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SubjectRe: [PATCH v7 0/2] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi
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Hi,
On 22.08.2017 23:21, Peter Zijlstra wrote:
> On Fri, Aug 18, 2017 at 08:17:15AM +0300, Alexey Budankov wrote:
>> Hi,
>
> Please don't post new versions in reply to old versions, that gets them
> lost in thread sorted views.
>
>> This patch set v7 moves event groups into rb trees and implements
>> skipping to the current CPU's list on hrtimer interrupt.
>
> Does this depend on your timekeeping rework posted in that v6 thread?
> If so, I would have expected to see that as part of these patches, if
> not, I'm confused, because part of the problem was that we currently
> need to update times for events we don't want to schedule etc..
>
>> Events allocated for the same CPU are still kept in a linked list
>> of the event directly attached to the tree because it is unclear
>> how to implement fast iteration thru events allocated for
>> the same CPU when they are all attached to a tree employing
>> additional 64bit index as a secondary treee key.
>
> Finding the CPU subtree and rb_next() wasn't good?

I eventually managed to overcome difficulties with implementation
of rb_tree indexed by {cpu,index} for event groups so please
see patches v9.

>
>
>

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