes /ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/lib/arm- linux-gnueabihf/libc-2.19.so milian@milian-kdab2:/tmp$ strace -e file -f perf report --symfs=/ssd/milian/ projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/ --stdio -s sym,srcline |& grep libc-2.19 open("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = 8 stat("/lib/arm-linux-gnueabihf/libc-2.19.so", 0x7ffc4da5e740) = -1 ENOENT (No such file or directory) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/libc-2.19.so", {st_mode=S_IFREG|0755, st_size=911068, ...}) = 0 open("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = 9 stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/libc-2.19.so", {st_mode=S_IFREG|0755, st_size=911068, ...}) = 0 open("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = 9 stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// usr/lib/debug/lib/arm-linux-gnueabihf/libc-2.19.so.debug", 0x7ffc4da5e740) = -1 ENOENT (No such file or directory) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// usr/lib/debug/lib/arm-linux-gnueabihf/libc-2.19.so", 0x7ffc4da5e740) = -1 ENOENT (No such file or directory) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/libc-2.19.so", {st_mode=S_IFREG|0755, st_size=911068, ...}) = 0 open("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = 10 stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// lib/arm-linux-gnueabihf/.debug/libc-2.19.so", 0x7ffc4da5e740) = -1 ENOENT (No such file or directory) open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so open("/lib/arm-linux-gnueabihf/libc-2.19.so", O_RDONLY) = -1 ENOENT (No such file or directory) addr2line_init failed for /lib/arm-linux-gnueabihf/libc-2.19.so 0.25% 0.25% [.] 0x000000000005336c libc-2.19.so[5336c] 0.25% 0.00% [.] 0xffffffff4936136c libc-2.19.so[ffffffff4936136 0.24% 0.24% [.] 0x0000000000053422 libc-2.19.so[53422] 0.24% 0.00% [.] 0xffffffff49361422 libc-2.19.so[ffffffff4936142 0.21% 0.21% [.] 0x0000000000053664 libc-2.19.so[53664] 0.21% 0.00% [.] 0xffffffff49361664 libc-2.19.so[ffffffff4936166 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Note how it does look into symfs sometimes, but not everywhere... To make things worse, it seems to break the buildid lookup, i.e. when you get samples in a file that you deployed manually to a target, which is not included in your sysroot that you pass to symfs: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ $ perf report --stdio -s sym,srcline |& grep particles 34.79% 34.79% [.] main particles.cpp:34 32.62% 32.62% [.] main particles.cpp:33 9.85% 9.85% [.] main particles.cpp:32 $ perf report --symfs=/ssd/milian/projects/pandaboard/debian-8.5-minimal- armhf-2016-06-06/ --stdio -s sym,srcline |& grep particles /root/particles with build id 1c10a17afa25337ab368f8d9e690184e536c6563 not found, continuing without symbols addr2line_init failed for /root/particles # above line is repeated a lot 26.99% 26.99% [.] 0x00000000000005a4 particles[5a4] 26.99% 0.00% [.] 0xffffffffffff05a4 particles[ffffffffffff05a4] 21.83% 21.83% [.] 0x00000000000005a6 particles[5a6] 21.83% 0.00% [.] 0xffffffffffff05a6 particles[ffffffffffff05a6] 14.55% 0.00% [.] 0xffffffffffff0596 particles[ffffffffffff0596] 14.54% 14.54% [.] 0x0000000000000596 particles[596] ... $ strace -e file -f perf report --symfs=/ssd/milian/projects/pandaboard/ debian-8.5-minimal-armhf-2016-06-06/ --stdio -s sym,srcline |& grep particles open("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// root/particles", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/root/particles", 0x7ffe7535bf40) = -1 EACCES (Permission denied) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// root/particles", 0x7ffe7535bec0) = -1 ENOENT (No such file or directory) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// usr/lib/debug/root/particles.debug", 0x7ffe7535bf40) = -1 ENOENT (No such file or directory) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// usr/lib/debug/root/particles", 0x7ffe7535bf40) = -1 ENOENT (No such file or directory) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// root/particles", 0x7ffe7535bf40) = -1 ENOENT (No such file or directory) stat("/ssd/milian/projects/pandaboard/debian-8.5-minimal-armhf-2016-06-06/// root/.debug/particles", 0x7ffe7535bf40) = -1 ENOENT (No such file or directory) /root/particles with build id 1c10a17afa25337ab368f8d9e690184e536c6563 not found, continuing without symbols ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Note how the above does not look for the buildid in my ~/.debug anymore... Cheers -- Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts --nextPart2155981.m03nQMB48J Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD ExJVVE4gLSBEQVRBQ29ycCBTR0MwHhcNMDUwNjA3MDgwOTEwWhcNMTkwNjI0MTkwNjMwWjBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVy bmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MIIBIjAN BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt/caM+byAAQtOeBOW+0fvGwPzbX6I7bO3psRM5ek 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