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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id 5614622812f47-3f667108460sm1429003b6e.41.2025.03.05.13.03.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Mar 2025 13:03:57 -0800 (PST) Date: Wed, 5 Mar 2025 13:03:40 -0800 (PST) From: Hugh Dickins To: Zi Yan cc: Hugh Dickins , Andrew Morton , linux-mm@kvack.org, "Kirill A . Shutemov" , "Matthew Wilcox (Oracle)" , Ryan Roberts , David Hildenbrand , Yang Shi , Miaohe Lin , Kefeng Wang , Yu Zhao , John Hubbard , Baolin Wang , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Kairui Song , Liu Shixin Subject: Re: [PATCH v9 2/8] mm/huge_memory: add two new (not yet used) functions for folio_split() In-Reply-To: <408B0C17-E144-4729-9461-80E8B5D1360C@nvidia.com> Message-ID: <0582f898-bd35-15cc-6b4d-0a3ad9c2a1a4@google.com> References: <20250226210032.2044041-1-ziy@nvidia.com> <20250226210032.2044041-3-ziy@nvidia.com> <2fae27fe-6e2e-3587-4b68-072118d80cf8@google.com> <408B0C17-E144-4729-9461-80E8B5D1360C@nvidia.com> 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 On Tue, 4 Mar 2025, Zi Yan wrote: > On 4 Mar 2025, at 6:49, Hugh Dickins wrote: > > > > I'd been unable to complete even a single iteration of my "kernel builds > > on huge tmpfs while swapping to SSD" testing during this current 6.14-rc > > mm.git cycle (6.14-rc itself fine) - until the last week, when some > > important fixes have come in, so I'm no longer getting I/O errors from > > ext4-on-loop0-on-huge-tmpfs, and "Huh VM_FAULT_OOM leaked" warnings: good. > > This error should be related to the other patch I sent out on using > xas_try_split() in shmem_large_entry_split(). Great to have you confirm > it fixed some of the bugs. > > > > > But I still can't get beyond a few iterations, a few minutes: there's > > some corruption of user data, which usually manifests as a kernel build > > failing because fixdep couldn't find some truncated-on-the-left pathname. > > It is likely that this patch might fix it (partially): > https://lore.kernel.org/linux-mm/56EBE3B6-99EA-470E-B2B3-92C9C13032DF@nvidia.com/. > Andrew has picked it yesterday. No, that's a fix to a truncation issue which I had not hit: I did try adding that patch, but it has not helped in my case. Beyond checking that, I didn't have time yesterday to investigate further, but I'll try again today (still using last weekend's mm.git). Hugh