On 04/13/2016 07:15 AM, Pan Xinhui wrote:
Hello Peter,
On 2016年04月12日 22:30, Peter Zijlstra wrote:
I am working on the qspinlock implementation on PPC.
Your and Waiman's patches are so nice. :)
Thanks!, last time I looked at PPC spinlocks they could not use things
like ticket locks because PPC might be a guest and fairness blows etc..
You're making the qspinlock-paravirt thing work on PPC, or doing
qspinlock only for bare-metal PPC?
I am making the both work. :)
qspinlock works on PPC now. I am preparing the patches and will send them out
in next weeks :)
What of performance improvement are you seeing in PPC?
The paravirt work is a little hard.
currently, there are pv_wait() and pv_kick(). but only pv_kick has the
parameter cpu(who will hold the lock as soon as the lock is unlocked).
We need parameter cpu(who holds the lock now) in pv_wait,too.
That can be doable to a certain extent. However, if the current lock
holder acquired the lock via the fastpath only. The CPU information is
not logged anywhere. For a contended lock, the information should be there.
Cheers,
Longman
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