From 495ab9c045e1b0e5c82951b762257fe1c9d81564 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Mon, 26 Jun 2006 13:59:11 +0200 Subject: [PATCH] i386/x86-64/ia64: Move polling flag into thread_info_status During some profiling I noticed that default_idle causes a lot of memory traffic. I think that is caused by the atomic operations to clear/set the polling flag in thread_info. There is actually no reason to make this atomic - only the idle thread does it to itself, other CPUs only read it. So I moved it into ti->status. Converted i386/x86-64/ia64 for now because that was the easiest way to fix ACPI which also manipulates these flags in its idle function. Cc: Nick Piggin Cc: Tony Luck Cc: Len Brown Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-ia64/thread_info.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/asm-ia64') diff --git a/include/asm-ia64/thread_info.h b/include/asm-ia64/thread_info.h index e5392c4d30c6..8bc9869e5765 100644 --- a/include/asm-ia64/thread_info.h +++ b/include/asm-ia64/thread_info.h @@ -27,6 +27,7 @@ struct thread_info { __u32 flags; /* thread_info flags (see TIF_*) */ __u32 cpu; /* current CPU */ __u32 last_cpu; /* Last CPU thread ran on */ + __u32 status; /* Thread synchronous flags */ mm_segment_t addr_limit; /* user-level address space limit */ int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */ struct restart_block restart_block; @@ -103,4 +104,8 @@ struct thread_info { /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */ #define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)) +#define TS_POLLING 1 /* true if in idle loop and not sleeping */ + +#define tsk_is_polling(t) ((t)->thread_info->status & TS_POLLING) + #endif /* _ASM_IA64_THREAD_INFO_H */ -- cgit v1.2.2