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 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 Tue, Jul 22, 2025 at 09:48:18AM +1000, Balbir Singh wrote: > On 7/18/25 14:57, Matthew Brost wrote: > > On Fri, Jul 18, 2025 at 01:57:13PM +1000, Balbir Singh wrote: > >> On 7/18/25 09:40, Matthew Brost wrote: > >>> On Fri, Jul 04, 2025 at 09:34:59AM +1000, Balbir Singh wrote: > >> ... > >>>> > >>>> The nouveau dmem code has been enhanced to use the new THP migration > >>>> capability. > >>>> > >>>> Feedback from the RFC [2]: > >>>> > >>> > >>> Thanks for the patches, results look very promising. I wanted to give > >>> some quick feedback: > >>> > >> > >> Are you seeing improvements with the patchset? > >> > > > > We're nowhere near stable yet, but basic testing shows that CPU time > > from the start of migrate_vma_* to the end drops from ~300µs to ~6µs on > > a 2MB GPU fault. A lot of this improvement is dma-mapping at 2M > > grainularity for the CPU<->GPU copy rather than mapping 512 4k pages > > too. > > > >>> - You appear to have missed updating hmm_range_fault, specifically > >>> hmm_vma_handle_pmd, to check for device-private entries and populate the > >>> HMM PFNs accordingly. My colleague François has a fix for this if you're > >>> interested. > >>> > >> > >> Sure, please feel free to post them. > >> > >>> - I believe copy_huge_pmd also needs to be updated to avoid installing a > >>> migration entry if the swap entry is device-private. I don't have an > >>> exact fix yet due to my limited experience with core MM. The test case > >>> that triggers this is fairly simple: fault in a 2MB device page on the > >>> GPU, then fork a process that reads the page — the kernel crashes in > >>> this scenario. > >>> > >> > >> I'd be happy to look at any traces you have or post any fixes you have > >> > > > > I've got it so the kernel doesn't explode but still get warnings like: > > > > [ 3564.850036] mm/pgtable-generic.c:54: bad pmd ffff8881290408e0(efffff80042bfe00) > > [ 3565.298186] BUG: Bad rss-counter state mm:ffff88810a100c40 type:MM_ANONPAGES val:114688 > > [ 3565.306108] BUG: non-zero pgtables_bytes on freeing mm: 917504 > > > > I'm basically just skip is_swap_pmd clause if the entry is device > > private, and let the rest of the function execute. This avoids > > installing a migration entry—which isn't required and cause the > > crash—and allows the rmap code to run, which flips the pages to not > > anonymous exclusive (effectively making them copy-on-write (?), though > > that doesn't fully apply to device pages). It's not 100% correct yet, > > but it's a step in the right direction. > > > > > Thanks, could you post the stack trace as well. This is usually a symptom of > not freeing up the page table cleanly. > Did you see my reply here [1]? I've got this working cleanly. I actually have all my tests passing with a few additional core MM changes. I'll reply shortly to a few other patches with those details and will also send over a complete set of the core MM changes we've made to get things stable. Matt [1] https://lore.kernel.org/linux-mm/aHrsdvjjliBBdVQm@lstrano-desk.jf.intel.com/ > Do you have my latest patches that have > > if (is_swap_pmd(pmdval)) { > swp_entry_t entry = pmd_to_swp_entry(pmdval); > > if (is_device_private_entry(entry)) > goto nomap; > } > > in __pte_offset_map()? > > Balbir Singh