[lkml]   [2010]   [Nov]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC PATCH 2/3 v2] perf: Implement Nehalem uncore pmu
> Yep, I see no reason to dis-allow sampling. Sure its hard to make sense
> of it, but since there are people who offline all but one cpu of a
> package,

Assuming they don't have any active PCI devices either.

> I bet there are people who will run just one task on a package
> as well.

In that case the sampling has a 1/NUM-CPU-THREADS-IN-PACKAGE chance
to report the right task (or actually somewhat less because the measurement
skew for uncore is much higher than for normal events)

Really for per core measurements using the OFFCORE events is much better.

-- -- Speaking for myself only.

 \ /
  Last update: 2010-11-25 19:23    [W:0.256 / U:0.844 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site