From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7265D15AD7 for ; Thu, 11 Jan 2024 09:33:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="loRrzx5M" Received: by mail-wm1-f54.google.com with SMTP id 5b1f17b1804b1-40e5f3b390fso3619095e9.2 for ; Thu, 11 Jan 2024 01:33:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1704965622; x=1705570422; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=+YZVP+CQcVdj5PNGHVAEFPym8Eeh6QaRGrvosV6Ad1s=; b=loRrzx5M3AI/e7TgWhd9OZB8lIbwGSk6jnzFRpVzgOVbiqHOTLpLWoIhHAUb56fTKs u/X6pF2zJabfxD34hekhkMRHy3MqsRp5QnLE7+N7fbGFQN6rP6/YsbMaDEh3dp6MPECh x3y6d9cXbqosieNQMGfzBbn628nq3kK6GkkzmOIV4fG5w25R4DY9a87PsRjd3kOm3Cmz zq71M9HnARrzAV+g6amkE1wniQo7NK80nPvFbw0mcqS57ZxtpVL7qRdw967KyiaYd7QB y78E40zX11P+BGJ5U+7qTCmiCga+mq7MdTAtCtthcHvCjFDz+7Aep0TvJMbGWU+Nf+A4 9Opg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704965622; x=1705570422; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+YZVP+CQcVdj5PNGHVAEFPym8Eeh6QaRGrvosV6Ad1s=; b=VoadG2VwWDX8fUFLW4Qlf35TMSGJ5kVCx5Dms87j5semMKix/gwoJNorfrO0ZVCmtX qdehIlMByo0pcZcTFMeCsGmH793ILXS/Nmo34zXaD+/agXSVkQhMXfzBAICi1kCrFWlI P1etxE9kA/GyGto3AX9eBSPwzZpfQz/ngzBTce17qyVJ2N3Gx/rlxugVCStndK3H2H3z VZBt2LFSK+8jJg2ILd4ImnChw6I+tc3pJgd6tj7MLL7pY178oN2H9Hw5EGIEEAqgBIxF vuP3SDeOK3yZTwI09wXmwL9bFVS+2P/SxfAoS1ZkcQshk3T5phlRoQ4QA6hpK8i6SKJ0 sdxw== X-Gm-Message-State: AOJu0Yz8DJdHXrIXKIlxLZHKQoE/ztEHoYBhh419+IIAbVUCvIzfHEcw SvpcWPyoVxpl4zsboNwcdM4= X-Google-Smtp-Source: AGHT+IFtk/QqleOM9nDbjIjbcyXJZg0NuHmJ+AYjnTJJlB/neiOfnPyx8uVJkauE14LRebXthUNF8Q== X-Received: by 2002:a05:600c:1d86:b0:40e:4920:8c5b with SMTP id p6-20020a05600c1d8600b0040e49208c5bmr234560wms.122.1704965622369; Thu, 11 Jan 2024 01:33:42 -0800 (PST) Received: from gmail.com (1F2EF3FE.nat.pool.telekom.hu. [31.46.243.254]) by smtp.gmail.com with ESMTPSA id fc19-20020a05600c525300b0040d839e7bb3sm5136576wmb.19.2024.01.11.01.33.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Jan 2024 01:33:41 -0800 (PST) Sender: Ingo Molnar Date: Thu, 11 Jan 2024 10:33:39 +0100 From: Ingo Molnar To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider Subject: Re: [GIT PULL] Scheduler changes for v6.8 Message-ID: References: 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: * Linus Torvalds wrote: > On Mon, 8 Jan 2024 at 06:07, Ingo Molnar wrote: > > > > Please pull the latest sched/core git tree from: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-core-2024-01-08 > > Just a note that I'm currently bisecting into this merge for a > horrendous performance regression. > > It makes my empty kernel build go from 22 seconds to 44 seconds, and > makes a full kernel build enormously slower too. Ouch, that's horrible ... > I haven't finished the bisection, but it's now inside *just* this > pull, so I can already tell that I'm going to revert something in > here, because this has been making my merge window miserable. Just as a quick test, does switching to the 'performance' governor work around the regression: for ((cpu=0; cpu < $(nproc); cpu++)); do echo performance > /sys/devices/system/cpu/cpu$cpu/cpufreq/scaling_governor; done Thanks, Ingo