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perf/core improvements and fixes:

Browse source 
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@redhat.com>
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Merge tag 'perf-core-for-mingo-20160530' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

User visible/kernel ABI changes:

- 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 changes:

- 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@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2016-05-31 09:24:10 +02:00
commit 42c4fb7747
27 changed files with 252 additions and 100 deletions
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