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 22C37382286 for ; Tue, 31 Mar 2026 07:14:28 +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=1774941270; cv=none; b=qs7xcudXspzHHGMGIlYEfhhk2HNj2nFlsjgXN1Vz8EP7AnS3/R+kPJlHdpA2SPTzh1Cm0bWsjjhljcmZcDC9u00zKIz4iKVH9fEGWXMt148SwQXeNx5SQ4lfC6wVY7gMCPGK6q91Pn3Pprr1yhsKHowokCxbmaiL5rPzbpXdT0Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774941270; c=relaxed/simple; bh=67huC+HSF7v9HAyzg/+ZwKyyWd8CMDgtaLI3SiLbkiE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Wm92OHhr1Gt6Hexj1pfl6mYysyH7yPh5xHFEUmrTkt8KreIODgtQhQ+sb/X0HrXIgGmY45mr72X43BC9pVvqJ0/3PJFSw+PqCVJMVOxqF4Tl4d3W3LptrwujGDragBvtQcQBVuCmFnxJi3fWT/mCYlJtVs2P2K5yflCekimdH+I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=nQOiQetg; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="nQOiQetg" 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=CgKkz/hg8DLan5BRU7h+OQOTfduYU0mzm3a0K7BiCwQ=; b=nQOiQetgNGhdi53tgRFgpRtVNM CtBRyX/bDHilp9xJRE7KruMhfkdJWDCpSOwgP54ObGYmThc+SnVNXRyruZbC/t+msmU1kz8kCKZJP YqqQx7EPvFjRabHVSEnixlR5eWWsuCm0/r+xBlYhGPOBKd1zu5LqPO4nzpyPX/uJWmqF7XDtciFfD f2UUwXsto6N4QECtCPpDXDtCDsPYMUL6d7w9MmyLbqoo4lB0Q1GWyvXKzTaAM3NkeKE1VBAF2I9K6 bNBNyRvBeSfvYIuHQeaFomHT/kUoPdmZFQHLRx9Re2n8047EhbLFutzlgGgnPEWddEGUyeFbpxdQR JIMpCclg==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7TIZ-0000000FG3o-0wSV; Tue, 31 Mar 2026 07:14:04 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id A6B6A300400; Tue, 31 Mar 2026 09:14:02 +0200 (CEST) Date: Tue, 31 Mar 2026 09:14:02 +0200 From: Peter Zijlstra To: K Prateek Nayak Cc: John Stultz , mingo@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, linux-kernel@vger.kernel.org, wangtao554@huawei.com, quzicheng@huawei.com, dsmythies@telus.net, shubhang@os.amperecomputing.com, Suleiman Souhlal Subject: Re: [PATCH v2 1/7] sched/fair: Fix zero_vruntime tracking Message-ID: <20260331071402.GN3739106@noisy.programming.kicks-ass.net> References: <20260219075840.162631716@infradead.org> <20260219080624.438854780@infradead.org> <20260330101018.GN3738786@noisy.programming.kicks-ass.net> <73dab51a-650f-4c82-9e73-13236b2a26c2@amd.com> <20260330144005.GP3738786@noisy.programming.kicks-ass.net> <20260330191108.GU2872@noisy.programming.kicks-ass.net> <20260331070822.GC3739027@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: <20260331070822.GC3739027@noisy.programming.kicks-ass.net> On Tue, Mar 31, 2026 at 09:08:23AM +0200, Peter Zijlstra wrote: > On Tue, Mar 31, 2026 at 06:08:27AM +0530, K Prateek Nayak wrote: > > > The above doesn't recover after a avg_vruntime(). Btw I'm running: > > > > nice -n 19 stress-ng --yield 32 -t 1000000s& > > while true; do perf bench sched messaging -p -t -l 100000 -g 16; done > > And you're running that on a 16 cpu machine / vm ? W00t, it went b00m. Ok, let me go add some tracing.