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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-04-24 00:50:27 -0700
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-06-17 13:21:26 -0700
commit16d9dbf0c2bd167fdd942b83592d59696c7b73bd (patch)
tree8d650eb7a107e1e781d2612f9109fdbf923c5cc7 /arch/x86
parent2fcddce10f6771cfa0c56fd1e826d50d67d100b7 (diff)
x86-64: move unlazy_fpu() into lazy cpu state part of context switch
Make sure that unlazy_fpu()'s stts gets batched along with the other cpu state changes during context switch. (32-bit already does this.) This makes sure it gets batched when running paravirtualized. [ 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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/process_64.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index ebefb5407b9..c9b8904736d 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -419,6 +419,9 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
load_TLS(next, cpu);
+ /* Must be after DS reload */
+ unlazy_fpu(prev_p);
+
/*
* Leave lazy mode, flushing any hypercalls made here.
* This must be done before restoring TLS segments so
@@ -459,9 +462,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
wrmsrl(MSR_KERNEL_GS_BASE, next->gs);
prev->gsindex = gsindex;
- /* Must be after DS reload */
- unlazy_fpu(prev_p);
-
/*
* Switch the PDA and FPU contexts.
*/