From aa283f49276e7d840a40fb01eee6de97eaa7e012 Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Mon, 10 Mar 2008 15:28:05 -0700 Subject: 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 Cc: Arjan van de Ven Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/asm-x86/i387.h | 2 +- include/asm-x86/processor.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) (limited to 'include') 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; -- cgit v1.2.3