x86-32: make sure clts is batched during context switch

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If we're preloading the fpu state during context switch, make sure the clts
happens while we're batching the cpu context update, then do the actual
__math_state_restore once the updates are flushed.

This allows more efficient context switches when running paravirtualized,
as all the hypercalls can be folded together into one.

[ Impact: optimise paravirtual FPU context switch ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>

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Jeremy Fitzhardinge 2009-04-24 00:45:26 -07:00

parent e6e9cac8c3

commit 2fcddce10f

1 changed files with 16 additions and 11 deletions

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arch/x86/kernel/process_32.c

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