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 BBACE3002D1; Wed, 25 Feb 2026 05:01:25 +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=1771995685; cv=none; b=nujPY1Bsg9PAN5zY5+8P/yzNJJ94b51U8dbYSX751+b6iAl5SJHqwfi1ICfvrDenpOD5JewIsxGvsx8YClO/CRfFGf2i+C3zLZjXTjNMRet/EQIAweEwbUL2xECp5sfQwyGbQnjUe683c/sfq1hmL2cNEfLKSpZW6t5DwwfjAd4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771995685; c=relaxed/simple; bh=78W9E5VoKOH0MhqlfJeeYcbnJzFOFRCC2/kU4D5M7bA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OYMkBroeKxyDPUo5C6OVyKb4SOfOe8HzGj4W0jyc//0/fVJbCSGzrGX2t3qAM79TeR0Ftgd/7H4t+NSUPe20zN7qmSibe9BaM0UZ97N8N+ze2n9z01y903xEU1Ujqp2DwxeLNfMT56ijLPmDWVnOgYtmQq8CQGtU3Nunw1livAc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SC4hrhtS; 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="SC4hrhtS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63A4AC116D0; Wed, 25 Feb 2026 05:01:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771995685; bh=78W9E5VoKOH0MhqlfJeeYcbnJzFOFRCC2/kU4D5M7bA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SC4hrhtSbbNoySAN0HNOTVBxiWqOWkH3WBDz3wV8Hsm6Ma/4yu+l1jWKElcWdnLat 4omHOAM5W1ihJ2kdtU4A64rnwGMIZAitRNoE58XqCeziyB+thU5ymZhSFnNnrMi6Hp 2Z3fzgZmpZnlkFSFJFz+8NsWv1/cFKKhFwPrD3jlYaasTBDveSudajdPXGtTymOm/f ORuIQihzdpIRDiGlCKpcRvRA9KqHIEzWsVv3M6HBkHUX9BU/ZXQj3cv1pWRc7RgXhj 6Sk/qtFjzkQYt78ia8nk5NdYV/grg3Ksg9O9CuC2x3AmJryJYfWlC2l9wsLCe9FoFz sW8V2V/f75n7A== From: Tejun Heo To: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev Cc: void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, emil@etsalapatis.com, hannes@cmpxchg.org, mkoutny@suse.com, cgroups@vger.kernel.org, Tejun Heo Subject: [PATCH 14/34] sched_ext: Make scx_prio_less() handle multiple schedulers Date: Tue, 24 Feb 2026 19:00:49 -1000 Message-ID: <20260225050109.1070059-15-tj@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225050109.1070059-1-tj@kernel.org> References: <20260225050109.1070059-1-tj@kernel.org> Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Call ops.core_sched_before() iff both tasks belong to the same scx_sched. Otherwise, use timestamp based ordering. Signed-off-by: Tejun Heo --- kernel/sched/ext.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 5d13b9b93249..3d46e6e125c7 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -2805,16 +2805,17 @@ void ext_server_init(struct rq *rq) bool scx_prio_less(const struct task_struct *a, const struct task_struct *b, bool in_fi) { - struct scx_sched *sch = scx_root; + struct scx_sched *sch_a = scx_task_sched(a); + struct scx_sched *sch_b = scx_task_sched(b); /* * The const qualifiers are dropped from task_struct pointers when * calling ops.core_sched_before(). Accesses are controlled by the * verifier. */ - if (SCX_HAS_OP(sch, core_sched_before) && + if (sch_a == sch_b && SCX_HAS_OP(sch_a, core_sched_before) && !scx_rq_bypassing(task_rq(a))) - return SCX_CALL_OP_2TASKS_RET(sch, SCX_KF_REST, core_sched_before, + return SCX_CALL_OP_2TASKS_RET(sch_a, SCX_KF_REST, core_sched_before, NULL, (struct task_struct *)a, (struct task_struct *)b); -- 2.53.0