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Received: from 30.97.56.56(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0W8lP5Gt_1718760499) by smtp.aliyun-inc.com; Wed, 19 Jun 2024 09:28:20 +0800 Message-ID: <475f0f2c-afc7-4225-809f-93c93f45c830@linux.alibaba.com> Date: Wed, 19 Jun 2024 09:28:19 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/9] support large folio swap-out and swap-in for shmem To: Andrew Morton Cc: hughd@google.com, willy@infradead.org, david@redhat.com, wangkefeng.wang@huawei.com, chrisl@kernel.org, ying.huang@intel.com, 21cnbao@gmail.com, ryan.roberts@arm.com, shy828301@gmail.com, ziy@nvidia.com, ioworker0@gmail.com, da.gomez@samsung.com, p.raghav@samsung.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240618130538.ffab3ce1b4e66e3ba095d8cf@linux-foundation.org> From: Baolin Wang In-Reply-To: <20240618130538.ffab3ce1b4e66e3ba095d8cf@linux-foundation.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: E070F140004 X-Stat-Signature: 8gw764pu5se19mwbafzedqu5yp6sdcec X-Rspam-User: X-HE-Tag: 1718760504-814068 X-HE-Meta: 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 ZDfTDxBO GT8+4X6KucDpyBKnkw0kekVHIyfOLn9PdTY+KQoSK8nqrvnBx7ohgZo4eOIwfUoEr7/b94aTKa1gC5qfnXaG+eEnEPjx0kDdlHiJdD8l2cGwHEOTwAH9YX1qIAzGrpT2dfrUSdRLlQINW0OzUxUJqIs7b8Q7AVvlX4D2JhPE3oDUufIgEiG9zHC+KW93SSsJDhr5IOdUM6/6Uoimjn4h9FVh+e28nVSEXGrInN552oLNXQaNjAFxGGuHbVnvrWuvE2lmAn1pcmXUWqkIXDD9Pc3wovqGZUodX/LNTqb42h/VwsqC+ywgH0HR96qE6q83XPyXu 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 2024/6/19 04:05, Andrew Morton wrote: > On Tue, 18 Jun 2024 14:54:12 +0800 Baolin Wang wrote: > >> Shmem will support large folio allocation [1] [2] to get a better performance, >> however, the memory reclaim still splits the precious large folios when trying >> to swap-out shmem, which may lead to the memory fragmentation issue and can not >> take advantage of the large folio for shmeme. >> >> Moreover, the swap code already supports for swapping out large folio without >> split, and large folio swap-in[3] series is queued into mm-unstable branch. >> Hence this patch set also supports the large folio swap-out and swap-in for >> shmem. > > I'll add this to mm-unstable for some exposure, but I wonder how much > testing it will have recieved by the time the next merge window opens? Thanks Andrew. I am fine with this series going to 6.12 if you are concerned about insufficient testing (and let's also wait for Hugh's comments). Since we (Daniel and I) have some follow-up patches that will rely on this swap series, hope this series can be tested as extensively as possible to ensure its stability in the mm branch.