svn commit: r282571 - head/sys/amd64/include
Neel Natu
neel at FreeBSD.org
Wed May 6 23:40:25 UTC 2015
Author: neel
Date: Wed May 6 23:40:24 2015
New Revision: 282571
URL: https://svnweb.freebsd.org/changeset/base/282571
Log:
Check 'td_owepreempt' and yield the vcpu thread if it is set.
This is done explicitly because a vcpu thread can be in a critical section
for the entire time slice alloted to it. This in turn can delay the handling
of the 'td_owepreempt'.
Reviewed by: jhb
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D2430
Modified:
head/sys/amd64/include/vmm.h
Modified: head/sys/amd64/include/vmm.h
==============================================================================
--- head/sys/amd64/include/vmm.h Wed May 6 23:26:51 2015 (r282570)
+++ head/sys/amd64/include/vmm.h Wed May 6 23:40:24 2015 (r282571)
@@ -276,7 +276,13 @@ vcpu_is_running(struct vm *vm, int vcpu,
static int __inline
vcpu_should_yield(struct vm *vm, int vcpu)
{
- return (curthread->td_flags & (TDF_ASTPENDING | TDF_NEEDRESCHED));
+
+ if (curthread->td_flags & (TDF_ASTPENDING | TDF_NEEDRESCHED))
+ return (1);
+ else if (curthread->td_owepreempt)
+ return (1);
+ else
+ return (0);
}
#endif
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