lkml.org 
[lkml]   [2010]   [Aug]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [KVM timekeeping 11/35] Add helper functions for time computation
On 08/20/2010 07:34 AM, Glauber Costa wrote:
> On Thu, Aug 19, 2010 at 10:07:25PM -1000, Zachary Amsden wrote:
>
>> Add a helper function to compute the kernel time and convert nanoseconds
>> back to CPU specific cycles. Note that these must not be called in preemptible
>> context, as that would mean the kernel could enter software suspend state,
>> which would cause non-atomic operation.
>>
>> Also, convert the KVM_SET_CLOCK / KVM_GET_CLOCK ioctls to use the kernel
>> time helper, these should be bootbased as well.
>>
> This is one of the things I believe should be applied right now.
> Maybe we want a cut version of this patch, that exposes this API while
> adjusting KVM_SET_CLOCK / KVM_GET_CLOCK to get in early rather than late?
>

The first half of the series, at least, is good to go upstream and ready
for backport. The trapping and later stuff obviously needs to get some
upstream testing.


\
 
 \ /
  Last update: 2010-08-24 03:01    [W:0.081 / U:0.456 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site