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SubjectRe: [PATCH] perf annotate: Remove hist__account_cycles from callback
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Any comments for this patch or any issue is found? In testing, I just 
feel it accelerates the perf annotate data processing.

Thanks
Jin Yao

On 3/13/2019 4:22 AM, Jin Yao wrote:
> The hist__account_cycles is executed when the hist_iter__branch_callback
> is called. But it looks it's not necessary. In hist__account_cycles, it
> already walks on all branch entries.
>
> This patch moves the hist__account_cycles out of callback, now the data
> processing is much faster than before.
>
> For example,
> perf record -b ...
> perf annotate
>
> The before/after output should be no change.
>
> Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
> ---
> tools/perf/builtin-annotate.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> index 67f9d9f..77deb3a 100644
> --- a/tools/perf/builtin-annotate.c
> +++ b/tools/perf/builtin-annotate.c
> @@ -159,8 +159,6 @@ static int hist_iter__branch_callback(struct hist_entry_iter *iter,
> struct perf_evsel *evsel = iter->evsel;
> int err;
>
> - hist__account_cycles(sample->branch_stack, al, sample, false);
> -
> bi = he->branch_info;
> err = addr_map_symbol__inc_samples(&bi->from, sample, evsel);
>
> @@ -199,6 +197,8 @@ static int process_branch_callback(struct perf_evsel *evsel,
> if (a.map != NULL)
> a.map->dso->hit = 1;
>
> + hist__account_cycles(sample->branch_stack, al, sample, false);
> +
> ret = hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
> return ret;
> }
>

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