From 616c05d110bb4ef8203f49c9d2476874077c2f6a Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Tue, 12 Nov 2013 15:08:45 -0800 Subject: sh: move fpu_counter into ARCH specific thread_struct Only a couple of arches (sh/x86) use fpu_counter in task_struct so it can be moved out into ARCH specific thread_struct, reducing the size of task_struct for other arches. Compile tested sh defconfig + sh4-linux-gcc (4.6.3) Signed-off-by: Vineet Gupta Cc: Paul Mundt Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/sh/include/asm/fpu.h | 2 +- arch/sh/include/asm/processor_32.h | 10 ++++++++++ arch/sh/include/asm/processor_64.h | 10 ++++++++++ 3 files changed, 21 insertions(+), 1 deletion(-) (limited to 'arch/sh/include') diff --git a/arch/sh/include/asm/fpu.h b/arch/sh/include/asm/fpu.h index 06c4281..09fc2bc 100644 --- a/arch/sh/include/asm/fpu.h +++ b/arch/sh/include/asm/fpu.h @@ -46,7 +46,7 @@ static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs) save_fpu(tsk); release_fpu(regs); } else - tsk->fpu_counter = 0; + tsk->thread.fpu_counter = 0; } static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs) diff --git a/arch/sh/include/asm/processor_32.h b/arch/sh/include/asm/processor_32.h index e699a12..18e0377 100644 --- a/arch/sh/include/asm/processor_32.h +++ b/arch/sh/include/asm/processor_32.h @@ -111,6 +111,16 @@ struct thread_struct { /* Extended processor state */ union thread_xstate *xstate; + + /* + * fpu_counter contains the number of consecutive context switches + * that the FPU is used. If this is over a threshold, the lazy fpu + * saving becomes unlazy to save the trap. This is an unsigned char + * so that after 256 times the counter wraps and the behavior turns + * lazy again; this to deal with bursty apps that only use FPU for + * a short time + */ + unsigned char fpu_counter; }; #define INIT_THREAD { \ diff --git a/arch/sh/include/asm/processor_64.h b/arch/sh/include/asm/processor_64.h index 1cc7d31..eedd4f6 100644 --- a/arch/sh/include/asm/processor_64.h +++ b/arch/sh/include/asm/processor_64.h @@ -126,6 +126,16 @@ struct thread_struct { /* floating point info */ union thread_xstate *xstate; + + /* + * fpu_counter contains the number of consecutive context switches + * that the FPU is used. If this is over a threshold, the lazy fpu + * saving becomes unlazy to save the trap. This is an unsigned char + * so that after 256 times the counter wraps and the behavior turns + * lazy again; this to deal with bursty apps that only use FPU for + * a short time + */ + unsigned char fpu_counter; }; #define INIT_MMAP \ -- cgit v1.1