lkml.org 
[lkml]   [2018]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] kvm: rename HINTS_DEDICATED to KVM_HINTS_REALTIME
From
Date
On 18/05/2018 18:04, Eduardo Habkost wrote:
>> Without mlock you should always use pv spinlocks.
>>
>> Otherwise you risk blocking on a lock taken by
>> a VCPU that is in turn blocked on IO, where the IO
>> is not completing because CPU is being used up
>> spinning.
>
> So the stronger guarantee seems necessary.
>
> Now what should host userspace do if the user is trying to run an
> existing configuration where the CPUID hint was set but memory is
> not pinned?

As mentioned elsewhere in the thread, there are many ways to pin memory,
and mlock is not always necessary. However, I agree with Michael in
making the hint provide a stronger guarantee.

Paolo

\
 
 \ /
  Last update: 2018-05-18 19:18    [W:0.046 / U:11.588 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site