[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] Ticket spinlocks and MP guests
>From: Keir Fraser >Sent: 2008年2月15日 16:23 > >On 15/2/08 01:03, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote: > >>> I suppose it depends whether there are any hot spinlocks in >>> the kernel these >>> days. I know things have improved a lot in recent years with >>> things like >>> RCU. Most spinlock regions are now pretty short. >>> >> >> The side effect is to enlarge average critical section length, if >> most spinlock regions are pretty short. > >Side effect of ticket-based locks, or pv'ed sleeping locks? > > -- Keir > Side effect about pv'ed sleeping locks, since originally maybe dozens of cycles are used to spin lock while pv'ed locks force hypercall to Xen and may even require owner with another unlock hypercall to notify back? Thanks, Kevin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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