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[23.128.96.18]) by mx.google.com with ESMTP id l3si3770534edr.46.2020.04.22.08.25.08; Wed, 22 Apr 2020 08:25:36 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@cmpxchg-org.20150623.gappssmtp.com header.s=20150623 header.b=tPwEMj6z; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=cmpxchg.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726490AbgDVPWi (ORCPT + 99 others); Wed, 22 Apr 2020 11:22:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726161AbgDVPWg (ORCPT ); Wed, 22 Apr 2020 11:22:36 -0400 Received: from mail-qt1-x841.google.com (mail-qt1-x841.google.com [IPv6:2607:f8b0:4864:20::841]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 358B0C03C1A9 for ; Wed, 22 Apr 2020 08:22:36 -0700 (PDT) Received: by mail-qt1-x841.google.com with SMTP id h26so1651885qtu.8 for ; Wed, 22 Apr 2020 08:22:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cmpxchg-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=H/28R1sGK3+4tkWRg1nQ9VN24FGuw/7gkVIffhG3ews=; b=tPwEMj6zwG6nfDpAp7JPbz5T8v5PSIyp1b6w5YDaBjAXhk4LUgl6MjkiOssn5gLYpa Bzto6WMYQVAv09/g7zeTF3vmYHV1SLdoR5oqdt8OaTxXrAbsgsRveFQWFFdKd4pSiQG4 WsEkuWUcYjkdX3pZtIOG5gadk4WmWclJr6dmEfk7QRmgCsWgoux+7idDSLtawF8FFXSX cFJLeMXgoOBJombQDxlanDNi98FplO231+4UFrwwANzKIIbDjXl4JXDsxDF91eZ9Gnbz 3vcgilyK91oZwJ+oq44GfUjo0p7czgVCeoj4PODN8lY59zWmGyd7mIkXc6sNePLJ/qSa uP/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=H/28R1sGK3+4tkWRg1nQ9VN24FGuw/7gkVIffhG3ews=; b=DWpTmyvd218VTu8oM8gXUzRGJVyGnbDWkLu41DRNeO51nmtFtnBAxJktIuQ94eB+13 +LOWR40a+PmcBtrg7cIVd3KdwVPvowibaDKpCNOJamLyt0Wu34K3MsP3clFblT90mVnB c9LrFF5WdDuIcyuiFtd+TvhC+Gt3PZ8ydoTQw1mSjlfarn5d+vN6LjeqBSbIK7PQ1qSw eC6RlM4FYt96/NyzcoSEqwHcEvWE1sMY0K389AUbNbuotf/a0839akTfDN8TamXHLbdW b4O1+FcxuYf7aAWsrqin1sh/wcCV/3oZP7arwjPmzp0JA7ACF8zT2d4sep6L0JEJLVPB JrfA== X-Gm-Message-State: AGi0PubRRl3HXfEDQFljfurPPF3kQeQrMqyaaxsUDBOAra+b7H8/+RED oQ2i5rlv2Utu1uV2/DZza7VPbQ== X-Received: by 2002:ac8:3459:: with SMTP id v25mr24798077qtb.229.1587568955220; Wed, 22 Apr 2020 08:22:35 -0700 (PDT) Received: from localhost ([2620:10d:c091:480::921]) by smtp.gmail.com with ESMTPSA id e133sm4051525qkb.128.2020.04.22.08.22.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Apr 2020 08:22:34 -0700 (PDT) Date: Wed, 22 Apr 2020 11:22:33 -0400 From: Johannes Weiner To: Peter Zijlstra Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, rostedt@goodmis.org, qais.yousef@arm.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de Subject: Re: [PATCH 21/23] sched,psi: Convert to sched_set_fifo_low() Message-ID: <20200422152233.GA364282@cmpxchg.org> References: <20200422112719.826676174@infradead.org> <20200422112832.465990342@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200422112832.465990342@infradead.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 22, 2020 at 01:27:40PM +0200, Peter Zijlstra wrote: > Because SCHED_FIFO is a broken scheduler model (see previous patches) > take away the priority field, the kernel can't possibly make an > informed decision. > > Effectively no change. > > Cc: hannes@cmpxchg.org > Signed-off-by: Peter Zijlstra (Intel) > Reviewed-by: Ingo Molnar Acked-by: Johannes Weiner