• Arnaldo Carvalho de Melo's avatar
    perf evsel: Cache associated event_format · fcf65bf1
    Arnaldo Carvalho de Melo authored
    We already lookup the associated event_format when reading the perf.data
    header, so that we can cache the tracepoint name in evsel->name, so do
    it a little further and save the event_format itself, so that we can
    avoid relookups in tools that need to access it.
    
    Change the tools to take the most obvious advantage, when they were
    using pevent_find_event directly. More work is needed for further
    removing the need of a pointer to pevent, such as when asking for event
    field values ("common_pid" and the other common fields and per
    event_format fields).
    
    This is something that was planned but only got actually done when
    Andrey Wagin needed to do this lookup at perf_tool->sample() time, when
    we don't have access to pevent (session->pevent) to use with
    pevent_find_event().
    
    Cc: Andrey Wagin <avagin@gmail.com>
    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>
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Link: http://lkml.kernel.org/n/tip-txkvew2ckko0b594ae8fbnyk@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    fcf65bf1
header.c 54.6 KB