Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755224AbXJWRI7 (ORCPT ); Tue, 23 Oct 2007 13:08:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754810AbXJWRF4 (ORCPT ); Tue, 23 Oct 2007 13:05:56 -0400 Received: from 75-130-111-13.dhcp.oxfr.ma.charter.com ([75.130.111.13]:35109 "EHLO novell1.haskins.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754803AbXJWRFz (ORCPT ); Tue, 23 Oct 2007 13:05:55 -0400 From: Gregory Haskins Subject: [PATCH 11/13] RT: Condense NORMAL and IDLE priorities To: linux-rt-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Gregory Haskins , Steven Rostedt , Dmitry Adamushko , Peter Zijlstra , Ingo Molnar , Darren Hart Date: Tue, 23 Oct 2007 12:51:19 -0400 Message-ID: <20071023165119.5536.8213.stgit@novell1.haskins.net> In-Reply-To: <20071023164156.5536.95573.stgit@novell1.haskins.net> References: <20071023164156.5536.95573.stgit@novell1.haskins.net> User-Agent: StGIT/0.12.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1328 Lines: 40 We only need to track if the CPU is in a non-RT state, as opposed to its priority within the non-RT state. So simplify setting in the effort of reducing cache-thrash. Signed-off-by: Gregory Haskins --- kernel/sched.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index a1f1d92..4abe738 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -371,11 +371,19 @@ static inline void set_rq_prio(struct rq *rq, int prio) rq->highest_prio = prio; } +/* + * We dont care what the exact normal priority is. We only care about + * RT-priority, vs non-RT (normal or idle). So flatten the priority if its a + * non-RT variety. This will reduce cache-thrashing on the rq->highest_prio. + */ static inline void update_rq_prio(struct rq *rq) { struct rt_prio_array *array = &rq->rt.active; int prio = sched_find_first_bit(array->bitmap); + if ((prio != MAX_PRIO) && (prio > MAX_RT_PRIO)) + prio = MAX_RT_PRIO; + if (rq->highest_prio != prio) set_rq_prio(rq, prio); } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/