From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 7EB023C5833 for ; Mon, 6 Jul 2026 23:40:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783381250; cv=none; b=WcxfmAvTWsx2KVj2/ooqeY0BRfQbiSZ8Fdl8VQNjvsSMeV/Zpk9JW5u61QPS5piKv4qKBbmePX6Jbqdu2g67XPrnf0Bwmwz9rsl6XoS2m3aCTpjnMWLiT91V7462fdwrslI00zSSRpeo8z32zB4ZymPLUNkROdgMaFeFIJ89fSc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783381250; c=relaxed/simple; bh=RLqmv245vQu+3CeFg3i6LZ8ApNaw6cbOEPdDW/f9OCw=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References; b=qMExNKTnCdAfNw8gjqJYp/03FzxueorNaKYaMFZsIFPj8yXGb/lqdF3z/IAFpTk4eDowJPozCdNTxFHPOngjLHzbY1R+/yAQL8Db7WjrxeUr9GFeIFgxkEtKV67n5TQ9cAHG57xhTfmp9LSzXO7550c2E2YoFHrY02/RkodKz2s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QylqnDQ0; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QylqnDQ0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E446C1F00A3A; Mon, 6 Jul 2026 23:40:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783381249; bh=RLqmv245vQu+3CeFg3i6LZ8ApNaw6cbOEPdDW/f9OCw=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=QylqnDQ00S85G89+BOKKrD/TaaoTikbkhtE59L69Tfz08nGi+rnRclT3uTLSICGfF IPco79A9OiuYfbdgaeoqAVAGIo07jStdaqegq0d8WSj18Byh2i77PG0LDNub7alwjf 39Chz2zMTnQE+GVDFhTNJZUuv1o7YHu+qINGOThvPeQB2HrX2z95n4Zrr0Vlp4OCGZ +4E8HNOjOpMir9wf6aaTG6HsFPV5qBunfR7zHthXTalpWDr2Q7N/5Pa+eXXQW6VKUi qwSCMbg6BZv1FbXv2pKusbBhdJwcDBGTxWOm+JVaEB6/O4ExUBUr3LdLhUmHMxBMYV L0M4wFjeHbRQA== Date: Mon, 06 Jul 2026 13:40:48 -1000 Message-ID: <5a4b60d65952874b09fb3c8687033ad4@kernel.org> From: Tejun Heo To: sashiko-bot@kernel.org Cc: sched-ext@lists.linux.dev Subject: Re: [PATCH v2 sched_ext/for-7.3 25/36] sched_ext: Add the SCX_CAP_ENQ_IMMED cap In-Reply-To: <20260706021051.531C31F000E9@smtp.kernel.org> References: <20260706014058.439853-1-tj@kernel.org> <20260706014058.439853-26-tj@kernel.org> <20260706021051.531C31F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: sched-ext@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: On Mon, 06 Jul 2026 02:10:50 +0000, sashiko-bot wrote: > - [High] Migration-disabled tasks can stall indefinitely in a sub-scheduler because scx_bpf_sub_dispatch() skips the sub-scheduler's ops.dispatch() when SCX_CAP_BASE is missing on the CPU. Real, but deferred rather than fixed in v3. A flag-gated skip is the wrong fix - the kernel can't call into every sub on the chance of a migration-disabled task. This folds into a broader punt-up model for cpu-affined tasks under sub-scheds that I'm tracking as a follow-up, not this series.