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Infrastructure:

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We were not handling POLLHUP notifications for event file descriptors.
 
 Fix it by filtering entries in the events file descriptor array after
 poll returns, refcounting mmaps so that when the last fd pointing to
 a perf mmap goes away we do the unmap.
 
 User visible:
 
 Now 'record' and 'trace' properly exit when a target thread exits.
 
 Arnaldo Carvalho de Melo (14):
   perf evlist: Introduce perf_evlist__filter_pollfd method
   perf tests: Add test for perf_evlist__filter_pollfd()
   perf evlist: Monitor POLLERR and POLLHUP events too
   perf evlist: We need to poll all event file descriptors
   perf evlist: Allow growing pollfd on add method
   perf tests: Add pollfd growing test
   perf kvm stat live: Use perf_evlist__add_pollfd() instead of local equivalent
   perf evlist: Introduce poll method for common code idiom
   tools lib api: Adopt fdarray class from perf's evlist
   perf evlist: Refcount mmaps
   tools lib fd array: Allow associating an integer cookie with each entry
   perf evlist: Unmap when all refcounts to fd are gone and events drained
   perf record: Filter out POLLHUP'ed file descriptors
   perf trace: Filter out POLLHUP'ed file descriptors
 
 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-fdarray-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf tooling updates from Arnaldo Carvalho de Melo.

Infrastructure changes:

  * We were not handling POLLHUP notifications for event file descriptors.

    Fix it by filtering entries in the events file descriptor array after
    poll() returns, refcounting mmaps so that when the last fd pointing to
    a perf mmap goes away we do the unmap. (Arnaldo Carvalho de Melo)

User visible changes:

  * Now 'record' and 'trace' properly exit when a target thread exits.
    (Arnaldo Carvalho de Melo)

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 2014-09-26 11:12:46 +02:00
commit cf8102f64c
17 changed files with 501 additions and 43 deletions
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