lkml.org 
[lkml]   [2012]   [Feb]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC] Extend mwait idle to optimize away IPIs when possible
From
Date
On Mon, 2012-02-06 at 12:42 -0800, Venkatesh Pallipadi wrote:
> smp_call_function_single and ttwu_queue_remote sends unconditional IPI
> to target CPU. However, if the target CPU is in mwait based idle, we can
> do IPI-less wakeups using the magical powers of monitor-mwait.

So I was thinking, why not change native_smp_send_reschedule() and
native_send_call_func_single_ipi() and keep the change entirely inside
the arch?

Ideally its only APIC/idle that know about this detail, the scheduler
(or other consumers) really don't care about how the other cpu comes to
run the callback.



\
 
 \ /
  Last update: 2012-02-10 20:21    [W:2.453 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site