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| author |   Suresh Siddha <suresh.b.siddha@intel.com> | 2008-03-10 15:28:04 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-04-19 19:19:55 +0200 |
| commit | 61c4628b538608c1a85211ed8438136adfeb9a95 (patch) | |
| tree | 290a695299a363153bc692e6d705ac680d64359e /arch/x86/kernel/process_64.c | |
| parent | x86: rename find_max_pfn() to propagate_e820_map() (diff) | |
| download | linux-dev-61c4628b538608c1a85211ed8438136adfeb9a95.tar.xz linux-dev-61c4628b538608c1a85211ed8438136adfeb9a95.zip | |
x86, fpu: split FPU state from task struct - v5
Split the FPU save area from the task struct. This allows easy migration
of FPU context, and it's generally cleaner. It also allows the following
two optimizations:
1) only allocate when the application actually uses FPU, so in the first
lazy FPU trap. This could save memory for non-fpu using apps. Next patch
does this lazy allocation.
2) allocate the right size for the actual cpu rather than 512 bytes always.
Patches enabling xsave/xrstor support (coming shortly) will take advantage
of this.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 4c13b1406c70..b795e831afd6 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -682,7 +682,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) /* we're going to use this soon, after a few expensive things */ if (next_p->fpu_counter>5) - prefetch(&next->i387.fxsave); + prefetch(next->xstate); /* * Reload esp0, LDT and the page table pointer: |