[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC 2/2] x86, vdso, pvclock: Simplify and speed up the vdso pvclock reader
On 23/12/2014 16:14, Boris Ostrovsky wrote: >> + do { >> + version = pvti->version; >> + >> + /* This is also a read barrier, so we'll read version first. */ >> + rdtsc_barrier(); >> + tsc = __native_read_tsc(); > > > This will cause VMEXIT on Xen with TSC_MODE_ALWAYS_EMULATE which is > used, for example, after guest migrated (unless HW is capable of scaling > TSC rate). So does the __pvclock_read_cycles this is replacing (via pvclock_get_nsec_offset). Paolo _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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