[lkml]   [2017]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] x86: use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz" again
On Thu, Nov 9, 2017 at 2:30 PM, Rafael J. Wysocki <> wrote:
> c_start() can run aperfmperf_snapshot_khz() on all CPUs upfront (say
> in parallel), then wait for a while (say 5 ms; the current 20 ms wait
> is overkill) and then aperfmperf_snapshot_khz() can be run once on
> each CPU in show_cpuinfo() without taking the "stale cache" threshold
> into account.

Yeah, that won't work.

What could work is to do that "smp_call_function_many()" at open time,
and *not* set the "wait" flag, but do it entirely asynchronously.

But I don't think that's an option for 4.14 ;(

So I guess I'll have to revert.


 \ /
  Last update: 2017-11-10 20:12    [W:0.134 / U:1.692 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site