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Wed, 11 Feb 2026 19:11:44 -0800 (PST) MIME-Version: 1.0 References: <20260203192352.2674184-1-jiaqiyan@google.com> <20260203192352.2674184-3-jiaqiyan@google.com> <5c4927af-120e-4c6b-9473-95490f4fcc90@oracle.com> In-Reply-To: <5c4927af-120e-4c6b-9473-95490f4fcc90@oracle.com> From: Jiaqi Yan Date: Wed, 11 Feb 2026 19:11:33 -0800 X-Gm-Features: AZwV_Qi3lwPEjdm2Mw887DAZh3QRbXiCmUAvRWCHdZdEClqeZBM3MxkXXhz_C-k Message-ID: Subject: Re: [PATCH v3 2/3] selftests/mm: test userspace MFR for HugeTLB hugepage To: William Roche Cc: linmiaohe@huawei.com, harry.yoo@oracle.com, jane.chu@oracle.com, nao.horiguchi@gmail.com, tony.luck@intel.com, wangkefeng.wang@huawei.com, willy@infradead.org, akpm@linux-foundation.org, osalvador@suse.de, rientjes@google.com, duenwen@google.com, jthoughton@google.com, jgg@nvidia.com, ankita@nvidia.com, peterx@redhat.com, sidhartha.kumar@oracle.com, ziy@nvidia.com, david@redhat.com, dave.hansen@linux.intel.com, muchun.song@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 76B52C0002 X-Stat-Signature: uinz7ck48dkuzgork3tg5ijzc7ba87si X-Rspam-User: X-HE-Tag: 1770865906-940724 X-HE-Meta: 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 OGxyfFew xJYBCsLhdQwodiK/7M39L396nIviVb3EUXxQXOMe1SUrsyU2EkdqXCtXJsqdogzB0lrw5n2aO/e6CpptPBx/X7L/M/ELTKZ59wzR7drLUUsRHrJZRkbez8BwEY/df1PpQtJUfbPOelLEmLqBmBDlKqzleAdunVpXxhnYMIau2xFRirjCKeBGTjc7WtcjH8lWwS5PiMLLOgbBnsTc+5KwyzlcDLcBhLT/rO+V8IQIVG3o2qMRJ30t76tONoQOmdMXYLvUBGvKWRoOyKQySYnJF0nCAkUF9fcb7MScY7M9WKeH9yc9THtN4a1OMvKMy3hK0XUL49R1Cpl8IbAM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Feb 4, 2026 at 9:53=E2=80=AFAM William Roche wrote: > > > On 2/3/26 20:23, Jiaqi Yan wrote: > > Test the userspace memory failure recovery (MFR) policy for HugeTLB: > > > > 1. Create a memfd backed by HugeTLB and had MFD_MF_KEEP_UE_MAPPED set. > > > > 2. Allocate and map 4 hugepages to the process. > > > > 3. Create sub-threads to MADV_HWPOISON inner addresses of the 1st hugep= age. > > > > 4. Check if the process gets correct SIGBUS for each poisoned raw page. > > > > 5. Check if all memory are still accessible and content valid. > > > > 6. Check if the poisoned hugepage is dealt with after memfd released. > > > > Two configurables in the test: > > > > - hugepage_size: size of the hugepage, 1G or 2M. > > > > - nr_hwp_pages: number of pages within the 1st hugepage to MADV_HWPOISO= N. > In this version, you are introducing this new test argument > "nr_hwp_pages" to indicate how many of the pre-defined offsets we want > to poison inside the hugepage (between 1 and 8). > But is there any advantage to give the choice to the user instead of > testing them all ? Yeah, nr_hwp_pages doesn't seem very useful. It was useful when I want the test to run in two modes: single page vs multple pages. Let me just make the test to testing 8 pages. > > As a suggestion, should we have this test program setting or verifying > the minimal number of hugepages of the right type, instead of relying on > the user to set them manually ? Yeah, I agree, we can just run for 2 different hugepagesize. > And at the end, should we try to unpoison the impacted pages ? So that > the lab machine where the tests run can continue to use all its memory ? Good point, we can include this as a test cleanup step. > > Thanks for your feedback, > William. >