From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754666Ab0E1HDv (ORCPT ); Fri, 28 May 2010 03:03:51 -0400 Received: from vms173005pub.verizon.net ([206.46.173.5]:34402 "EHLO vms173005pub.verizon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754550Ab0E1HDp (ORCPT ); Fri, 28 May 2010 03:03:45 -0400 From: Len Brown To: linux-pm@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, Len Brown Subject: [PATCH 5/8] sched: clarify commment for TS_POLLING Date: Fri, 28 May 2010 02:01:58 -0400 Message-id: X-Mailer: git-send-email 1.7.1.231.gd0b16 In-reply-to: <1275026521-30835-1-git-send-email-lenb@kernel.org> References: <1275026521-30835-1-git-send-email-lenb@kernel.org> In-reply-to: <6b2c676bf32be91f43215d5874c07c1becaba013.1275026041.git.len.brown@intel.com> References: <6b2c676bf32be91f43215d5874c07c1becaba013.1275026041.git.len.brown@intel.com> X-Patchwork-Hint: ignore Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Len Brown TS_POLLING set tells the scheduler an idle_task will poll need_resched() to look for work. TS_POLLING clear tells resched_task() and wake_up_idle_cpu() that the remote CPU's idle_task is now sleeping in idle, and thus requires a reschedule interrupt notice work. Update the description of TS_POLLING to reflect how it works. "idle task polling need_resched, skip sending interrupt" Wordsmithing-by: Milton Miller Signed-off-by: Len Brown Acked-by: Peter Zijlstra --- arch/x86/include/asm/thread_info.h | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index e0d2890..8121869 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -241,8 +241,8 @@ static inline struct thread_info *current_thread_info(void) #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ -#define TS_POLLING 0x0004 /* true if in idle loop - and not sleeping */ +#define TS_POLLING 0x0004 /* idle task polling need_resched, + skip sending interrupt */ #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ #define TS_XSAVE 0x0010 /* Use xsave/xrstor */ -- 1.6.0.6