• Arnaldo Carvalho de Melo's avatar
    perf event: No need to create a thread when handling PERF_RECORD_EXIT · f62d3f0f
    Arnaldo Carvalho de Melo authored
    When we were processing a PERF_RECORD_EXIT event we first used
    machine__findnew_thread for both the thread exiting and for its parent,
    only to use just the thread struct associated with the one exiting, and
    to just delete it.
    
    If it existed, i.e. not created at this very moment in
    machine__findnew_thread, it will be moved to the machine->dead_threads
    linked list, because we may have hist_entries pointing to it, but if it
    was created just do be deleted, it will just sit there with no
    references at all.
    
    Use the new machine__find_thread() method so that if it is not there, we
    don't create it.
    
    As a bonus the parent thread will also not be created at this point.
    
    Create process_fork() and process_exit() helpers to use this and make
    the builtins use it instead of the generic process_task(), ditched by
    this patch.
    
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Namhyung Kim <namhyung@gmail.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Link: http://lkml.kernel.org/n/tip-z7n2y98ebjyrvmytaope4vdl@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    f62d3f0f
builtin-diff.c 15.7 KB