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    perf hist: Introduce hists class and move lots of methods to it · 1c02c4d2
    Arnaldo Carvalho de Melo 提交于
    In cbbc79a5 we introduced support for multiple events by introducing a
    new "event_stat_id" struct and then made several perf_session methods
    receive a point to it instead of a pointer to perf_session, and kept the
    event_stats and hists rb_tree in perf_session.
    
    While working on the new newt based browser, I realised that it would be
    better to introduce a new class, "hists" (short for "histograms"),
    renaming the "event_stat_id" struct and the perf_session methods that
    were really "hists" methods, as they manipulate only struct hists
    members, not touching anything in the other perf_session members.
    
    Other optimizations, such as calculating the maximum lenght of a symbol
    name present in an hists instance will be possible as we add them,
    avoiding a re-traversal just for finding that information.
    
    The rationale for the name "hists" to replace "event_stat_id" is that we
    may have multiple sets of hists for the same event_stat id, as, for
    instance, the 'perf diff' tool has, so event stat id is not what
    characterizes what this struct and the functions that manipulate it do.
    
    Cc: Eric B Munson <ebmunson@us.ibm.com>
    Cc: Frédéric Weisbecker <fweisbec@gmail.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Tom Zanussi <tzanussi@gmail.com>
    LKML-Reference: <new-submission>
    Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
    1c02c4d2
builtin-trace.c 15.0 KB