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Message-ID: <20160413070329.GB24126@gmail.com> Date: Wed, 13 Apr 2016 09:03:29 +0200 From: Ingo Molnar <mingo@...nel.org> To: Arnaldo Carvalho de Melo <acme@...nel.org> Cc: linux-kernel@...r.kernel.org, Adrian Hunter <adrian.hunter@...el.com>, David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>, Milian Wolff <milian.wolff@...b.com>, Namhyung Kim <namhyung@...nel.org>, pi3orama@....com, Wang Nan <wangnan0@...wei.com>, Zefan Li <lizefan@...wei.com>, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: Re: [GIT PULL 00/19] perf/core improvements * Arnaldo Carvalho de Melo <acme@...nel.org> wrote: > Hi Ingo, > > Please consider pulling, tested with 'perf test', 'make -C tools/perf > build-test' and building on these userspaces, using docker: > > # dm > alldeps-fedora-rawhide-minus-python-dev: Ok > alldeps-fedora-20: Ok > alldeps-ubuntu-12.04: Ok > minimal-debian-experimental-x-mips64: Ok > minimal-debian-experimental-x-mips64el: Ok > minimal-debian-experimental-x-mipsel: Ok > minimal-ubuntu-x-arm: Ok > minimal-ubuntu-x-arm64: Ok > minimal-ubuntu-x-ppc64: Ok > minimal-ubuntu-x-ppc64el: Ok > alldeps-debian: Ok > alldeps-mageia: Ok > alldeps-rhel7: Ok > alldeps-centos: Ok > alldeps-opensuse: Ok > alldeps-ubuntu: Ok > # > > This is on top of my previous pull request, that is not yet > merged: perf-core-for-mingo-20160408. > > Best regards, > > - Arnaldo > > The following changes since commit 99e87f7bb7268cf644add87130590966fd5d0d17: > > perf symbols: Adjust symbol for shared objects (2016-04-08 09:58:15 -0300) > > are available in the git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo-20160411 > > for you to fetch changes up to 00768a2bd3245eace0690fcf2c02776a256b66d7: > > perf trace: Print unresolved symbol names as addresses (2016-04-11 22:18:25 -0300) > > ---------------------------------------------------------------- > perf/core improvements: > > - Automagically create a 'bpf-output' event, easing the setup of BPF > C "scripts" that produce output via the perf ring buffer. Now it is > just a matter of calling any perf tool, such as 'trace', with a C > source file that references the __bpf_stdout__ output channel and > that channel will be created and connected to the script: > > # trace -e nanosleep --event test_bpf_stdout.c usleep 1 > 0.013 ( 0.013 ms): usleep/2818 nanosleep(rqtp: 0x7ffcead45f40 ) ... > 0.013 ( ): __bpf_stdout__:Raise a BPF event!..) > 0.015 ( ): perf_bpf_probe:func_begin:(ffffffff81112460)) > 0.261 ( ): __bpf_stdout__:Raise a BPF event!..) > 0.262 ( ): perf_bpf_probe:func_end:(ffffffff81112460 <- ffffffff81003d92)) > 0.264 ( 0.264 ms): usleep/2818 ... [continued]: nanosleep()) = 0 > # > > Further work is needed to reduce the number of lines in a perf bpf C source > file, this being the part where we greatly reduce the command line setup (Wang Nan) > > - 'perf trace' now supports callchains, with 'trace --call-graph dwarf' using > libunwind, just like 'perf top', to ask the kernel for stack dumps for CFI > processing. This reduces the overhead by asking just for userspace callchains > and also only for the syscall exit tracepoint (raw_syscalls:sys_exit) > (Milian Wolff, Arnaldo Carvalho de Melo) > > Try it with, for instance: > > # perf trace --call dwarf ping 127.0.0.1 > > An excerpt of a system wide 'perf trace --call dwarf" session is at: > > https://fedorapeople.org/~acme/perf/perf-trace--call-graph-dwarf--all-cpus.txt > > You may need to bump the number of mmap pages, using -m/--mmap-pages, > but on a Broadwell machine the defaults allowed system wide tracing to > work without losing that many records, experiment with just some > syscalls, like: > > # perf trace --call dwarf -e nanosleep,futex > > All the targets available for 'perf record', 'perf top' (--pid, --tid, --cpu, > etc) should work. Also --duration may be interesting to try. > > To get filenames from in various syscalls pointer args (open, ettc), add this > to the mix: > > # perf probe 'vfs_getname=getname_flags:72 pathname=filename:string' > > Making this work is next in line: > > # trace --call dwarf --ev sched:sched_switch/call-graph=fp/ usleep 1 > > I.e. honouring per-tracepoint callchains in 'perf trace' in addition to > in raw_syscalls:sys_exit. > > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com> > > ---------------------------------------------------------------- > Arnaldo Carvalho de Melo (15): > perf script: Use readdir() instead of deprecated readdir_r() > perf thread_map: Use readdir() instead of deprecated readdir_r() > perf tools: Use readdir() instead of deprecated readdir_r() > perf tools: Use readdir() instead of deprecated readdir_r() > perf dwarf: Guard !x86_64 definitions under #ifdef else clause > perf evsel: Allow passing a left alignment when printing a symbol > perf evsel: Rename print_ip() to fprintf_sym() > perf evsel: Introduce fprintf_callchain() method out of fprintf_sym() > perf trace: Exclude the kernel part of the callchain leading to a syscall > perf evsel: Do not use globals in config() > perf evlist: Add (reset,set)_sample_bit methods > perf evsel: Rename config_callgraph() to config_callchain() and make it public > perf trace: Make "--call-graph" affect just "raw_syscalls:sys_exit" > perf evsel: Allow unresolved symbol names to be printed as addresses > perf trace: Print unresolved symbol names as addresses > > Milian Wolff (2): > perf evsel: Allow specifying a file to output in perf_evsel__print_ip > perf trace: Add support for printing call chains on sys_exit events. > > Wang Nan (2): > perf bpf: Clone bpf stdout events in multiple bpf scripts > perf bpf: Automatically create bpf-output event __bpf_stdout__ > > tools/perf/Documentation/perf-trace.txt | 9 ++ > tools/perf/arch/x86/tests/perf-time-to-tsc.c | 2 +- > tools/perf/arch/x86/util/dwarf-regs.c | 8 +- > tools/perf/builtin-kvm.c | 2 +- > tools/perf/builtin-record.c | 10 +- > tools/perf/builtin-script.c | 78 +++++++-------- > tools/perf/builtin-top.c | 2 +- > tools/perf/builtin-trace.c | 65 +++++++++++- > tools/perf/tests/bpf.c | 2 +- > tools/perf/tests/code-reading.c | 2 +- > tools/perf/tests/keep-tracking.c | 2 +- > tools/perf/tests/openat-syscall-tp-fields.c | 2 +- > tools/perf/tests/perf-record.c | 2 +- > tools/perf/tests/switch-tracking.c | 2 +- > tools/perf/util/bpf-loader.c | 143 +++++++++++++++++++++++++++ > tools/perf/util/bpf-loader.h | 19 ++++ > tools/perf/util/event.c | 12 +-- > tools/perf/util/evlist.c | 18 ++++ > tools/perf/util/evlist.h | 16 ++- > tools/perf/util/evsel.c | 16 +-- > tools/perf/util/evsel.h | 14 ++- > tools/perf/util/parse-events.c | 60 +++++------ > tools/perf/util/record.c | 5 +- > tools/perf/util/session.c | 95 ++++++++++++------ > tools/perf/util/session.h | 8 +- > tools/perf/util/symbol.c | 25 ++++- > tools/perf/util/symbol.h | 6 ++ > tools/perf/util/thread_map.c | 8 +- > 28 files changed, 487 insertions(+), 146 deletions(-) Pulled, thanks a lot Arnaldo! Ingo
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