From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C4D4C5DF60 for ; Fri, 8 Nov 2019 13:21:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 40AB120865 for ; Fri, 8 Nov 2019 13:21:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="K7ykV8a/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728746AbfKHNVg (ORCPT ); Fri, 8 Nov 2019 08:21:36 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:59260 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728349AbfKHNVg (ORCPT ); Fri, 8 Nov 2019 08:21:36 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-Id:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=x9saMFImixsxOxkUO0AAt4+/Da45uLV/ytMqEdGsD4w=; b=K7ykV8a/cTqIkLQt4wsEskc+Zi 3p6KRqvDO9wRdhciWyTA3NjR7/ofykeLq1WRvsmk2aHkxqRBFFBqEqck3Rl/Cpi7K8K1beT5PJUsF pu7PJgPS8NEMLdtkiwCQlfiYewLbG9itFf8AW+lpA4fYvRSjp5xJBDTEOTStE0SOR8WDaM94WkiwW RTRUL0BAdppxN56Rb6EtcDgwE/ivTAmb5p8KL/X/f4oDNCN5kvqyWUnSTZjBVB6W3HIvbKF6LZYCm fRZkfSHUxzwhBayYnFptD3JWNGo5tT0s5NLCHmXYzYKLQVN/dzyrecYaDgSd0kfxTxoRJVdHEwrit ZJiYjy/w==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iT4CY-0006lJ-T7; Fri, 08 Nov 2019 13:21:23 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id DD3BE306C06; Fri, 8 Nov 2019 14:20:15 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 4DECB20C10EB9; Fri, 8 Nov 2019 14:21:20 +0100 (CET) Message-Id: <20191108131909.660595546@infradead.org> User-Agent: quilt/0.65 Date: Fri, 08 Nov 2019 14:15:58 +0100 From: Peter Zijlstra To: mingo@kernel.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, juri.lelli@redhat.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de Cc: linux-kernel@vger.kernel.org, qperret@google.com, valentin.schneider@arm.com, qais.yousef@arm.com, ktkhai@virtuozzo.com, peterz@infradead.org Subject: [PATCH 5/7] sched: Simplify sched_class::pick_next_task() References: <20191108131553.027892369@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that the indirect class call never uses the last two arguments of pick_next_task(), remove them. Signed-off-by: Peter Zijlstra (Intel) --- kernel/sched/core.c | 6 +++--- kernel/sched/deadline.c | 5 +---- kernel/sched/fair.c | 7 ++++++- kernel/sched/idle.c | 5 +---- kernel/sched/rt.c | 5 +---- kernel/sched/sched.h | 18 +++--------------- kernel/sched/stop_task.c | 5 +---- 7 files changed, 16 insertions(+), 35 deletions(-) --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3924,7 +3924,7 @@ pick_next_task(struct rq *rq, struct tas /* Assumes fair_sched_class->next == idle_sched_class */ if (!p) { put_prev_task(rq, prev); - p = pick_next_task_idle(rq, NULL, NULL); + p = pick_next_task_idle(rq); } return p; @@ -3941,7 +3941,7 @@ pick_next_task(struct rq *rq, struct tas put_prev_task(rq, prev); for_each_class(class) { - p = class->pick_next_task(rq, NULL, NULL); + p = class->pick_next_task(rq); if (p) return p; } @@ -6203,7 +6203,7 @@ static struct task_struct *__pick_migrat struct task_struct *next; for_each_class(class) { - next = class->pick_next_task(rq, NULL, NULL); + next = class->pick_next_task(rq); if (next) { next->sched_class->put_prev_task(rq, next); return next; --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1770,15 +1770,12 @@ static struct sched_dl_entity *pick_next return rb_entry(left, struct sched_dl_entity, rb_node); } -static struct task_struct * -pick_next_task_dl(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) +static struct task_struct *pick_next_task_dl(struct rq *rq) { struct sched_dl_entity *dl_se; struct dl_rq *dl_rq = &rq->dl; struct task_struct *p; - WARN_ON_ONCE(prev || rf); - if (!sched_dl_runnable(rq)) return NULL; --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6743,6 +6743,11 @@ done: __maybe_unused; return NULL; } +static struct task_struct *__pick_next_task_fair(struct rq *rq) +{ + return pick_next_task_fair(rq, NULL, NULL); +} + /* * Account for a descheduled task: */ @@ -10621,7 +10626,7 @@ const struct sched_class fair_sched_clas .check_preempt_curr = check_preempt_wakeup, - .pick_next_task = pick_next_task_fair, + .pick_next_task = __pick_next_task_fair, .put_prev_task = put_prev_task_fair, .set_next_task = set_next_task_fair, --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -391,13 +391,10 @@ static void set_next_task_idle(struct rq schedstat_inc(rq->sched_goidle); } -struct task_struct * -pick_next_task_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) +struct task_struct *pick_next_task_idle(struct rq *rq) { struct task_struct *next = rq->idle; - WARN_ON_ONCE(prev || rf); - set_next_task_idle(rq, next); return next; --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1564,13 +1564,10 @@ static struct task_struct *_pick_next_ta return rt_task_of(rt_se); } -static struct task_struct * -pick_next_task_rt(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) +static struct task_struct *pick_next_task_rt(struct rq *rq) { struct task_struct *p; - WARN_ON_ONCE(prev || rf); - if (!sched_rt_runnable(rq)) return NULL; --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1713,20 +1713,8 @@ struct sched_class { void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags); - /* - * Both @prev and @rf are optional and may be NULL, in which case the - * caller must already have invoked put_prev_task(rq, prev, rf). - * - * Otherwise it is the responsibility of the pick_next_task() to call - * put_prev_task() on the @prev task or something equivalent, IFF it - * returns a next task. - * - * In that case (@rf != NULL) it may return RETRY_TASK when it finds a - * higher prio class has runnable tasks. - */ - struct task_struct * (*pick_next_task)(struct rq *rq, - struct task_struct *prev, - struct rq_flags *rf); + struct task_struct *(*pick_next_task)(struct rq *rq); + void (*put_prev_task)(struct rq *rq, struct task_struct *p); void (*set_next_task)(struct rq *rq, struct task_struct *p); @@ -1822,7 +1810,7 @@ static inline bool sched_fair_runnable(s } extern struct task_struct *pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf); -extern struct task_struct *pick_next_task_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf); +extern struct task_struct *pick_next_task_idle(struct rq *rq); #ifdef CONFIG_SMP --- a/kernel/sched/stop_task.c +++ b/kernel/sched/stop_task.c @@ -34,11 +34,8 @@ static void set_next_task_stop(struct rq stop->se.exec_start = rq_clock_task(rq); } -static struct task_struct * -pick_next_task_stop(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) +static struct task_struct *pick_next_task_stop(struct rq *rq) { - WARN_ON_ONCE(prev || rf); - if (!sched_stop_runnable(rq)) return NULL;