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 E9DE618560A for ; Tue, 9 Jul 2024 21:10:07 +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=1720559409; cv=none; b=XNZXPN0afn9QQweLo3EkxrZQBUDr/7+yPp4WIrkmEhft9aFZGaNXTAcUHjeCmG1D69BfjbFKGIZsmz0g3ALbMA21XIodEUhYkWvQb42BGqzLqAeJJomfpdWVioT/Z3HIVTopGJJZUMw4QftCLbdywxHgRg6rsWeNaG3JBsFk6Uc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720559409; c=relaxed/simple; bh=p3D+YYIBhZMl0KHbIiV2WnqcwM7wCCxOcRk9UL85e8Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=lnIc6BoPHmlzuyF26vE8ygm6fwx+LeSZ06Y6h2RhSUHmRGxCHQ02j2LS4jSrtIbDLOZ7Vx7zcV7F341p4pmdszkuIkD8Pp5hRoIxlrmqd19nW7iI5eEmZ80WnM8ufGucocYo94SyV8OEjtNIPQh4xLM+esOw0Y+wRigxU6/HavY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=WF5N3Xh3; arc=none smtp.client-ip=209.85.214.177 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="WF5N3Xh3" Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-1fb3cf78ff3so37835435ad.0 for ; Tue, 09 Jul 2024 14:10:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1720559407; x=1721164207; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:sender:from:to:cc:subject:date:message-id:reply-to; bh=lhVn+Ku7OQEDXxxMU9b9vNeQGhvJasTHjIewL8mjYK0=; b=WF5N3Xh3Wo/criWUlf5t3HXNU25I7pzklLZs5/e4eP7riUWiRnoGlgpAs77eImHi6T UTfKQNVi0PJAl/RlfY/4kX/nf2Fuq/ibtJYS+KgG8Oau9J3e5XctDUB/8D+io7AIImCd FodRDPzAWzCH6hplu84UDutTn4/tC+tctIks36HsAsVXCyP0CFiCpc1zsap7PYUqKO2Z euwUE5tX2vaFb0jRoEjqT6dKR7T7zoaEyt5E03vmUVSrbDFIMQcBnrt1sPGvqLhZk8eJ HpDOI+xVhO1N9AFJB8Al0gfa54JPnzcn6SzGH+4JgckOuMjrC9z8gDfnZAC5N+gONvxe 7O3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720559407; x=1721164207; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:sender:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=lhVn+Ku7OQEDXxxMU9b9vNeQGhvJasTHjIewL8mjYK0=; b=Brx09rpxFm+8M948q1fOxRks+Sf9LreLaIuPvA7vXVRv15kWiF8ohCgPXfN4W4a56z HUVkvWbK0cwUZuoXx19Za6+NkqGGbwg0cgB/IjXD6P1KZ82aPlRzgsRkNEZ6bMZfSSiT wy5seHQoyxYZqgZtrB7M/e6wWn/xEEosSISvAhosEAq9wobjs6VwiAA73VD55uOsEUw8 V6NKo8Ys5n6XVSCddB6UNppmckJWGmE4d/uXTjhfy7sJ832gFoA+K3I3dNAmoFlFZ/0p nsaXZpoTh8tc7k2BnvB7Q/1vrvY5AbUqoWTr7DyzfVF90JLnm79ghL19vuKBWeSZroHX kErA== X-Gm-Message-State: AOJu0YzlYd7BTuXI2W08rehvOLaWjLwSh3oVI4uLVvLLiYlHEdVdwpD6 YmGcDWw3smGMlYPrBoqCkMwfuKvxgJryIXNITAYGCi1pFeGsPFgHixC6vg== X-Google-Smtp-Source: AGHT+IG7ceVmjhDGGvB2y9Rwwl8RPAi9Vh/TaLRAmMWs4JbmUEdS0dW8D93yOOlf2aBfha7YTVjtSA== X-Received: by 2002:a17:902:f645:b0:1f6:fcd9:5b86 with SMTP id d9443c01a7336-1fbb6ce51e0mr32638935ad.12.1720559407094; Tue, 09 Jul 2024 14:10:07 -0700 (PDT) Received: from localhost (dhcp-141-239-149-160.hawaiiantel.net. [141.239.149.160]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fbb6a2acbasm20521565ad.81.2024.07.09.14.10.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jul 2024 14:10:06 -0700 (PDT) Sender: Tejun Heo From: Tejun Heo To: void@manifault.com Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, schatzberg.dan@gmail.com Subject: [PATCHSET sched_ext/for-6.11] sched_ext: Fix scx_bpf_reenqueue_local() Date: Tue, 9 Jul 2024 11:09:41 -1000 Message-ID: <20240709211001.1198145-1-tj@kernel.org> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Fix scx_bpf_reenqueue_local()'s misbehaviors in two cases: - when SCX_ENQ_HEAD is used to dispatch a re-enqueued task back to the same local DSQ. - when the CPU is being preempted by stop_task for task migration. This patchset contains the following two patches: 0001-sched_ext-Reimplement-scx_bpf_reenqueue_local.patch 0002-sched_ext-Make-scx_bpf_reenqueue_local-skip-tasks-th.patch and is also available in the following git branch: git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git scx-fix-reenqueue_local diffstat follows. Thanks. kernel/sched/ext.c | 40 +++++++++++++++++++++++++++------------- 1 file changed, 27 insertions(+), 13 deletions(-) -- tejun