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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 AE747C3A5A6 for ; Tue, 27 Aug 2019 08:03:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 75C2E206BA for ; Tue, 27 Aug 2019 08:03:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566892998; bh=MhsFc+QRsWTNNcT+24bWzeeQwJHKtt8UKjhaEbwPOEE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yUJj0RfcoIr2+4mf9LAVoU/Yg495K79Zihrh2qHpO3ekpf8BxzganheHB8qB4KKDI pCvsMIliRhQSmrPP5d/E8sgXVb37BBLSH67V3j4J5TuaSGRi43yyVxuDhcL/dEUT9D R1EvGKl0wsrVqfrvZ/QX2HLlz09Rn3MzJuLY3PB8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731413AbfH0IDH (ORCPT ); Tue, 27 Aug 2019 04:03:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:60450 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731696AbfH0IDH (ORCPT ); Tue, 27 Aug 2019 04:03:07 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D2D40206BA; Tue, 27 Aug 2019 08:03:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566892986; bh=MhsFc+QRsWTNNcT+24bWzeeQwJHKtt8UKjhaEbwPOEE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PCfdAL81DhghY1pNDndVOgeWfrq4C41v5mTQQXNCLG7LSxZUiXqxZ65cSn6zhkYXI sg6gZovsXfsX79gqIEqS5JFNqrQFgjvWwqJ/8c5ig09a+7ZLsKWZ8sZNSAvoqbeDBd 2qBfs9FtgW7uJnOVVt0IpFnVE/tRWJtOwgo/191s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Peter Zijlstra (Intel)" , Johannes Weiner , Suren Baghdasaryan , Thomas Gleixner , Sasha Levin Subject: [PATCH 5.2 083/162] sched/psi: Reduce psimon FIFO priority Date: Tue, 27 Aug 2019 09:50:11 +0200 Message-Id: <20190827072741.016547724@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190827072738.093683223@linuxfoundation.org> References: <20190827072738.093683223@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 14f5c7b46a41a595fc61db37f55721714729e59e ] PSI defaults to a FIFO-99 thread, reduce this to FIFO-1. FIFO-99 is the very highest priority available to SCHED_FIFO and it not a suitable default; it would indicate the psi work is the most important work on the machine. Since Real-Time tasks will have pre-allocated memory and locked it in place, Real-Time tasks do not care about PSI. All it needs is to be above OTHER. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Johannes Weiner Tested-by: Suren Baghdasaryan Cc: Thomas Gleixner Signed-off-by: Sasha Levin --- kernel/sched/psi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index 7acc632c3b82b..7fe2c5fd26b54 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -1051,7 +1051,7 @@ struct psi_trigger *psi_trigger_create(struct psi_group *group, if (!rcu_access_pointer(group->poll_kworker)) { struct sched_param param = { - .sched_priority = MAX_RT_PRIO - 1, + .sched_priority = 1, }; struct kthread_worker *kworker; -- 2.20.1