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 6ADC022759C; Thu, 19 Feb 2026 09:07:29 +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=1771492049; cv=none; b=pAU0R3xcMPi/irXh43X2lYT4uYeXgSJ31cj7L+Cz6k6Jcy/qW9iuEjycZfMu4qK6UmM6aqBZVCGFSB2RkABcrkgIoelTPrwCZpXof3UsnBHoDkXf4+PeK1bE1ufR3/rXEkLrS/f6KH75+8oBa3evqBOuOkms9nptf+FXvlT3z/0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771492049; c=relaxed/simple; bh=xfSbSFMOR5WWZYkD/q8j+zwbninOKJZFgeYouvFQ3AE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=O2VU5cybvafRH8JYnGcrTOiia4tie0iCcaKWQrolxgtlZHnO6OFbJnhLMKpi2iFsSsbvAEgiC9MEmqWCvidk88FxSWxzPh+uGoSuQ2yFwZ4imvuVL/as/1aQH/sC8LPr4C/1QEnZCTs5vFvAnV2vIVRcRMtuVKEZQstvMi1HUKE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=o1GqSZMP; 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="o1GqSZMP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6394AC4CEF7; Thu, 19 Feb 2026 09:07:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771492049; bh=xfSbSFMOR5WWZYkD/q8j+zwbninOKJZFgeYouvFQ3AE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=o1GqSZMPrLBpAUuJqza5bmDUQOVrBe3F6G2X89Q+yFPp6HbKLgeegbzCQMYLF8520 HTrLyJ1UYcreRqV8EClqLPD+9cfzx/nWsT0/8i324e0c267AXaxKAmdh3uFk+70knL 4cb/AkERs8BbCeRxozLoV84DS6jgXQ/32HbrNGyG8eoDAx3g/QlCzxLrxY22CbVE3l dnYW8BDqZ61K2ort8T2c1Z/luTvGXoItq8BHs+vJdnQBN4xZVSTPuZj4qFV6pCNpAr BhgwMwQlSP3jDokl3tJEdZZ3oYxd5Aru3ZaR7VIQHBY6/4Afi+kbIOOCNzQjzDvAlD Hv+PPrP+ihZGA== Message-ID: <8a06e724-7def-4c61-b340-ef1b3cd8100b@kernel.org> Date: Thu, 19 Feb 2026 10:07:24 +0100 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/mm: skip migration tests if NUMA is unavailable To: AnishMulay , akpm@linux-foundation.org, shuah@kernel.org Cc: lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260218163941.13499-1-anishm7030@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/18/26 17:39, AnishMulay wrote: > Currently, the migration test asserts that numa_available() returns 0. > On systems where NUMA is not available (returning -1), such as certain > ARM64 configurations or single-node systems, this assertion fails and > crashes the test. Single-node system (my notebook) $ ./migration TAP version 13 1..6 # Starting 6 tests from 1 test cases. # RUN migration.private_anon ... # SKIP Not enough threads or NUMA nodes available # OK migration.private_anon ok 1 migration.private_anon # SKIP Not enough threads or NUMA nodes available # RUN migration.shared_anon ... # SKIP Not enough threads or NUMA nodes available # OK migration.shared_anon ok 2 migration.shared_anon # SKIP Not enough threads or NUMA nodes available # RUN migration.private_anon_thp ... # SKIP Not enough threads or NUMA nodes available # OK migration.private_anon_thp ok 3 migration.private_anon_thp # SKIP Not enough threads or NUMA nodes available # RUN migration.shared_anon_thp ... # SKIP Not enough threads or NUMA nodes available # OK migration.shared_anon_thp ok 4 migration.shared_anon_thp # SKIP Not enough threads or NUMA nodes available # RUN migration.private_anon_htlb ... # SKIP Not enough threads or NUMA nodes available # OK migration.private_anon_htlb ok 5 migration.private_anon_htlb # SKIP Not enough threads or NUMA nodes available # RUN migration.shared_anon_htlb ... # SKIP Not enough threads or NUMA nodes available # OK migration.shared_anon_htlb ok 6 migration.shared_anon_htlb # SKIP Not enough threads or NUMA nodes available # PASSED: 6 / 6 tests passed. # 6 skipped test(s) detected. Consider enabling relevant config options to improve coverage. # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:6 error:0 What numa_available() really checks is if the kernel supports NUMA by trying get_mempolicy(). If that fails with ENOSYS or EPERM. That should mostly (cases we care about) be the case if the kernel is compiled without CONFIG_NUMA. So a better description here would be "On kernels without CONFIG_NUMA, this assertion ..." Given that tools/testing/selftests/mm/config does not include CONFIG_NUMA, I think we want to add here Fixes: 0c2d08728470b ("mm: add selftests for migration entries") Acked-by: David Hildenbrand (Arm) -- Cheers, David