From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 F41CC199FB1 for ; Fri, 30 Aug 2024 11:04:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725015863; cv=none; b=rfOwpqmyJ0kmUQP/ybAP9/QaRFvpyEyDpfOuCltLIL32IFHVUmx5bWc26owfJtCltXZ0ApmZ67x150HKUFIuxfbs6yemYydqmH3t2PIxiz0lAkv+b1HgwZizflSKzM1sTONicw0zJ4ARV4cYfjKmBQFWFdbrzpEtr59Ju5Hi4OY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725015863; c=relaxed/simple; bh=kakPEz8Ef8v8t+WPNdzapM37p3OjYXHmUl3Nyj1uvJA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=r3bpy1QmgWABxtCUGtNXtdDOTp5w67mSJ0j/pmyAxKQAP2oouHy0+2Ofx1E848kXYIILlQXBEG5yVlbWavDWt4OxSLs4A9GJATrjb6i1fnLo80rVjMMCjhC6UByWKhLCYwHv+t9FNDUiHq/HeXdMmd5LThz8RnwDFhcF61Fncg4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TGYw2It3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TGYw2It3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A922C4CEC4; Fri, 30 Aug 2024 11:04:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725015862; bh=kakPEz8Ef8v8t+WPNdzapM37p3OjYXHmUl3Nyj1uvJA=; h=From:To:Cc:Subject:Date:From; b=TGYw2It3RVjbdbb4h2Q+Ns0is5TCQeiLkGLbsM1y6OkrhegvEI72T1XA+Wj7RVgFU fSia/tEEiRcDxjDSy1+VqwXaE+2nY90+OynVg6UMXjZ+UA3WB5a0EPd8ezm7p85M04 a4GZ+KSiLXrTq6nRKBcLj0s80q+X0QDI0HqjxYCEYGnuRvdaSeKTh1bgtoYOVtIqT1 Fnhu+De/HxFvGzpupCx3yOm/044hynu++MtArrt+pafBQnD+oQ2h9K9vYa6GW3XL4C 6e1gdH6vgp/npRw1+iaCMQ7bVHa/ElL3Yqgx76t/EnA9BKU1FzB7dPU2wN+lcPltQ+ ECDD/UlKxJEdw== From: Tejun Heo To: void@manifault.com Cc: kernel-team@meta.com, linux-kernel@vger.kernel.org Subject: [PATCHSET sched_ext/for-6.12] sched_ext: Implement scx_bpf_dispatch[_vtime]_from_dsq() Date: Fri, 30 Aug 2024 01:03:44 -1000 Message-ID: <20240830110415.116090-1-tj@kernel.org> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Once a task is put into a DSQ, the allowed operations are fairly limited. Tasks in the built-in local and global DSQs are executed automatically and, ignoring dequeue, there is only one way a task in a user DSQ can be manipulated - scx_bpf_consume() moves the first task to the dispatching local DSQ. This inflexibility sometimes gets in the way and is an area where multiple feature requests have been made. Implement scx_bpf_dispatch[_vtime]_from_dsq(), which can be called during DSQ iteration and can move the task to any DSQ - local DSQs, global DSQ and user DSQs. The kfuncs can be called from ops.dispatch() and any BPF context which dosen't hold a rq lock including BPF timers and SYSCALL programs. This patchset is on top of: sched_ext/for-6.12 bf934bed5e2f ("sched_ext: Add missing cfi stub for ops.tick") + two fix patches (http://lkml.kernel.org/r/ZtGkPKgoE5BeI7fN@slm.duckdns.org) and is also available at: git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git scx-dispatch_from_dsq This patchset contains the following patches: 0001-sched_ext-Rename-scx_kfunc_set_sleepable-to-unlocked.patch 0002-sched_ext-Refactor-consume_remote_task.patch 0003-sched_ext-Make-find_dsq_for_dispatch-handle-SCX_DSQ_.patch 0004-sched_ext-Make-dispatch_to_local_dsq-return-void.patch 0005-sched_ext-Restructure-dispatch_to_local_dsq.patch 0006-sched_ext-Reorder-args-for-consume_local-remote_task.patch 0007-sched_ext-Move-sanity-check-and-dsq_mod_nr-into-task.patch 0008-sched_ext-Move-consume_local_task-upward.patch 0009-sched_ext-Replace-consume_local_task-with-move_local.patch 0010-sched_ext-Implement-scx_bpf_dispatch-_vtime-_from_ds.patch 0011-scx_qmap-Implement-highpri-boosting.patch 0001-0009 are prep patches. The logic to bounce tasks across DSQs and CPUs is rather complicated due to synchronization. The prep patches do quite a bit of refactoring so that the helpers are more composable and can be used for the new kfuncs. 0010 implements scx_bpf_dispatch[_vtime]_from_dsq(). 0011 adds demo usages to scx_qmap. diffstat follows. Thanks. kernel/sched/ext.c | 592 ++++++++++++++++++++++++++++++++++++---------------------- tools/sched_ext/include/scx/common.bpf.h | 8 tools/sched_ext/scx_qmap.bpf.c | 142 ++++++++++++- tools/sched_ext/scx_qmap.c | 11 - 4 files changed, 519 insertions(+), 234 deletions(-) -- tejun