From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.ptr1337.dev (mail.ptr1337.dev [202.61.224.105]) (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 8778F1BDD3; Fri, 10 May 2024 18:24:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.61.224.105 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715365475; cv=none; b=oU/BxZky7fPoxoZl+WYWtFMEvgjBUsurABUvumzv9fEyCz+tjQ7pqCF1jrOZ/Fx5jlf7aGh3tbWdUUFy184mAz212pkdGGJLcsluBCKDGfp/CNaf+rtlWOIq324aYyu5vFKokXSbIStRv8WgfZ9WxvmwkrpdgKtmDt/+Wf5bVCw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715365475; c=relaxed/simple; bh=Sodupjyz/UTgYwBl3W3Y82c8ysbojClXP6VQyeeJH6I=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=DBb6di0zDd2ohgTkzUPyPHlb+/3PsrMVt3GESEo8p6wD8uJ97/YlJ9Zv2HEWdawlQ4qkq45TKNTHKxCE4cfeMBree7eKcfxH6NMUSgz1Fbk04/lmUeJWwEIFMOQjnKxet+4ebbi8yerfQ2841Tuv+tw3kBA8M8tJYANa6mVPrT4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cachyos.org; spf=pass smtp.mailfrom=cachyos.org; dkim=pass (2048-bit key) header.d=cachyos.org header.i=@cachyos.org header.b=AQClqLbh; arc=none smtp.client-ip=202.61.224.105 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cachyos.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cachyos.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cachyos.org header.i=@cachyos.org header.b="AQClqLbh" Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 66FB0281218; Fri, 10 May 2024 20:24:26 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cachyos.org; s=dkim; t=1715365470; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:content-language:in-reply-to:references; bh=ybmvvQyExEwEgsu2RTsdpAgQWSkXrD6bkqceyhjyk3k=; b=AQClqLbhftsrsi/Sui+eXyyuxaFbm7Jy7wpyx53OqD7Mt+jHHF63RTUDBfJz2VCGOHwztX eUKagC8zsDpojQRGCy/8oto2Zio/+6BqsXaVG473Ub7G8Xkw25LBuBlktMBqhNtHjGYsPb KTUYW7bAj23aNNnQY8Kzdg5k+scytXM237fwpXrrrlMEHdFfRfrFwPgErpJ3WWr1H1Fwvk h09rCWApQFn1JpuGEB1LAzKX8HWkBuTJwGGftsHLlTtFVs4G35K7i1pHJYc7NL02/6al4K wKlIL0dP9cm5aFYpUAsPzEKU8cDtsPVRmCZaUAE5JuC/FUkMWOM6fc5v04vf1A== Message-ID: Date: Fri, 10 May 2024 20:24:26 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCHSET v6] sched: Implement BPF extensible scheduler class To: Tejun Heo , torvalds@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@kernel.org, joshdon@google.com, brho@google.com, pjt@google.com, derkling@google.com, haoluo@google.com, dvernet@meta.com, dschatzberg@meta.com, dskarlat@cs.cmu.edu, riel@surriel.com, changwoo@igalia.com, himadrics@inria.fr, memxor@gmail.com, andrea.righi@canonical.com, joel@joelfernandes.org Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, kernel-team@meta.com References: <20240501151312.635565-1-tj@kernel.org> Content-Language: en-US From: Peter Jung Organization: CachyOS In-Reply-To: <20240501151312.635565-1-tj@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Last-TLS-Session-Version: TLSv1.3 Hi everyone, We (CachyOS [0]) want to support to proposal of sched_ext. CachyOS is an archlinux based distribution, which improves the performance, throughput and interactivity for the desktop but also on servers. We have a big community, which likes testing new features on the kernel, GPU drivers, frequency drivers, new locking technologies and schedulers. [0]: https://cachyos.org/ For CachyOS, schedulers have always been a key matter. We have numerous variants of kernels with different schedulers so that everyone can be satisfied. So far, schedulers in the kernel have faced one problem, namely: 1 kernel = 1 scheduler. It was impossible to change the CPU scheduler without restarting the computer and booting another kernel. scx-scheduler simply and extremely successfully changes this approach and allows you to change schedulers at runtime. The approach with a single default scheduler in the kernel also leads to a problematic situation, because in our opinion it is impossible to develop a single scheduler that is the optimal solution for all possible tasks. Again, and in this case, scx-scheds makes this problem obsolete. The EEVDF Scheduler gives a good overall experience, but it currently lacks good interactivity under load, specific scenarios like gaming and also the latency. Rusty gives CachyOS currently a very good replacement for desktop usage. We are planning to provide the Rusty Scheduler in the future as default. The interactivity of Rusty is dramatically better than EEVDF, especially when a heavy workload is running in the background, e.g. during compilation. Using the desktop under such a workload can be very challenging for the default scheduler and at rusty it is not even noticeable that during compilation is running. Also in gaming scenarios rusty seems to provide excellent performance. The LAVD Scheduler is integrated as default in our handheld variant and shows very good impressive results in frame times as well as 1% lows. This gives our user on the Handheld Edition a better experience. It is also worth mentioning that our community takes an active part in sched-ext testing and regularly reports bugs and suggestions for changes. Cooperation with developers is also perfect - they immediately make corrections if there are any regressions. Regards, Peter Jung CachyOS