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[2003:d8:2f12:1b00:5d6b:db26:e2b7:12]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45382349758sm17255505e9.9.2025.06.25.04.27.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Jun 2025 04:27:19 -0700 (PDT) Message-ID: <6179dd30-5351-4a79-b0d6-f0e85650a926@redhat.com> Date: Wed, 25 Jun 2025 13:27:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/4] mm: Support batched unmap for lazyfree large folios during reclamation To: Barry Song <21cnbao@gmail.com> Cc: Lance Yang , akpm@linux-foundation.org, baolin.wang@linux.alibaba.com, chrisl@kernel.org, kasong@tencent.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, lorenzo.stoakes@oracle.com, ryan.roberts@arm.com, v-songbaohua@oppo.com, x86@kernel.org, ying.huang@intel.com, zhengtangquan@oppo.com, Lance Yang References: <2c19a6cf-0b42-477b-a672-ed8c1edd4267@redhat.com> <20250624162503.78957-1-ioworker0@gmail.com> <27d174e0-c209-4851-825a-0baeb56df86f@redhat.com> <938c4726-b93e-46df-bceb-65c7574714a6@linux.dev> <5ba95609-302b-456a-a863-2bd5df51baf2@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: AD92D80004 X-Stat-Signature: oj571ks6mo4q9azn55h7sb94t5rrdi85 X-HE-Tag: 1750850843-259346 X-HE-Meta: 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 5KG+6q+r Vld/vHlrpFCP2H055Xb66jfUq2FcEQWXl1uzrMI8spIJ0ASjkEu3a9YZzTREqMtPpf66sz/Xqz4eEKuI6qsOa7LktkiAXcY0p45GOXobyVdX1eLFUGCoA2im13iBtCkdu06HAebHi1IK5c9ekl0hNBytpVd2isj7c/VDOUeehZCq/Sdfbarjbts3ckISjYrWBY19p+4za/m4KpuYVqC4wtOosD48tefKpFwJbuRSPvyUK6JjtFmvAO/YPnfGGuFaMpVdA9ImmwKgCXc8YkNuNT0Rl6ZecdETHIuhWA56FqUg1MInRKw0BdPkHfMefJp5k3nWtZR/YSC5Bz5fKy5WkK9DKGXp9PbKLTxjLMdFnYECMK1fjzXxRnsqSse1+2cJlMPhPihOtRFbG99IAaav+qF32BWa14EYOCV1WpA/dl6UrBaF8StweR2D9QGd+jSUWQxqOBuD0cHP0RfYx6TsrGwiAa7MXr7ITypVM 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 25.06.25 13:15, Barry Song wrote: > On Wed, Jun 25, 2025 at 11:01 PM David Hildenbrand wrote: >> >> On 25.06.25 12:57, Barry Song wrote: >>>>> >>>>> Note that I don't quite understand why we have to batch the whole thing >>>>> or fallback to >>>>> individual pages. Why can't we perform other batches that span only some >>>>> PTEs? What's special >>>>> about 1 PTE vs. 2 PTEs vs. all PTEs? >>>> >>>> That's a good point about the "all-or-nothing" batching logic ;) >>>> >>>> It seems the "all-or-nothing" approach is specific to the lazyfree use >>>> case, which needs to unmap the entire folio for reclamation. If that's >>>> not possible, it falls back to the single-page slow path. >>> >>> Other cases advance the PTE themselves, while try_to_unmap_one() relies >>> on page_vma_mapped_walk() to advance the PTE. Unless we want to manually >>> modify pvmw.pte and pvmw.address outside of page_vma_mapped_walk(), which >>> to me seems like a violation of layers. :-) >> >> Please explain to me why the following is not clearer and better: > > This part is much clearer, but that doesn’t necessarily improve the overall > picture. The main challenge is how to exit the iteration of > while (page_vma_mapped_walk(&pvmw)). Okay, I get what you mean now. > > Right now, we have it laid out quite straightforwardly: > /* We have already batched the entire folio */ > if (nr_pages > 1) > goto walk_done; Given that the comment is completely confusing whens seeing the check ... :) /* * If we are sure that we batched the entire folio and cleared all PTEs, * we can just optimize and stop right here. */ if (nr_pages == folio_nr_pages(folio)) goto walk_done; would make the comment match. > > with any nr between 1 and folio_nr_pages(), we have to consider two issues: > 1. How to skip PTE checks inside page_vma_mapped_walk for entries that > were already handled in the previous batch; They are cleared if we reach that point. So the pte_none() checks will simply skip them? > 2. How to break the iteration when this batch has arrived at the end. page_vma_mapped_walk() should be doing that? -- Cheers, David / dhildenb