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| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-04-24 09:50:27 +0200 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-06-17 22:21:26 +0200 |
| commit | 16d9dbf0c2bd167fdd942b83592d59696c7b73bd (patch) | |
| tree | 8d650eb7a107e1e781d2612f9109fdbf923c5cc7 /arch | |
| parent | x86-32: make sure clts is batched during context switch (diff) | |
| download | linux-16d9dbf0c2bd167fdd942b83592d59696c7b73bd.tar.xz linux-16d9dbf0c2bd167fdd942b83592d59696c7b73bd.zip | |
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')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index ebefb5407b9d..c9b8904736db 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. */ |