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SubjectRe: [PATCH v2 1/3] perf util: Move block_pair_cmp to block-info
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On 1/7/2020 5:57 PM, Jiri Olsa wrote:
> On Tue, Jan 07, 2020 at 03:45:23AM +0800, Jin Yao wrote:
>> block_pair_cmp() is a function which is used to compare
>> two blocks. Moving it from builtin-diff.c to block-info.c
>> to let it be used by other builtins.
>>
>> In block_pair_cmp, there is a minor change. It checks valid
>> for map, dso and sym first. If they are invalid, we will not
>> compare the address because the address might not make sense.
>
> please separate the change as well, it's hard to track
> what you did when the whole function is moved
>

Got it, thanks! I will separate this too.

>>
>> v2:
>> ---
>> New patch created in v2
>>
>> Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
>> ---
>> tools/perf/builtin-diff.c | 17 -----------------
>> tools/perf/util/block-info.c | 23 +++++++++++++++++++++++
>> tools/perf/util/block-info.h | 2 ++
>> 3 files changed, 25 insertions(+), 17 deletions(-)
>>
>> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
>> index f8b6ae557d8b..5ff1e21082cb 100644
>> --- a/tools/perf/builtin-diff.c
>> +++ b/tools/perf/builtin-diff.c
>> @@ -572,23 +572,6 @@ static void init_block_hist(struct block_hist *bh)
>> bh->valid = true;
>> }
>>
>> -static int block_pair_cmp(struct hist_entry *a, struct hist_entry *b)
>> -{
>> - struct block_info *bi_a = a->block_info;
>> - struct block_info *bi_b = b->block_info;
>> - int cmp;
>> -
>> - if (!bi_a->sym || !bi_b->sym)
>> - return -1;
>> -
>> - cmp = strcmp(bi_a->sym->name, bi_b->sym->name);
>> -
>> - if ((!cmp) && (bi_a->start == bi_b->start) && (bi_a->end == bi_b->end))
>> - return 0;
>> -
>> - return -1;
>> -}
>> -
>> static struct hist_entry *get_block_pair(struct hist_entry *he,
>> struct hists *hists_pair)
>> {
>> diff --git a/tools/perf/util/block-info.c b/tools/perf/util/block-info.c
>> index c4b030bf6ec2..18a445938681 100644
>> --- a/tools/perf/util/block-info.c
>> +++ b/tools/perf/util/block-info.c
>> @@ -475,3 +475,26 @@ float block_info__total_cycles_percent(struct hist_entry *he)
>>
>> return 0.0;
>> }
>> +
>> +int block_pair_cmp(struct hist_entry *pair, struct hist_entry *he)
>> +{
>> + struct block_info *bi_p = pair->block_info;
>> + struct block_info *bi_h = he->block_info;
>> + struct map_symbol *ms_p = &pair->ms;
>> + struct map_symbol *ms_h = &he->ms;
>> + int cmp;
>> +
>> + if (!ms_p->map || !ms_p->map->dso || !ms_p->sym ||
>> + !ms_h->map || !ms_h->map->dso || !ms_h->sym) {
>> + return -1;
>> + }
>> +
>> + cmp = strcmp(ms_p->sym->name, ms_h->sym->name);
>> + if (cmp)
>> + return -1;
>
> should this return cmp? also you don't mention this change in the changelog
>

Yes, return cmp should be OK.

It's changed from "strcmp(bi_a->sym->name, bi_b->sym->name)" to
"strcmp(ms_p->sym->name, ms_h->sym->name)" is because we don't need an
additional checking for bi_a->sym and bi_b->sym.

If we use "strcmp(bi_a->sym->name, bi_b->sym->name)" here, I think we'd
better check the sym first. I will mention that in changelog.

Thanks
Jin Yao

> thanks,
> jirka
>

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