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Fri, 13 Mar 2026 20:22:25 -0400 X-MC-Unique: 5ieO_G_cPgSDUQ_rrj16QQ-1 X-Mimecast-MFC-AGG-ID: 5ieO_G_cPgSDUQ_rrj16QQ_1773447742 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5E8CD195399E; Sat, 14 Mar 2026 00:22:21 +0000 (UTC) Received: from gmail.com (unknown [10.72.112.67]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5CC01180058B; Sat, 14 Mar 2026 00:22:10 +0000 (UTC) Date: Sat, 14 Mar 2026 08:22:05 +0800 From: Chunyu Hu To: "Lorenzo Stoakes (Oracle)" Cc: Mike Rapoport , akpm@linux-foundation.org, david@kernel.org, shuah@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev Subject: Re: [PATCH 0/4] selftests/mm: skip several tests when thp is not available Message-ID: References: <20260312114027.634559-1-chuhu@redhat.com> <68b17560-3033-472c-9638-a2e2058529f8@lucifer.local> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <68b17560-3033-472c-9638-a2e2058529f8@lucifer.local> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 On Fri, Mar 13, 2026 at 03:40:14PM +0000, Lorenzo Stoakes (Oracle) wrote: > On Fri, Mar 13, 2026 at 05:19:20PM +0200, Mike Rapoport wrote: > > On Fri, Mar 13, 2026 at 08:26:02AM +0800, Chunyu Hu wrote: > > > On Thu, Mar 12, 2026 at 04:03:59PM +0200, Mike Rapoport wrote: > > > > On Thu, Mar 12, 2026 at 07:40:23PM +0800, Chunyu Hu wrote: > > > > > There are several tests requires transprarent hugepages, when run on thp > > > > > disabled kernel such as realtime kernel, there will be false positve. > > > > > > > > I presume that when THP tests run on kernels with THP disabled they fail > > > > and it would be a false negative rather than false positive. > > > > > > This is an interesting point. I'm not naitive speaker. I just learned > > > from AI. It really matters what we define as 'postive'. I presume 'postive' > > > is we run selftest and got a failure report, that's postive, not thinking > > > as it's thp disabled kernel and a 'pass' is postive. > > > > I think that a passing test is "positive" and a failing test is "negative". > > So a test that fails because of misconfiguration is a false negative to me. > > (Ostensibly native speaker here :P) > > Yes. > > False positive = the test passed when it should have failed. > False negative = The test failed when it should have passed. Ok. Thank you for clarify. I'll use 'false netative' instead . > > Cheers, Lorenzo >