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,URIBL_BLOCKED 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 10430C433FF for ; Thu, 1 Aug 2019 11:18:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0624214DA for ; Thu, 1 Aug 2019 11:18:21 +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="HjeriqX6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730392AbfHALSU (ORCPT ); Thu, 1 Aug 2019 07:18:20 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:44196 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728060AbfHALST (ORCPT ); Thu, 1 Aug 2019 07:18:19 -0400 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=/BSdPIoCwgRhHfWOHPwPqGUqxLt3gcCsEyPPvDK5A6s=; b=HjeriqX6h1t0O+Mrqo9Zem9sSF ULZLO+kJYkXvAlNBcB4M6ujRWYH5Lffth2MdkccIUPXfwjF4MkGSErTFitUqR+sglo+HxZbkWEIbj 5nfK/HY2sMh5Dth4MXPsrcFN1qUYG2GbD/L7XjK9ivniLKaQGdtHuNrTU0hE0OujrUlNMcZYQ5y5N 0cvavI11AxrJVt2QdEgfpzoc2ZIW9tqunHmkb5YpKQMsR4uGpp+cVmSSJ+lhkTZlXrSPGiB9AKCG0 S5EwE0GGQShYlgeMyYzA+tLf7cx4rdPqerZ0z7Eu3nO3Ko9MYP873E7GDVzf2xk0zMb7dq3xtELlP +tOWc1TQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1ht966-0006Ue-Iq; Thu, 01 Aug 2019 11:18:14 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 7C4F52029FA0E; Thu, 1 Aug 2019 13:18:12 +0200 (CEST) Message-Id: <20190801111541.685367413@infradead.org> User-Agent: quilt/0.65 Date: Thu, 01 Aug 2019 13:13:49 +0200 From: Peter Zijlstra To: mingo@kernel.org Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, Suren Baghdasaryan , Johannes Weiner , Thomas Gleixner Subject: [PATCH 1/5] sched/pci: Reduce psimon FIFO priority References: <20190801111348.530242235@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 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. Cc: Suren Baghdasaryan Cc: Johannes Weiner Cc: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) --- kernel/sched/psi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -1051,7 +1051,7 @@ struct psi_trigger *psi_trigger_create(s if (!rcu_access_pointer(group->poll_kworker)) { struct sched_param param = { - .sched_priority = MAX_RT_PRIO - 1, + .sched_priority = 1, }; struct kthread_worker *kworker;