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[209.85.221.47]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a6e23c9f22asm634070166b.171.2024.06.11.14.35.33 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Jun 2024 14:35:34 -0700 (PDT) Received: by mail-wr1-f47.google.com with SMTP id ffacd0b85a97d-35dc1d8867eso4864057f8f.0 for ; Tue, 11 Jun 2024 14:35:33 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCUHfAO1e1orvC4pKhFMCZL+2Kf5UvJ2OBth0CmAF89Te3oGEsHaLWTIYzCzkO3cJtrgK9B4yUSdsVp+aD++sNvor112 X-Received: by 2002:a17:906:191b:b0:a69:2288:41da with SMTP id a640c23a62f3a-a6cd6665bc9mr812670466b.30.1718141712971; Tue, 11 Jun 2024 14:35:12 -0700 (PDT) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240501151312.635565-1-tj@kernel.org> In-Reply-To: <20240501151312.635565-1-tj@kernel.org> From: Linus Torvalds Date: Tue, 11 Jun 2024 14:34:56 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCHSET v6] sched: Implement BPF extensible scheduler class To: Tejun Heo Cc: 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, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, kernel-team@meta.com Content-Type: text/plain; charset="UTF-8" [ Tejun reminded me about this, and discussion hasn't really gone anywhere for much too long, so now I just need to be the person who makes a decision and people can hate on ] On Wed, 1 May 2024 at 08:13, Tejun Heo wrote: > > This is v6 of sched_ext (SCX) patchset. > > During the past five months, both the development and adoption of sched_ext > have been progressing briskly. Here are some highlights around adoption: [...] I honestly see no reason to delay this any more. This whole patchset was the major (private) discussion at last year's kernel maintainer summit, and I don't find any value in having the same discussion (whether off-list or as an actual event) at the upcoming maintainer summit one year later, so to make any kind of sane progress, my current plan is to merge this for 6.11. At least that way, we're making progress, and the discussion at KS 2024 can be about my mental acuity - or lack thereof - rather than about rehashing the same thing that clearly made no progress last year. I've never been a huge believer in trying to make everybody happy with code that is out of tree - we're better off working together on it in-tree. And using the "in order to accept this, some other thing has to be fixed first" argument doesn't really work well either (and _that_ has been discussed for over a decade at various maintainer summits). Maybe the people who have concerns about this can work on those concerns when it's in-tree. I'm also not a believer in the argument that has been used (multiple times) that the BPF scheduler would keep people from participating in scheduler development. I personally think the main thing that keeps people from participating is too high barriers to participation. Anyway, this is the heads-up to Tejun to please just send me a pull request for the next merge window. And for everybody else as a "It's happening" heads-up. [ Please just mentally insert the "IT'S HAPPENING" meme gif here - because if I actually were to include it here, lkml would just reject this email. Sometimes the anti-html rules don't work in our favor ]. Linus