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 841563DFC7F; Wed, 4 Mar 2026 22:01:35 +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=1772661695; cv=none; b=FxsqynRR/sjkpaA96Fap/iw6qXGleRi/vhUxbjDVXVDwof1ZkNyfSLYFM3REIFhWsWsftHswCRXRnmcTHKMbOKcBb8LoQgx/AEBFfz59hQvz0y1QHPb0ZgLyeErNxPfP2mHra5dxlxI7ADb+bGqASaEUbRzou951hmdBtf7GMoo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772661695; c=relaxed/simple; bh=U8D5kMDpc9Zf5YxxxsPJq+9EBS9dAsqhDXuLkLNOAWc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DisHH4hMY10bRfrhKBV4HQ6TWrQ83pUe3SFLIbJ2P3D3ODoM2C+WQCeG0b6NnJliU57VCEKKX3r7+TZd6DG6cZP3i0kVufMDRRQ+zHLuZq1+bpqxX3OAWNaHV1q9izJrdnScFneOSuv5xz8NMiI2q7IFl1g8kZIv8Z5x9p4KPuE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ErtdqaV1; 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="ErtdqaV1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1FDEFC19425; Wed, 4 Mar 2026 22:01:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772661695; bh=U8D5kMDpc9Zf5YxxxsPJq+9EBS9dAsqhDXuLkLNOAWc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ErtdqaV1Kpq67Ld3mUP0pSgpKdiI6e/ZwY+HoSV/UhL79xfG68PxAadVKizw19L0y 6DVG49JEJEqS8LvhVPwXp7RLHhq8HeGONa6JZda8zvvubwNV5k5y9XbsJ7FzgNePIA woCNBDbd0tj9ws6wWF8K6hgiJ84/lvNsCrlsRMfr/6lh87hq6VTsHtP0d2kY8qaGO4 Uqt1y8UYqDY9yYSxQYsKl+YI0VbZkN+K7QyktNvA3dMJLNeaevj2L+dF2RySfZ1+FN 4E/ICjf9+57AIAghm65alEyOb9+YNo2E1/9niKcDc/Ya1K01A/JC21uM3pd7JF5mcq Rct3nV4DnzTpA== 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, Tejun Heo Subject: [PATCH 14/34] sched_ext: Make scx_prio_less() handle multiple schedulers Date: Wed, 4 Mar 2026 12:00:59 -1000 Message-ID: <20260304220119.4095551-15-tj@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260304220119.4095551-1-tj@kernel.org> References: <20260304220119.4095551-1-tj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@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 4280b639a6e0..54210cef3bc7 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -2809,16 +2809,17 @@ 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