From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 ADAFC3BBFC0 for ; Sat, 22 Aug 2026 09:43:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787391795; cv=none; b=olxDw49SpPIHW1nRVgYMG3QkvbIew9nCN46QLyfi821BPRIQ4nYmzpfk6L/9D9wxrfWfLyGYiJotWHS/SrIoVHlGQVvYAx1uOfnlamZyM6yY5c4hpXrCsLuH/Z60BsvQODXuievKWP2NPI37PFdvGVAkoBLfFfyRVRnjM49TNUI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787391795; c=relaxed/simple; bh=WBGZsrp4vLNnKwwCPK+s+tbZxY9W6V8PSrPuz8fMjEY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=QfDBz4qFDtGyilzDihcxzduB/UNtjlgSRrV+qKvktQXwppEFKrnUONe0v6uhKuvDPGQ1b1bnTK/wCUMrUIwaj/qNeuatkKuEfOU8ulbDhhesVFVS5A65CZmWu4pIeh2Q/xPZOvp8Lilsfcv9pVGMWO+1sYZgQv8Y2ztT7Bfgntc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=pwbnwvHw; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=pass 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="pwbnwvHw" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=3PmcVB3KCxbrKmAsfkhneQpBrqv3IsMZrUA2hB5wfD0=; b=pwbnwvHwmRX9AVIO+BOih49f1m 3madVx0RksxvZigjAKpwHk1OeVZeD3R/HnyIpj1mwt4Qry5juQpOY+vMFAcM24VttpHhOXXM/MlJT /iQpkKGhxtJ71BTCxxyFPPhZrt42O/9HbsZ1rIzZPcwQTocnQHKYVCop0enf0YbBRgYZEgphwdOIu zQHb+TG1H2yQyPsmJ5lOCL1clcZ1sC8DQC8tgX7IQwhx6OeZj4PmrzWQ0s+W0CMsnJrbMF/gHGKGi 4bgkDtdk/fKQVsmQt9yopz8wy45Xb2CDaC8iH55MOuilyycPL4r4+ouilFK4ErApkHCcHvfkfDqbw p+xnejWw==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wxiFc-00000001HI5-1Jiq; Sat, 22 Aug 2026 09:42:56 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id EFFC1300382; Sat, 22 Aug 2026 11:42:54 +0200 (CEST) Date: Sat, 22 Aug 2026 11:42:54 +0200 From: Peter Zijlstra To: K Prateek Nayak Cc: Aaron Lu , mingo@kernel.org, linux-kernel@vger.kernel.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, tj@kernel.org, williams@redhat.com, jkacur@redhat.com Subject: Re: [PATCH 0/2] sched: Remove sched_class::balance() Message-ID: <20260822094254.GH687043@noisy.programming.kicks-ass.net> References: <20260624121327.190063948@infradead.org> <20260702114919.GA186418@bytedance.com> <20260820154052.GB4120091@noisy.programming.kicks-ass.net> <3898f82d-e48a-48d5-a13d-54fa5387a203@amd.com> 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: <3898f82d-e48a-48d5-a13d-54fa5387a203@amd.com> On Thu, Aug 20, 2026 at 10:45:03PM +0530, K Prateek Nayak wrote: > On 8/20/2026 9:10 PM, Peter Zijlstra wrote: > > On Thu, Jul 02, 2026 at 07:49:19PM +0800, Aaron Lu wrote: > > > >> The test caused a panic with below msg: > > > > What test do you run? I think all I have is the prctl selftest thing. > > Stuff that goes sideways generally shows up with: > > coresched new -t pid -- perf bench sched messaging -p -l 100000 -g 8 > > I generally consider a full run without any splats as a pass. > Performance tends to vary quite a bit depending upon number of groups. OK, queue.git/sched/hackery survives that. I'll set up Aaron's test on Monday to see if it survives that too. Also, the patches need to be redone, they're a bit of a mess.