From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (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 5CA463A8FF6 for ; Fri, 6 Mar 2026 14:03:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772805813; cv=none; b=J7Bb3MVR0YdY4lc50Yle4qDK2xvo8ni88Oe2/wXZmd13d7rpTCM7prkr+QzjmsszPunA1OGqkRP4zowwpQ6Jx2idcB/Ho2jleSKDmT475z/iAZX0wA5v1s3WWvXsO3qUs5g3irGHthAvEW3fJtAKVUgWn3QlINlLao290kt01sQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772805813; c=relaxed/simple; bh=yKSrxm0w7R7rf8DwTeSORUdpLC62zlDW3KpKzJo1uZY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=HofnAVdCSo3JXeuO28bOOBUda7xiQ/bSGXZZ03UvMoYjJmW+Y5IkyZKgnVt6Bn20L7vJPXgD1z1TZtRVtPjssypHlvkffdKoR6MclWGI/bmp2cvQv/AhugM0GSKcdwTiXZTxAnTZ57VaWsYF6LoNe13gnrlNCgbuLkd8gEawuE0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=eQNQ4AAz; arc=none smtp.client-ip=209.85.214.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com 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="eQNQ4AAz" Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-2ab077e3f32so40991095ad.3 for ; Fri, 06 Mar 2026 06:03:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1772805812; x=1773410612; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=InKX+d5TOMIn4QLgyy6Fu4JN4MhM87tVHkjnRlVwYog=; b=eQNQ4AAzvn+Itz+x4WSH+3mNbJIl7yneMjQmoSNJPwW/gPyN5zsp1GVh+MceHVqbDq 1WHfiSTYz2B7s857TW3dffgVIrHPc68oZV5u2YyoVY08avcRW4kOZJvXWMa2ZO7OAzk8 ma5aUib+qWvDkZlaOGwics8u4U1HE/hkyfhwgjbaLWvkBO6XXZQq42r/35GIXAsyUEH3 wk8gvYcveBOPwD14aZOeldNjEWoFHL22bu0FCzsI1CIMq1jSUnQT3kWXyHOfarI+c1Yp ZzDwSaG4GtcYh6FdotE3E2jyFdJgClGvHi2aaq4PJDirWvxRfFaiWIK75CEUAr1UV9Ko TB/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772805812; x=1773410612; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=InKX+d5TOMIn4QLgyy6Fu4JN4MhM87tVHkjnRlVwYog=; b=TA+e4pOCWgdO5NLz5Q0dcq82ZiycfG4+4NulJXwxuchjnAq6DHSGNMfy2bXL2VgGVi uCzqWU897qHb/Ku7gETX4PJAy8HblNTq1yNVO8dMW1RfHfoL4pYLYXgfQ9bMMjzklpkp imt2QDRewtIJmft1aaWripe10LyA8XuDXSa4jhvzyEEYw4TKdfZZE/cIuSoGkmq8ONfX b+iJtttdoDIOFQ6LdnlMqWxZ18MA2+YNGcxIHm0qvrbdybdsVy4X5wdbyvpqKbUvUjHB 8e1NZKpwHE6iEF7ZvIv7yl7J4sqfigAs82MAH88Xwr+QRYXwosQkk5zQhbv+ju94+mox 2Ktw== X-Forwarded-Encrypted: i=1; AJvYcCVk8zYD2G58D8LLzRKaAxUg/k+tWkyto9f2y/3INq9n8ipHrCdfS+zt1peStUfR/jP0sCFo+47K62pQg5o=@vger.kernel.org X-Gm-Message-State: AOJu0YzmiHKq7rOGe40oPitDbjzBV2VE63mhBP+dv8v/rcorbz51W6Yv rYTOssitW7nKOKDxyTq3mnLHGjotTKnjFylMhY0aen6I1VnuF74SWhkkYi3sWWzl X-Gm-Gg: ATEYQzza/FUsFgFCbyo9L2iPO4UT6l9Q4mItG9kMiVnJ0hh+vMdO+3rqnsbmg/SQ7Q6 hMjdN65M3bGustCiz8brq6o0qu+6uWrnSk8bDqP9wJtYjHOUQ2qIa8B/sSo3AEvyNQNaHCIj4dA p+rpAuxB9p1z67/DtQvdKrH5wob0rMdPk4+ioI9rM3p8yl59NwWr0a4l122vipeIxU1Sbe7TOFQ x+VIXB2pVSoe3dZK1IlgbEy62DiOd74pjZzn7tvw1C8G+JVd/GWMlL1NemQ6OcktYltIGV9rplt 5aD2vIFFuKmwQZ8VuB6/vP1NT9giLka0d79ooWbpPJsdGMHoi8ZqtkhHXirjane1pbnlEUgeb6S 3QkCzf0fOoqzE1emnxyqlWCDzqhAZb/KS/PkuS4fKgTJjuwhe5lon4gtdJ2ZuWufIdsC+JlxXy1 9HjwKxgPQMzEejtb6plZhA4o4GJXKy2nAOEjL0wr1etzmryjCBuUqgRHBZKXscUIUcFuogvdeDy E8= X-Received: by 2002:a17:902:c401:b0:2ad:9b86:ddc2 with SMTP id d9443c01a7336-2ae82455273mr25656635ad.22.1772805811507; Fri, 06 Mar 2026 06:03:31 -0800 (PST) Received: from mi-HP-ProDesk-680-G6-PCI-Microtower-PC.mioffice.cn ([43.224.245.226]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ae840ccb6csm29134715ad.92.2026.03.06.06.03.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Mar 2026 06:03:31 -0800 (PST) From: zhidao su X-Google-Original-From: zhidao su To: tj@kernel.org, sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org Cc: void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, linux-kselftest@vger.kernel.org, Su Zhidao Subject: [PATCH 0/5] sched_ext: bypass state machine cleanup and selftest Date: Fri, 6 Mar 2026 22:03:20 +0800 Message-ID: <20260306140325.2710927-1-suzhidao@xiaomi.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Su Zhidao This series does a small cleanup pass on the sched_ext bypass code path and adds a selftest for the bypass mechanism. Patch 1 removes SCX_OPS_HAS_CGROUP_WEIGHT, which was marked deprecated in 6.15 with a "will be removed on 6.18" comment. We are now past that point. Patches 2-3 improve the bypass code in ext.c: add inline comments explaining the bypass depth counter semantics and the dequeue/enqueue re-queue loop, and replace rcu_dereference_all() with the more precise rcu_dereference_bh() in scx_bypass_lb_timerfn() which runs in softirq context. Patch 4 adds a selftest that verifies forward progress under bypass mode: worker processes are spawned while the scheduler is active, then bpf_link__destroy() is called (triggering bypass), and the test confirms all workers complete successfully. Patch 5 adds a comment to the scx_bypass_depth declaration noting its planned migration into struct scx_sched. Tested on 6.18.7 with CONFIG_SCHED_CLASS_EXT=y; all existing selftests pass. Su Zhidao (5): sched_ext: Remove deprecated SCX_OPS_HAS_CGROUP_WEIGHT flag sched_ext: Add comments to scx_bypass() for bypass depth semantics sched_ext: Use rcu_dereference_bh() in scx_bypass_lb_timerfn() sched_ext/selftests: Add bypass mode operational test sched_ext: Document scx_bypass_depth migration path kernel/sched/ext.c | 29 ++++- kernel/sched/ext_internal.h | 8 +- .../sched_ext/include/scx/enum_defs.autogen.h | 1 - tools/sched_ext/scx_flatcg.bpf.c | 2 +- tools/testing/selftests/sched_ext/Makefile | 1 + .../testing/selftests/sched_ext/bypass.bpf.c | 32 ++++++ tools/testing/selftests/sched_ext/bypass.c | 105 ++++++++++++++++++ 7 files changed, 165 insertions(+), 13 deletions(-) create mode 100644 tools/testing/selftests/sched_ext/bypass.bpf.c create mode 100644 tools/testing/selftests/sched_ext/bypass.c -- 2.43.0