[PATCH v3 -tip 0/4] tracing: make a snapshot feature available from userspace

[Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>]

Hi, Steven,

Thank you for your review.
I applied your review comments.

These patches depend on the next patch.

tracing: Add a resize function to make one buffer equivalent to another buffer
http://lkml.kernel.org/r/20121017025616.2627.91226.stgit@falsita

v2->v3:
 [1/4] tracing: add checks if tr->buffer is NULL in tracing_reset{_online_cpus}
        - (new patch)
 [2/4] tracing: replace static old_tracer with strcmp
        - (new patch)
 [3/4] tracing: make a snapshot feature available from userspace
        - changed snapshot file I/F (removed "snapshot_allocate")
        - changed CONFIG_TRACER_SNAPSHOT's location and description
        - changed an integer flag of __tracing_open() to bool
        - switched to use seq_read() directly for reading snapshot
 [4/4] tracing: add description of snapshot to Documentation/trace/ftrace.txt
        - updated documentation of the snapshot

ToDo:
 - adding "trace_snapshot" kernel parameter to allocate spare buffer on boot. 

(v1: https://lkml.org/lkml/2012/10/2/67)
(v2: https://lkml.org/lkml/2012/10/16/585)

---

Hiraku Toyooka (4):
      tracing: add checks if tr->buffer is NULL in tracing_reset{_online_cpus}
      tracing: replace static old_tracer with strcmp
      tracing: make a snapshot feature available from userspace
      tracing: add description of snapshot to Documentation/trace/ftrace.txt


 Documentation/trace/ftrace.txt |   83 +++++++++++++++++++++
 include/linux/ftrace_event.h   |    3 +
 kernel/trace/Kconfig           |   10 +++
 kernel/trace/trace.c           |  158 ++++++++++++++++++++++++++++++++++------
 kernel/trace/trace.h           |    1 
 5 files changed, 231 insertions(+), 24 deletions(-)

-- 
Hiraku TOYOOKA
Linux Technology Center
Yokohama Research Laboratory
Hitachi Ltd.