Re: [PATCH v2]: perf/core: addressing 4x slowdown during per-process, profiling of STREAM benchmark on Intel Xeon Phi

Alexey Budankov
2017-05-29T11:45:08Z

On 29.05.2017 14:23, Peter Zijlstra wrote:
> On Mon, May 29, 2017 at 01:56:05PM +0300, Alexey Budankov wrote:
>> On 29.05.2017 13:43, Peter Zijlstra wrote:
>
>>> Why can't the tree do both?
>>>
>>
>> Well, indeed, the tree provides such capability too. However switching to
>> the full tree iteration in cases where we now go through _groups lists will
>> enlarge the patch, what is probably is not a big deal. Do you think it is
>> worth implementing the switch?
>
> Do it as a series of patches, where patch 1 introduces the tree, patches
> 2 through n convert the list users into tree users, and patch n+1
> removes the list.

Well ok, let's do that additionally but please expect delay in delivery
(I am OOO till Jun 14).

>
> I think its good to not have duplicate data structures if we can avoid
> it.
>

yeah, makes sense.