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=-7.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 BB633C433E0 for ; Tue, 30 Jun 2020 21:34:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CD782065D for ; Tue, 30 Jun 2020 21:34:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=digitalocean.com header.i=@digitalocean.com header.b="EsiBj06E" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729462AbgF3VeK (ORCPT ); Tue, 30 Jun 2020 17:34:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726019AbgF3VeC (ORCPT ); Tue, 30 Jun 2020 17:34:02 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2768C03E97B for ; Tue, 30 Jun 2020 14:34:02 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id q17so9979494pfu.8 for ; Tue, 30 Jun 2020 14:34:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=digitalocean.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=WcvE7JAuPHDDzdMoQR1rksQHBDPFbnVuufXjLlTocNo=; b=EsiBj06EYMuYtamJn8zALmqja7clBzqKtLSqUhInUucvoZQANEOUXEMJKxy7VqxAO0 NEGRYMv65xZfiXeaAgZXgjjGzFw0BbH0G783qWB6rNNG7Vl4npzmm7ZcPJzc202XTojo H2X7p2Km16sBAg7qS8rIruGxN21EQQkKf4B2g= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=WcvE7JAuPHDDzdMoQR1rksQHBDPFbnVuufXjLlTocNo=; b=Wh9q2JW1SPtbBXzTEYlBfohNSrtNDlYEHyLr++ivRa9oy7ajl/x2RWTPtFWKvoyQ5D VUMVxDJAYZ/S0ZwdJDd2+Ye8VevLN/SyCAOUmotdl0//qjhDVXz1dMm46BfUJp/irOVr O8cl9hDAZmm980qicfrli7LtTX9Y7XF51bJ2UwE3vPuimbMX33BgimZyKLHivgknchDs D7LqyrAoS6bKnbRyJbke1Cor6FQnOnITwPPpbzrh5NOKNkt+X96yajk5eW1KbscsgGTX VKqrtRgX2hatU2FyNThQGIWBdZhbjBct06OCM/1jOk7WH88Bbozn+v4KwmG1hBCUMh1J ewiw== X-Gm-Message-State: AOAM533AuS0I3d/HHX40c9S5XkDRp0JIeJ/6hli+PdO6aUCHPv5f9kr2 K29nu4NvNEvO6ZQnQ4sV8x0ivQ== X-Google-Smtp-Source: ABdhPJzFOfQsA0OKZp7LSI5CSbuWyY91iR4qKVhRRqnrHC+Qouv4AgllU4j1liDPjgZBKKARulLNag== X-Received: by 2002:a62:6142:: with SMTP id v63mr2853216pfb.179.1593552842290; Tue, 30 Jun 2020 14:34:02 -0700 (PDT) Received: from vpillai-dev.sfo2.internal.digitalocean.com ([138.68.32.68]) by smtp.gmail.com with ESMTPSA id a68sm3181323pje.35.2020.06.30.14.34.01 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 30 Jun 2020 14:34:01 -0700 (PDT) From: Vineeth Remanan Pillai To: Nishanth Aravamudan , Julien Desfossez , Peter Zijlstra , Tim Chen , mingo@kernel.org, tglx@linutronix.de, pjt@google.com, torvalds@linux-foundation.org Cc: linux-kernel@vger.kernel.org, subhra.mazumdar@oracle.com, fweisbec@gmail.com, keescook@chromium.org, kerrnel@google.com, Phil Auld , Aaron Lu , Aubrey Li , Valentin Schneider , Mel Gorman , Pawan Gupta , Paolo Bonzini , Joel Fernandes , joel@joelfernandes.org, vineethrp@gmail.com, Chen Yu , Christian Brauner Subject: [RFC PATCH 16/16] sched: Debug bits... Date: Tue, 30 Jun 2020 21:32:37 +0000 Message-Id: <20543884f2f97fe59b5d0900734b424f08145d56.1593530334.git.vpillai@digitalocean.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Zijlstra Not-Signed-off-by: Peter Zijlstra (Intel) --- kernel/sched/core.c | 44 ++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 42 insertions(+), 2 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2ec56970d6bb..0362102fa3d2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -105,6 +105,10 @@ static inline bool prio_less(struct task_struct *a, struct task_struct *b) int pa = __task_prio(a), pb = __task_prio(b); + trace_printk("(%s/%d;%d,%Lu,%Lu) ?< (%s/%d;%d,%Lu,%Lu)\n", + a->comm, a->pid, pa, a->se.vruntime, a->dl.deadline, + b->comm, b->pid, pb, b->se.vruntime, b->dl.deadline); + if (-pa < -pb) return true; @@ -302,12 +306,16 @@ static void __sched_core_enable(void) static_branch_enable(&__sched_core_enabled); stop_machine(__sched_core_stopper, (void *)true, NULL); + + printk("core sched enabled\n"); } static void __sched_core_disable(void) { stop_machine(__sched_core_stopper, (void *)false, NULL); static_branch_disable(&__sched_core_enabled); + + printk("core sched disabled\n"); } void sched_core_get(void) @@ -4477,6 +4485,14 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) put_prev_task(rq, prev); set_next_task(rq, next); } + + trace_printk("pick pre selected (%u %u %u): %s/%d %lx\n", + rq->core->core_task_seq, + rq->core->core_pick_seq, + rq->core_sched_seq, + next->comm, next->pid, + next->core_cookie); + return next; } @@ -4551,6 +4567,9 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) */ if (i == cpu && !need_sync && !p->core_cookie) { next = p; + trace_printk("unconstrained pick: %s/%d %lx\n", + next->comm, next->pid, next->core_cookie); + goto done; } @@ -4559,6 +4578,9 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) rq_i->core_pick = p; + trace_printk("cpu(%d): selected: %s/%d %lx\n", + i, p->comm, p->pid, p->core_cookie); + /* * If this new candidate is of higher priority than the * previous; and they're incompatible; we need to wipe @@ -4575,6 +4597,8 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) rq->core->core_cookie = p->core_cookie; max = p; + trace_printk("max: %s/%d %lx\n", max->comm, max->pid, max->core_cookie); + if (old_max) { for_each_cpu(j, smt_mask) { if (j == i) @@ -4602,6 +4626,7 @@ next_class:; rq->core->core_pick_seq = rq->core->core_task_seq; next = rq->core_pick; rq->core_sched_seq = rq->core->core_pick_seq; + trace_printk("picked: %s/%d %lx\n", next->comm, next->pid, next->core_cookie); /* * Reschedule siblings @@ -4624,11 +4649,20 @@ next_class:; if (i == cpu) continue; - if (rq_i->curr != rq_i->core_pick) + if (rq_i->curr != rq_i->core_pick) { + trace_printk("IPI(%d)\n", i); resched_curr(rq_i); + } /* Did we break L1TF mitigation requirements? */ - WARN_ON_ONCE(!cookie_match(next, rq_i->core_pick)); + if (unlikely(!cookie_match(next, rq_i->core_pick))) { + trace_printk("[%d]: cookie mismatch. %s/%d/0x%lx/0x%lx\n", + rq_i->cpu, rq_i->core_pick->comm, + rq_i->core_pick->pid, + rq_i->core_pick->core_cookie, + rq_i->core->core_cookie); + WARN_ON_ONCE(1); + } } done: @@ -4667,6 +4701,10 @@ static bool try_steal_cookie(int this, int that) if (p->core_occupation > dst->idle->core_occupation) goto next; + trace_printk("core fill: %s/%d (%d->%d) %d %d %lx\n", + p->comm, p->pid, that, this, + p->core_occupation, dst->idle->core_occupation, cookie); + p->on_rq = TASK_ON_RQ_MIGRATING; deactivate_task(src, p, 0); set_task_cpu(p, this); @@ -7305,6 +7343,8 @@ int sched_cpu_starting(unsigned int cpu) WARN_ON_ONCE(rq->core && rq->core != core_rq); rq->core = core_rq; } + + printk("core: %d -> %d\n", cpu, cpu_of(core_rq)); #endif /* CONFIG_SCHED_CORE */ sched_rq_cpu_starting(cpu); -- 2.17.1