From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3110F22EFB for ; Mon, 15 Apr 2024 07:23:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713165797; cv=none; b=oXm8YVxc62IVEvmth8DEumRNT9qT7J4WM0tcxrNvo3zP9AwxZ0Fv1+Ehxfdbklqgo0lNrD9dYoPlnR1nFwGWPWdUbi/oiFeaLQwkOVzVJpo71whP+jTEJG05D+9Hrk08o2t2xz4bU/jt1mfvFnngPtNga1L0L75EMalfUQrMDmg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713165797; c=relaxed/simple; bh=827hdgoqW5AbO6bifAUuyp9xXZRxJEjy1Rg4gUC2fXA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=gy91vD7AdYbSl9vYPxmLUqpQLE/YPCupK5ggtWqD2g0qhZ/SE85iqT23+6jC5G9pp74RQ+NTrfebQIjHmSM+S78BtPGKMIh/cZz/25JAKvqZTMq1lfOrlh1F4VkCTEk5C0dhJdyJzB6s8DJb38oeG+eJZUiBWZNrhnB5ETKipbQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=EfysjrlE; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="EfysjrlE" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=827hdgoqW5AbO6bifAUuyp9xXZRxJEjy1Rg4gUC2fXA=; b=EfysjrlEO2n5+HbwFmW3gBDeij S8m+E292t6VmzGofOl2fFPjZFK6u7Kl6TxxxuixlgKqbFDaBftzg5fZ9NNnnMo2ZMu1n3TZgzdnn0 gY0sOEG4ghZsOqjzGDHIvr/IZ2WsgKc1cECcdPMhUAQEBR/QAjM935Lg0eYzJBUuiswFn8fPcUnfB 99g6bhD4TGHY4a6m7i6EZqlPDYOVrxBDJ6ttrZNRvmLxKl+HNIlWAvxlR3yjYAKQPX6G0zmXpyZvr kGclyq+lSUz8DsOwO4P2ZrACgrs4lJbhyREUqehJ9qzFVhREhuyP69S9riMKvZVsC+1/OK81heWsQ /276x2og==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rwGg0-0000000ASh1-0FuU; Mon, 15 Apr 2024 07:22:53 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id B3DE530040C; Mon, 15 Apr 2024 09:22:51 +0200 (CEST) Date: Mon, 15 Apr 2024 09:22:51 +0200 From: Peter Zijlstra To: Chen Yu Cc: Abel Wu , Ingo Molnar , Vincent Guittot , Juri Lelli , Tim Chen , Tiwei Bie , Honglei Wang , Aaron Lu , Chen Yu , linux-kernel@vger.kernel.org, kernel test robot Subject: Re: [RFC PATCH] sched/eevdf: Return leftmost entity in pick_eevdf() if no eligible entity is found Message-ID: <20240415072251.GA12673@noisy.programming.kicks-ass.net> References: <20240226082349.302363-1-yu.c.chen@intel.com> <758ebf4e-ee84-414b-99ec-182537bcc168@bytedance.com> <20240408115833.GF21904@noisy.programming.kicks-ass.net> <20240409092104.GA2665@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240409092104.GA2665@noisy.programming.kicks-ass.net> On Tue, Apr 09, 2024 at 11:21:04AM +0200, Peter Zijlstra wrote: > Is there any sane way to reproduce this, and how often does it happen? This, how do you all make it go bang?