Re: [GIT PULL 00/12] perf/core improvements and fixes

[Ingo Molnar]

* Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:

> Hi Ingo,
> 
> 	Please consider pulling,
> 
> - Arnaldo
> 
> The following changes since commit 711460514b1c80494f14001bdf30dd70fd401a8f:
> 
>   Merge tag 'perf-urgent-for-mingo-20160527' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent (2016-05-29 20:15:37 +0200)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo-20160530
> 
> for you to fetch changes up to 01412261d99497021353c4b1d67e8df6c9cdc3c6:
> 
>   perf buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid (2016-05-30 13:15:03 -0300)
> 
> ----------------------------------------------------------------
> perf/core improvements and fixes:
> 
> User visible/kernel ABI:
> 
> - Per event callchain limit: Recently we introduced a sysctl to tune the
>   max-stack for all events for which callchains were requested:
> 
>   $ sysctl kernel.perf_event_max_stack
>   kernel.perf_event_max_stack = 127
> 
>   Now this patch introduces a way to configure this per event, i.e. this
>   becomes possible:
> 
>   $ perf record -e sched:*/max-stack=2/ -e block:*/max-stack=10/ -a
> 
>   allowing finer tuning of how much buffer space callchains use.
> 
>   This uses an u16 from the reserved space at the end, leaving another
>   u16 for future use.
> 
>   There has been interest in even finer tuning, namely to control the
>   max stack for kernel and userspace callchains separately. Further
>   discussion is needed, we may for instance use the remaining u16 for
>   that and when it is present, assume that the sample_max_stack introduced
>   in this patch applies for the kernel, and the u16 left is used for
>   limiting the userspace callchain. (Arnaldo Carvalho de Melo)
> 
> Infrastructure:
> 
> - Adopt get_main_thread from db-export.c (Andi Kleen)
> 
> - More prep work for backward ring buffer support (Wang Nan)
> 
> - Prep work for supporting SDT (Statically Defined Tracing)
>   tracepoints (Masami Hiramatsu)
> 
> - Add arch/*/include/generated/ to .gitignore (Taeung Song)
> 
> Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> 
> ----------------------------------------------------------------
> Andi Kleen (1):
>       perf thread: Adopt get_main_thread from db-export.c
> 
> Arnaldo Carvalho de Melo (2):
>       perf core: Per event callchain limit
>       perf tools: Per event max-stack settings
> 
> Masami Hiramatsu (3):
>       perf symbols: Introduce filename__readable to check readability
>       perf symbols: Cleanup the code flow of dso__find_kallsyms
>       perf buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid
> 
> Taeung Song (1):
>       perf tools: Add arch/*/include/generated/ to .gitignore
> 
> Wang Nan (5):
>       perf record: Robustify perf_event__synth_time_conv()
>       perf evlist: Don't poll and mmap overwritable events
>       perf evlist: Check 'base' pointer before checking refcnt when put a mmap
>       perf evlist: Choose correct reading direction according to evlist->backward
>       tools: Pass arg to fdarray__filter's call back function
> 
>  include/linux/perf_event.h      |   2 +-
>  include/uapi/linux/perf_event.h |   6 ++-
>  kernel/bpf/stackmap.c           |   2 +-
>  kernel/events/callchain.c       |  14 ++++-
>  kernel/events/core.c            |   5 +-
>  tools/lib/api/fd/array.c        |   5 +-
>  tools/lib/api/fd/array.h        |   3 +-
>  tools/perf/.gitignore           |   1 +
>  tools/perf/arch/x86/util/tsc.c  |   2 +
>  tools/perf/builtin-record.c     |   9 +++-
>  tools/perf/tests/fdarray.c      |   8 +--
>  tools/perf/util/build-id.c      | 115 ++++++++++++++++++++++++++++++----------
>  tools/perf/util/build-id.h      |   2 +
>  tools/perf/util/callchain.h     |   1 +
>  tools/perf/util/db-export.c     |  13 +----
>  tools/perf/util/dso.h           |   5 ++
>  tools/perf/util/evlist.c        |  43 +++++++++++----
>  tools/perf/util/evlist.h        |   2 +
>  tools/perf/util/evsel.c         |  16 +++++-
>  tools/perf/util/evsel.h         |   2 +
>  tools/perf/util/parse-events.c  |   8 +++
>  tools/perf/util/parse-events.h  |   1 +
>  tools/perf/util/parse-events.l  |   1 +
>  tools/perf/util/session.c       |   2 +
>  tools/perf/util/symbol.c        |  71 ++++++++++++-------------
>  tools/perf/util/thread.c        |  11 ++++
>  tools/perf/util/thread.h        |   2 +
>  27 files changed, 252 insertions(+), 100 deletions(-)

Pulled, thanks a lot Arnaldo!

	Ingo