diff options
| author | Suresh Siddha | 2008-03-10 23:28:05 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2008-04-19 19:19:55 +0200 |
| commit | aa283f49276e7d840a40fb01eee6de97eaa7e012 (patch) | |
| tree | b17b134b174666e482b1a8ad486436a3d5cdb83e /include | |
| parent | x86, fpu: split FPU state from task struct - v5 (diff) | |
| download | kernel-qcow2-linux-aa283f49276e7d840a40fb01eee6de97eaa7e012.tar.gz kernel-qcow2-linux-aa283f49276e7d840a40fb01eee6de97eaa7e012.tar.xz kernel-qcow2-linux-aa283f49276e7d840a40fb01eee6de97eaa7e012.zip | |
x86, fpu: lazy allocation of FPU area - v5
Only allocate the FPU area when the application actually uses FPU, i.e., in the
first lazy FPU trap. This could save memory for non-fpu using apps.
for example: on my system after boot, there are around 300 processes, with
only 17 using FPU.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: 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 'include')
| -rw-r--r-- | include/asm-x86/i387.h | 2 | ||||
| -rw-r--r-- | include/asm-x86/processor.h | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/include/asm-x86/i387.h b/include/asm-x86/i387.h index 382a5fa9d492..4be7b58b1e16 100644 --- a/include/asm-x86/i387.h +++ b/include/asm-x86/i387.h @@ -21,7 +21,7 @@ extern void fpu_init(void); extern void mxcsr_feature_mask_init(void); -extern void init_fpu(struct task_struct *child); +extern int init_fpu(struct task_struct *child); extern asmlinkage void math_state_restore(void); extern void init_thread_xstate(void); diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h index 99d297885780..e6bf92ddeb21 100644 --- a/include/asm-x86/processor.h +++ b/include/asm-x86/processor.h @@ -366,6 +366,8 @@ DECLARE_PER_CPU(struct orig_ist, orig_ist); extern void print_cpu_info(struct cpuinfo_x86 *); extern unsigned int xstate_size; +extern void free_thread_xstate(struct task_struct *); +extern struct kmem_cache *task_xstate_cachep; extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c); extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); extern unsigned short num_cache_leaves; |