From patchwork Wed Jun 17 21:02:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Robert Foley X-Patchwork-Id: 11610767 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CA71590 for ; Wed, 17 Jun 2020 21:54:57 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A1EB42168B for ; Wed, 17 Jun 2020 21:54:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="bO9MuSq1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A1EB42168B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:33390 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jlg1I-0007J3-U0 for patchwork-qemu-devel@patchwork.kernel.org; Wed, 17 Jun 2020 17:54:56 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38298) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jlfF1-0004mC-BO for qemu-devel@nongnu.org; Wed, 17 Jun 2020 17:05:03 -0400 Received: from mail-qk1-x743.google.com ([2607:f8b0:4864:20::743]:34526) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jlfEx-0000Qd-99 for qemu-devel@nongnu.org; Wed, 17 Jun 2020 17:05:01 -0400 Received: by mail-qk1-x743.google.com with SMTP id f18so3525502qkh.1 for ; Wed, 17 Jun 2020 14:04:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=kEALw3cb/snp1kLPThKHADdrwsKNjGM+CsHVn0z1BOY=; b=bO9MuSq1OMXIKKUrkq0Ed1xUAKaGJHYI3TUP8sVHeVVlXy8kYH34c8iZgMJ7FGnlqe LtFgPKywurlzQsVGxJ+n385Gxywl8qMKrJusr9swyNSfM3ix8tHpJMafEU+pLWKQI6iH sVjHNyiQd+vTndm/NIBFjdGdApsInLbwWq+1lIdmXpRff6HaHI5VmnqhejNxGBQNCpI3 GNpwgL8Zt05GSWMz2KJLeu9VCQbJ9U826hXuqgwsQM9KtnHQrZtRU5FCUohfbxYRBzC1 PNdle87wdF5h7jtxISc2tomBatJOEAFx1/oThnriGf/ZERfyrgcuLg8ymi0XmJw604ib irjg== 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:mime-version:content-transfer-encoding; bh=kEALw3cb/snp1kLPThKHADdrwsKNjGM+CsHVn0z1BOY=; b=OeTJPSthp0iRxitLyTqHbD5M/iqIBSnoczQpJizvzhgr29lwQHwbcN61hg+XOLkzXU 9jhvshn0mZC/Y7LMO9VyqWR5v31LbDTIkteyjGPGX0/t0c3WB8kYuA/zfXvE7XcrDfJO BiiwCwRd7GgXiW2fYL8sRb51aM8iGkmhHNl2bcd2I7GBAxGoguzzFk5MyWAbC9pxaVF/ d7S8FR1p6gGzkVZ73glcDiW6e68M/w36p7cPzhdsXaN4HtnnJTPWrvGrQPRx0rBOLjfK bo4MSiodYnkyg5a05ysSPgXWE/NzQi5afTHTrVnTstmoY8EnWOElrGANGPr9h/3eD3kF HTIw== X-Gm-Message-State: AOAM531B26OfLKMZWk+WZ7Abg75wgkFjTQQ+IhzUT5iZWoKeXkkJgBjP uBUki7tdWDM8WLvu968Y0sgIGQ/rPhX3xw== X-Google-Smtp-Source: ABdhPJyzFaP57/N9Q4K0gShHJH+xWEY+/KTNguIWfv27cMjyiMhByKkqR1X3YNWLKaDskUXg6ijGRA== X-Received: by 2002:a37:d246:: with SMTP id f67mr578006qkj.300.1592427897910; Wed, 17 Jun 2020 14:04:57 -0700 (PDT) Received: from Rfoley-MA01.hsd1.ma.comcast.net ([2601:199:4480:60c0:fc79:714c:9711:2e9c]) by smtp.gmail.com with ESMTPSA id w13sm997245qkb.91.2020.06.17.14.04.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2020 14:04:57 -0700 (PDT) From: Robert Foley To: qemu-devel@nongnu.org Subject: [PATCH v10 71/73] cpus-common: release BQL earlier in run_on_cpu Date: Wed, 17 Jun 2020 17:02:29 -0400 Message-Id: <20200617210231.4393-72-robert.foley@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200617210231.4393-1-robert.foley@linaro.org> References: <20200617210231.4393-1-robert.foley@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::743; envelope-from=robert.foley@linaro.org; helo=mail-qk1-x743.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robert.foley@linaro.org, cota@braap.org, Paolo Bonzini , peter.puhov@linaro.org, alex.bennee@linaro.org, Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: "Emilio G. Cota" After completing the conversion to per-CPU locks, there is no need to release the BQL after having called cpu_kick. Reviewed-by: Richard Henderson Reviewed-by: Alex Bennée Signed-off-by: Emilio G. Cota Signed-off-by: Robert Foley --- cpus-common.c | 20 +++++--------------- 1 file changed, 5 insertions(+), 15 deletions(-) diff --git a/cpus-common.c b/cpus-common.c index 0287018dc4..eecd63029a 100644 --- a/cpus-common.c +++ b/cpus-common.c @@ -135,6 +135,11 @@ void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data) return; } + /* We are going to sleep on the CPU lock, so release the BQL */ + if (has_bql) { + qemu_mutex_unlock_iothread(); + } + wi.func = func; wi.data = data; wi.done = false; @@ -143,21 +148,6 @@ void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data) cpu_mutex_lock(cpu); queue_work_on_cpu_locked(cpu, &wi); - - /* - * We are going to sleep on the CPU lock, so release the BQL. - * - * During the transition to per-CPU locks, we release the BQL _after_ - * having kicked the destination CPU (from queue_work_on_cpu_locked above). - * This makes sure that the enqueued work will be seen by the CPU - * after being woken up from the kick, since the CPU sleeps on the BQL. - * Once we complete the transition to per-CPU locks, we will release - * the BQL earlier in this function. - */ - if (has_bql) { - qemu_mutex_unlock_iothread(); - } - while (!atomic_mb_read(&wi.done)) { CPUState *self_cpu = current_cpu;