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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 94E76C47409 for ; Tue, 10 Dec 2019 22:04:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 62D7721D7D for ; Tue, 10 Dec 2019 22:04:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="q5J+fBjh"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="1Km/cCl6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 62D7721D7D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+8spOCOXGXLlsZ4MTfSAiMylEonkG35iLRg4qQbCkNE=; b=q5J+fBjh7JsE4k 4lxwbih990VOQCJ6rDY303v+pgMnUp2Ykp2HWm0sf7KzmjNCoIROzXJvltv0QWhY9arLLZKtl+FQ7 LhoZjs/AAZLzz6w+AXl6yAzLAMAldaKQL74IFCX38TlY+4FbqFCgF9JwOP6CBJIiLhymInb1CGnZU SptN/C/xV5JH47QkIFhCb/3aSFpAqkHnCk302Y9ovt/z1dJtrG6O1AXkEULwY8xNPB3sVC+r1UrmN Wexx9/B2Q9YSQWyhfZQ17a9W/QtnC8v1Fyd0uQ+vx/OCHPltETO9B4kv7xxxNU97YkXeIhjLSFcuL L8rsFZWEjf9yHO0Lv0sQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iencF-0000VJ-8g; Tue, 10 Dec 2019 22:04:23 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ienc3-0000II-OJ for linux-arm-kernel@lists.infradead.org; Tue, 10 Dec 2019 22:04:13 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 97C212465E; Tue, 10 Dec 2019 22:04:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576015451; bh=W1rixHlRglZalpJ3fSvD2qz0lSsb15o4abLzRwMrYYo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1Km/cCl626oqYcOS2RGhSNtWspd0BGhZspE7efBonyRMwKSz3PH6QjM+cnIawbyB5 c00Ju4YbS0T1eu6RBdTtSqmPjEF5HgopasFKvCZD0Q7Pfq8QadtVUfzevXcTQQMIQ9 kdRrmIIqjpHnKoW39hvtCRmNKrfSPQnYgancTYDw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 058/130] arm64: psci: Reduce the waiting time for cpu_psci_cpu_kill() Date: Tue, 10 Dec 2019 17:01:49 -0500 Message-Id: <20191210220301.13262-58-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210220301.13262-1-sashal@kernel.org> References: <20191210220301.13262-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191210_140411_857612_AE4EF30F X-CRM114-Status: GOOD ( 13.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Catalin Marinas , linux-arm-kernel@lists.infradead.org, Yunfeng Ye , Sudeep Holla Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Yunfeng Ye [ Upstream commit bfcef4ab1d7ee8921bc322109b1692036cc6cbe0 ] In cases like suspend-to-disk and suspend-to-ram, a large number of CPU cores need to be shut down. At present, the CPU hotplug operation is serialised, and the CPU cores can only be shut down one by one. In this process, if PSCI affinity_info() does not return LEVEL_OFF quickly, cpu_psci_cpu_kill() needs to wait for 10ms. If hundreds of CPU cores need to be shut down, it will take a long time. Normally, there is no need to wait 10ms in cpu_psci_cpu_kill(). So change the wait interval from 10 ms to max 1 ms and use usleep_range() instead of msleep() for more accurate timer. In addition, reducing the time interval will increase the messages output, so remove the "Retry ..." message, instead, track time and output to the the sucessful message. Signed-off-by: Yunfeng Ye Reviewed-by: Sudeep Holla Signed-off-by: Catalin Marinas Signed-off-by: Sasha Levin --- arch/arm64/kernel/psci.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c index e8edbf13302aa..3856d51c645b5 100644 --- a/arch/arm64/kernel/psci.c +++ b/arch/arm64/kernel/psci.c @@ -84,7 +84,8 @@ static void cpu_psci_cpu_die(unsigned int cpu) static int cpu_psci_cpu_kill(unsigned int cpu) { - int err, i; + int err; + unsigned long start, end; if (!psci_ops.affinity_info) return 0; @@ -94,16 +95,18 @@ static int cpu_psci_cpu_kill(unsigned int cpu) * while it is dying. So, try again a few times. */ - for (i = 0; i < 10; i++) { + start = jiffies; + end = start + msecs_to_jiffies(100); + do { err = psci_ops.affinity_info(cpu_logical_map(cpu), 0); if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) { - pr_info("CPU%d killed.\n", cpu); + pr_info("CPU%d killed (polled %d ms)\n", cpu, + jiffies_to_msecs(jiffies - start)); return 0; } - msleep(10); - pr_info("Retrying again to check for CPU kill\n"); - } + usleep_range(100, 1000); + } while (time_before(jiffies, end)); pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n", cpu, err); -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel