lkml.org 
[lkml]   [2018]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC] perf: a different approach to perf_rotate_context()
From
Date
On 03.03.2018 20:48, Peter Zijlstra wrote:
> On Sat, Mar 03, 2018 at 04:43:16PM +0000, Song Liu wrote:
>>> In any case, there's a ton of conflict against the patches here:
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=perf/testing
>>>
>>> And with those the idea was to move to a virtual time based scheduler
>>> (basically schedule those flexible events that have the biggest lag --
>>> that also solves 1).
>>
>> Thanks for these information. I will study this approach. Maybe that is
>> our path to PMU sharing.
>
> So I'm really not convinced on that whole PMU sharing.
>
>> What's is the status of this work? Would it
>> land in 4.17?
>
> These patches might make 4.17, they got held up because of the whole
> meltdown/spectre crap and I need to get back to them.
>

That work is long desired and would bring performance boost, specifically on
server systems in per-process profiling mode, accompanied by good speedup on
context switches. Undoubtedly meltdown/spectre related activity
substituted it at some point but that improvements would still bring
significant value and is still awaited.

BR,
Alexey

\
 
 \ /
  Last update: 2018-03-05 12:32    [W:0.051 / U:0.788 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site