Re: [PATCH 00/35] perf intel-pt: Add support for tracing virtual machine user space on the host

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Mon, Jul 11, 2022 at 12:31:43PM +0300, Adrian Hunter escreveu:
> Hi
> 
> Here are patches to support decoding an Intel PT trace that contains data
> from virtual machine userspace.
> 
> This is done by adding functionality to perf inject to be able to inject
> sideband events needed for decoding, into the perf.data file recorded on
> the host.  That is, inject events from a perf.data file recorded in a
> virtual machine into a perf.data file recorded on the host at the same
> time.
> 
> For more details, see the example in the documentation added in the last
> patch.
> 
> Note there was already support for tracing virtual machines kernel-only:
> 
>  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Documentation/perf-intel-pt.txt?h=v5.19-rc1#n1221
>  
> or the special case of tracing KVM self tests:
> 
>  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Documentation/perf-intel-pt.txt?h=v5.19-rc1#n1403
> 
> For general information about Intel PT also see the wiki page:
> 
>  https://perf.wiki.kernel.org/index.php/Perf_tools_support_for_Intel%C2%AE_Processor_Trace
> 
> The patches fall into 5 groups:
>  1. the first patch is a fix
>  2. the next 22 patches are preparation
>  3. the main patch is "perf inject: Add support for injecting guest
>  sideband events"
>  4. 3 more preparation patches
>  5. Intel PT decoding changes
> 
> The patches are mostly small except for "perf inject: Add support for
> injecting guest sideband events".  However the code there adds new
> functionality, does not affect existing functionality and is consequently
> pretty self-contained.

Applied locally, going thru tests.

- Arnaldo
 
> 
> Adrian Hunter (35):
>       perf tools: Fix dso_id inode generation comparison
>       perf tools: Export dsos__for_each_with_build_id()
>       perf ordered_events: Add ordered_events__last_flush_time()
>       perf tools: Export perf_event__process_finished_round()
>       perf tools: Factor out evsel__id_hdr_size()
>       perf tools: Add perf_event__synthesize_id_sample()
>       perf script: Add --dump-unsorted-raw-trace option
>       perf buildid-cache: Add guestmount'd files to the build ID cache
>       perf buildid-cache: Do not require purge files to also be in the file system
>       perf tools: Add machine_pid and vcpu to id_index
>       perf session: Create guest machines from id_index
>       perf tools: Add guest_cpu to hypervisor threads
>       perf tools: Add machine_pid and vcpu to perf_sample
>       perf tools: Use sample->machine_pid to find guest machine
>       perf script: Add machine_pid and vcpu
>       perf dlfilter: Add machine_pid and vcpu
>       perf auxtrace: Add machine_pid and vcpu to auxtrace_error
>       perf script python: Add machine_pid and vcpu
>       perf script python: intel-pt-events: Add machine_pid and vcpu
>       perf tools: Remove also guest kcore_dir with host kcore_dir
>       perf tools: Make has_kcore_dir() work also for guest kcore_dir
>       perf tools: Automatically use guest kcore_dir if present
>       perf tools: Add reallocarray_as_needed()
>       perf inject: Add support for injecting guest sideband events
>       perf machine: Use realloc_array_as_needed() in machine__set_current_tid()
>       perf tools: Handle injected guest kernel mmap event
>       perf tools: Add perf_event__is_guest()
>       perf intel-pt: Remove guest_machine_pid
>       perf intel-pt: Add some more logging to intel_pt_walk_next_insn()
>       perf intel-pt: Track guest context switches
>       perf intel-pt: pt disable sync switch
>       perf intel-pt: Determine guest thread from guest sideband
>       perf intel-pt: Add machine_pid and vcpu to auxtrace_error
>       perf intel-pt: Use guest pid/tid etc in guest samples
>       perf intel-pt: Add documentation for tracing guest machine user space
> 
>  tools/lib/perf/include/internal/evsel.h            |    4 +
>  tools/lib/perf/include/perf/event.h                |    7 +
>  tools/perf/Documentation/perf-dlfilter.txt         |   22 +
>  tools/perf/Documentation/perf-inject.txt           |   17 +
>  tools/perf/Documentation/perf-intel-pt.txt         |  181 +++-
>  tools/perf/Documentation/perf-script.txt           |   10 +-
>  tools/perf/builtin-inject.c                        | 1043 +++++++++++++++++++-
>  tools/perf/builtin-script.c                        |   19 +
>  tools/perf/include/perf/perf_dlfilter.h            |    8 +
>  tools/perf/scripts/python/intel-pt-events.py       |   32 +-
>  tools/perf/util/auxtrace.c                         |   30 +-
>  tools/perf/util/auxtrace.h                         |    4 +
>  tools/perf/util/build-id.c                         |   80 +-
>  tools/perf/util/build-id.h                         |   16 +-
>  tools/perf/util/data.c                             |   43 +-
>  tools/perf/util/data.h                             |    1 +
>  tools/perf/util/dlfilter.c                         |    2 +
>  tools/perf/util/dso.h                              |    6 +
>  tools/perf/util/dsos.c                             |   10 +-
>  tools/perf/util/event.h                            |   23 +
>  tools/perf/util/evlist.c                           |   42 +-
>  tools/perf/util/evsel.c                            |   27 +
>  tools/perf/util/evsel.h                            |    2 +
>  tools/perf/util/intel-pt.c                         |  183 +++-
>  tools/perf/util/machine.c                          |   41 +-
>  tools/perf/util/machine.h                          |    2 +
>  tools/perf/util/ordered-events.h                   |    6 +
>  .../util/scripting-engines/trace-event-python.c    |   15 +-
>  tools/perf/util/session.c                          |  111 ++-
>  tools/perf/util/session.h                          |    4 +
>  tools/perf/util/symbol.c                           |    6 +-
>  tools/perf/util/synthetic-events.c                 |   98 +-
>  tools/perf/util/synthetic-events.h                 |    2 +
>  tools/perf/util/thread.c                           |    1 +
>  tools/perf/util/thread.h                           |    1 +
>  tools/perf/util/util.c                             |   70 +-
>  tools/perf/util/util.h                             |   15 +
>  37 files changed, 2029 insertions(+), 155 deletions(-)
> 
> 
> Regards
> Adrian

-- 

- Arnaldo