Messages in this thread Patch in this message | | | Date | Tue, 17 Nov 2020 14:54:00 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH 23/24] perf buildid-list: Add support for mmap2's buildid events |
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Em Tue, Nov 17, 2020 at 04:21:40PM +0100, Jiri Olsa escreveu: > On Tue, Nov 17, 2020 at 09:50:40AM -0300, Arnaldo Carvalho de Melo wrote: > > Em Tue, Nov 17, 2020 at 12:00:52PM +0100, Jiri Olsa escreveu: > > > Add buildid-list support for mmap2's build id data, so we can > > > display build ids for dso objects for data without the build > > > id cache update. > > > > > $ perf buildid-list > > > 1805c738c8f3ec0f47b7ea09080c28f34d18a82b /usr/lib64/ld-2.31.so > > > d278249792061c6b74d1693ca59513be1def13f2 /usr/lib64/libc-2.31.so > > > > > > By default only dso objects with hits are shown. > > > > Would be interesting to be able to show all the build ids that are > > there. a 'perf buildid-list --all' or make this under --force? > > ok, will check.. one other tool I think would be handy is > to show which debuginfo is not available, because it can > change the report a lot - missing symbols are not getting > accounted, and their hits are accounted only as separated > addresses
Right, as below.
So you suggest something like:
# perf buildid-cache --fetch-missing-debuginfo
?
- Arnaldo
[root@quaco ~]# rpm -qf `which stress-ng` stress-ng-0.11.21-1.fc32.x86_64 [root@quaco ~]# rpm -q stress-ng-debuginfo stress-ng-debuginfo-0.07.29-10.fc31.x86_64 [root@quaco ~]# perf record stress-ng -t 1 -c 1 stress-ng: info: [656926] dispatching hogs: 1 cpu stress-ng: info: [656926] successful run completed in 1.02s [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.204 MB perf.data (4082 samples) ] [root@quaco ~]# perf report | head -20 # To display the perf.data header info, please use --header/--header-only options. # # # Total Lost Samples: 0 # # Samples: 4K of event 'cycles' # Event count (approx.): 3997318603 # # Overhead Command Shared Object Symbol # ........ ............. ................ .............................. # 7.91% stress-ng-cpu stress-ng [.] 0x0000000000035ed9 7.15% stress-ng-cpu stress-ng [.] 0x0000000000035ecc 6.54% stress-ng-cpu stress-ng [.] 0x000000000003bbf6 4.39% stress-ng-cpu stress-ng [.] 0x000000000003a083 4.15% stress-ng-cpu stress-ng [.] 0x0000000000065ed8 3.67% stress-ng-cpu stress-ng [.] 0x0000000000065ecf 3.41% stress-ng-cpu stress-ng [.] 0x0000000000065ee1 3.11% stress-ng-cpu stress-ng [.] 0x000000000003bbf2 2.65% stress-ng-cpu stress-ng [.] 0x000000000003a07b [root@quaco ~]#
So the above is with a stress-ng-debuginfo package that doesn't matches the binary installed, so build-id checkign fails, resolving symbols fail, then:
[root@quaco ~]# rpm -q stress-ng-debuginfo stress-ng-debuginfo-0.11.21-1.fc32.x86_64 [root@quaco ~]# rpm -q stress-ng stress-ng-0.11.21-1.fc32.x86_64 [root@quaco ~]#
[root@quaco ~]# rpm -q stress-ng-debuginfo stress-ng-debuginfo-0.11.21-1.fc32.x86_64 [root@quaco ~]# rpm -q stress-ng stress-ng-0.11.21-1.fc32.x86_64 [root@quaco ~]# perf report | head -20 # To display the perf.data header info, please use --header/--header-only options. # # # Total Lost Samples: 0 # # Samples: 4K of event 'cycles' # Event count (approx.): 3997318603 # # Overhead Command Shared Object Symbol # ........ ............. ............. ......................................... # 21.48% stress-ng-cpu stress-ng [.] is_prime 16.02% stress-ng-cpu stress-ng [.] stress_cpu_sieve 12.61% stress-ng-cpu stress-ng [.] stress_cpu_cpuid.sse2.2 11.94% stress-ng-cpu stress-ng [.] ackermann 8.24% stress-ng-cpu stress-ng [.] stress_cpu_correlate 3.82% stress-ng-cpu stress-ng [.] queens_try 2.63% stress-ng-cpu stress-ng [.] stress_cpu_nsqrt.sse2.2 2.46% stress-ng-cpu stress-ng [.] ccitt_crc16 2.25% stress-ng-cpu stress-ng [.] stress_cpu_complex_long_double.sse2.2 [root@quaco ~]#
[root@quaco ~]# perf report -v | head -20 build id event received for vmlinux: f72ec65d81949c5ba63ccaa16b59c79d1696bc4d [20] build id event received for /usr/bin/stress-ng: 82b81bd823dcac393292faaaf40997723ce358a8 [20] build id event received for [vdso]: a1f89b9b9d2093ae926c550a7de060d435277fbf [20] build id event received for /usr/lib64/libm-2.31.so: fdf1f1d0761b7392e419d5d72e43d3fd3db6e184 [20] build id event received for /usr/lib64/libc-2.31.so: d278249792061c6b74d1693ca59513be1def13f2 [20] Looking at the vmlinux_path (8 entries long) symsrc__init: build id mismatch for vmlinux. Using /usr/lib/debug/lib/modules/5.8.14-200.fc32.x86_64/vmlinux for symbols # To display the perf.data header info, please use --header/--header-only options. # # # Total Lost Samples: 0 # # Samples: 4K of event 'cycles' # Event count (approx.): 3997318603 # # Overhead Command Shared Object Symbol # ........ ............. .................. .................................................... # 21.48% stress-ng-cpu /usr/bin/stress-ng 0x35e80 l [.] is_prime 16.02% stress-ng-cpu /usr/bin/stress-ng 0x3bbf6 l [.] stress_cpu_sieve 12.61% stress-ng-cpu /usr/bin/stress-ng 0x65ec6 l [.] stress_cpu_cpuid.sse2.2 11.94% stress-ng-cpu /usr/bin/stress-ng 0x3c66b l [.] ackermann 8.24% stress-ng-cpu /usr/bin/stress-ng 0x39fd8 l [.] stress_cpu_correlate 3.82% stress-ng-cpu /usr/bin/stress-ng 0x64742 l [.] queens_try 2.63% stress-ng-cpu /usr/bin/stress-ng 0x7a0a8 l [.] stress_cpu_nsqrt.sse2.2 2.46% stress-ng-cpu /usr/bin/stress-ng 0x3400e l [.] ccitt_crc16 2.25% stress-ng-cpu /usr/bin/stress-ng 0x71761 l [.] stress_cpu_complex_long_double.sse2.2 [root@quaco ~]# > > jirka > > > > > - Arnaldo > > > > > Signed-off-by: Jiri Olsa <jolsa@kernel.org> > > > --- > > > tools/perf/builtin-buildid-list.c | 3 +++ > > > 1 file changed, 3 insertions(+) > > > > > > diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c > > > index e3ef75583514..87f5b1a4a7fa 100644 > > > --- a/tools/perf/builtin-buildid-list.c > > > +++ b/tools/perf/builtin-buildid-list.c > > > @@ -77,6 +77,9 @@ static int perf_session__list_build_ids(bool force, bool with_hits) > > > perf_header__has_feat(&session->header, HEADER_AUXTRACE)) > > > with_hits = false; > > > > > > + if (!perf_header__has_feat(&session->header, HEADER_BUILD_ID)) > > > + with_hits = true; > > > + > > > /* > > > * in pipe-mode, the only way to get the buildids is to parse > > > * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID > > > -- > > > 2.26.2 > > > > > > > -- > > > > - Arnaldo > > >
--
- Arnaldo
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