[lkml]   [2008]   [Dec]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    Subject[PATCH 0/3] ftrace: updates for tip

    This series has three patches.

    The first patch adds a new feature that I've been wanting to have for some
    time and Arjan even requested. That is to pick a function and only
    trace that function and its children. Dynamic ftrace and function
    graph needs to be enabled for this.

    To do the above, I added a "trace" flags field in the task structure.
    The second patch uses this for the ftrace pid code. It searches for
    the task based on the pid and sets the trace flag, then in the
    ftrace function caller it only needs to check this flag.

    This means we can now trace more than one pid without any more overhead.
    It also means that we should be able to use the name space code that
    the container guys want us to. But since I'm not very up on the
    namespace code, I'm still using just the normal 'pid'. I've Cc'd the
    container folks so perhaps they could write up a patch for me ;-)

    Note: When writing to the set_ftrace_pid two things happen.
    - The task with the matching pid gets the trace flag set.
    - Any other task has its trace flag cleared.
    #2 needs to be addressed when converting to pid name spaces.
    Just because it is not enough to simply find the matching task.
    It may be good enough to just clear all tasks and then find the
    one that matches.

    The last patch makes the function graph tracer honor the set_ftrace_pid.

    The following patches are in:


    branch: tip/devel

    Steven Rostedt (3):
    ftrace: graph of a single function
    ftrace: use task struct trace flag to filter on pid
    ftrace: trace single pid for function graph tracer

    include/linux/ftrace.h | 46 +++++++++
    include/linux/sched.h | 4 +
    kernel/trace/ftrace.c | 257 +++++++++++++++++++++++++++++++++++++++++++++++-
    kernel/trace/trace.c | 11 ++
    kernel/trace/trace.h | 40 +++++++-
    5 files changed, 353 insertions(+), 5 deletions(-)

     \ /
      Last update: 2008-12-03 21:47    [W:0.039 / U:0.056 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site