Commit-ID: 04075425331f91f7176a34232c21b63af0eafc53 Gitweb: http://git.kernel.org/tip/04075425331f91f7176a34232c21b63af0eafc53 Author: Peter Zijlstra <pet...@infradead.org> AuthorDate: Fri, 11 Apr 2014 09:59:08 +0200 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Thu, 8 May 2014 09:16:55 +0200
sched/idle, ia64: Switch from TS_POLLING to TIF_POLLING_NRFLAG Standardize the idle polling indicator to TIF_POLLING_NRFLAG such that both TIF_NEED_RESCHED and TIF_POLLING_NRFLAG are in the same word. This will allow us, using fetch_or(), to both set NEED_RESCHED and check for POLLING_NRFLAG in a single operation and avoid pointless wakeups. Changing from the non-atomic thread_info::status flags to the atomic thread_info::flags shouldn't be a big issue since most polling state changes were followed/preceded by a full memory barrier anyway. Signed-off-by: Peter Zijlstra <pet...@infradead.org> Cc: Fenghua Yu <fenghua...@intel.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Tony Luck <tony.l...@intel.com> Cc: Andy Lutomirski <l...@amacapital.net> Cc: linux-i...@vger.kernel.org Link: http://lkml.kernel.org/n/tip-6633akuird5hi3si4gbeg...@git.kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/ia64/include/asm/thread_info.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h index 5957cf6..5b17418 100644 --- a/arch/ia64/include/asm/thread_info.h +++ b/arch/ia64/include/asm/thread_info.h @@ -107,6 +107,7 @@ struct thread_info { #define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */ #define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */ #define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */ +#define TIF_POLLING_NRFLAG 22 /* idle is polling for TIF_NEED_RESCHED */ #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) @@ -118,6 +119,7 @@ struct thread_info { #define _TIF_MCA_INIT (1 << TIF_MCA_INIT) #define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED) #define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE) +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) /* "work to do on user-return" bits */ #define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\ @@ -125,7 +127,6 @@ 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 TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */ #ifndef __ASSEMBLY__ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
