Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning
From: Peter Zijlstra <peterz@infradead.org>
Date: 2009-01-08 19:23:29
Also in:
linux-fsdevel, lkml
Possibly related (same subject, not in this thread)
- 2009-01-12 · Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning · Ingo Molnar <hidden>
- 2009-01-12 · Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning · Jamie Lokier <hidden>
- 2009-01-11 · Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning · Linus Torvalds <torvalds@linux-foundation.org>
- 2009-01-11 · Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning · Andi Kleen <hidden>
- 2009-01-11 · Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning · David Woodhouse <dwmw2@infradead.org>
On Thu, 2009-01-08 at 11:13 -0800, Linus Torvalds wrote:
Well, at least we do unless you enable that broken paravirt support. I'm not at all clear on why CONFIG_PARAVIRT wants to use inferior locks, but I don't much care.
Because the virtual cpu that has the ticket might not get scheduled for a while, even though another vcpu with a spinner is scheduled. The whole (para)virt is a nightmare in that respect.