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SubjectRe: [PATCH 2/5] perf hists: Exchange order of comparing items when collapsing hists
On Fri, Dec 07, 2012 at 12:09:38AM +0900, Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@lge.com>
>
> When comparing entries for collapsing put the given entry first, and
> then the iterated entry. This is not the case of hist_entry__cmp()
> when called if given sort keys don't require collapsing. So change
> the order for the sake of consistency. It will be required for
> matching and/or linking multiple hist entries.

As discussed with Arnadlo, this change seems like changing the
sort order... could you ellaborate how it is usefull in future?

thanks,
jirka

>
> Cc: Jiri Olsa <jolsa@redhat.com>
> Cc: Stephane Eranian <eranian@google.com>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
> tools/perf/util/hist.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 82df1b26f0d4..d4471c21ed17 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -285,7 +285,7 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
> parent = *p;
> he = rb_entry(parent, struct hist_entry, rb_node_in);
>
> - cmp = hist_entry__cmp(entry, he);
> + cmp = hist_entry__cmp(he, entry);
>
> if (!cmp) {
> he_stat__add_period(&he->stat, period);
> @@ -729,7 +729,7 @@ static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
> parent = *p;
> he = rb_entry(parent, struct hist_entry, rb_node);
>
> - cmp = hist_entry__cmp(pair, he);
> + cmp = hist_entry__cmp(he, pair);
>
> if (!cmp)
> goto out;
> @@ -759,7 +759,7 @@ static struct hist_entry *hists__find_entry(struct hists *hists,
>
> while (n) {
> struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
> - int64_t cmp = hist_entry__cmp(he, iter);
> + int64_t cmp = hist_entry__cmp(iter, he);
>
> if (cmp < 0)
> n = n->rb_left;
> --
> 1.7.9.2
>


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