xen/spinlock: Document the xen_nopvspin parameter.



Which disables in the ticketlock slowpath the Xen PV optimization's.
Useful for diagnosing issues and comparing benchmarks in
over-commit CPU scenarios.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

parent 0160676b

Documentation/kernel-parameters.txt

+4 −0

Original line number	Diff line number	Diff line
		@@ -3412,6 +3412,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
		the unplug protocol
		never -- do not unplug even if version check succeeds

		xen_nopvspin [X86,XEN]
		Disables the ticketlock slowpath using Xen PV
		optimizations.

		xirc2ps_cs= [NET,PCMCIA]
		Format:
		<irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]