• Ingo Molnar's avatar
    perf: Do the big rename: Performance Counters -> Performance Events · cdd6c482
    Ingo Molnar authored
    
    
    Bye-bye Performance Counters, welcome Performance Events!
    
    In the past few months the perfcounters subsystem has grown out its
    initial role of counting hardware events, and has become (and is
    becoming) a much broader generic event enumeration, reporting, logging,
    monitoring, analysis facility.
    
    Naming its core object 'perf_counter' and naming the subsystem
    'perfcounters' has become more and more of a misnomer. With pending
    code like hw-breakpoints support the 'counter' name is less and
    less appropriate.
    
    All in one, we've decided to rename the subsystem to 'performance
    events' and to propagate this rename through all fields, variables
    and API names. (in an ABI compatible fashion)
    
    The word 'event' is also a bit shorter than 'counter' - which makes
    it slightly more convenient to write/handle as well.
    
    Thanks goes to Stephane Eranian who first observed this misnomer and
    suggested a rename.
    
    User-space tooling and ABI compatibility is not affected - this patch
    should be function-invariant. (Also, defconfigs were not touched to
    keep the size down.)
    
    This patch has been generated via the following script:
    
      FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')
    
      sed -i \
        -e 's/PERF_EVENT_/PERF_RECORD_/g' \
        -e 's/PERF_COUNTER/PERF_EVENT/g' \
        -e 's/perf_counter/perf_event/g' \
        -e 's/nb_counters/nb_events/g' \
        -e 's/swcounter/swevent/g' \
        -e 's/tpcounter_event/tp_event/g' \
        $FILES
    
      for N in $(find . -name perf_counter.[ch]); do
        M=$(echo $N | sed 's/perf_counter/perf_event/g')
        mv $N $M
      done
    
      FILES=$(find . -name perf_event.*)
    
      sed -i \
        -e 's/COUNTER_MASK/REG_MASK/g' \
        -e 's/COUNTER/EVENT/g' \
        -e 's/\<event\>/event_id/g' \
        -e 's/counter/event/g' \
        -e 's/Counter/Event/g' \
        $FILES
    
    ... to keep it as correct as possible. This script can also be
    used by anyone who has pending perfcounters patches - it converts
    a Linux kernel tree over to the new naming. We tried to time this
    change to the point in time where the amount of pending patches
    is the smallest: the end of the merge window.
    
    Namespace clashes were fixed up in a preparatory patch - and some
    stylistic fallout will be fixed up in a subsequent patch.
    
    ( NOTE: 'counters' are still the proper terminology when we deal
      with hardware registers - and these sed scripts are a bit
      over-eager in renaming them. I've undone some of that, but
      in case there's something left where 'counter' would be
      better than 'event' we can undo that on an individual basis
      instead of touching an otherwise nicely automated patch. )
    Suggested-by: default avatarStephane Eranian <eranian@google.com>
    Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
    Acked-by: default avatarPaul Mackerras <paulus@samba.org>
    Reviewed-by: default avatarArjan van de Ven <arjan@linux.intel.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: David Howells <dhowells@redhat.com>
    Cc: Kyle McMartin <kyle@mcmartin.ca>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: <linux-arch@vger.kernel.org>
    LKML-Reference: <new-submission>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    cdd6c482