On Thu, 6 Mar 2014, Kevin Easton wrote:
On Tue, Mar 04, 2014 at 04:51:15PM -0800, Andi Kleen wrote:
Anything else?
If it was possible to make the time remaining in the current timeslice
available to userspace through the vdso, the thread could do something like:
if (sys_timeleft() < CRITICAL_SECTION_SIZE)
yield();
lock();
to avoid running out of timeslice in the middle of the critical section.
but won't the system call result in context switches? According to Kevin, even a
context switch to another thread and back immediatly is bad enough to need to be
avoided, so replacing that with the context switch to the kernel and back isn't
a subtantial win.
David Lang
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