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b=mS8O7LdlB4rRbIWjF+Ru/oL0KgXE2iC8EIhFSLq6zjbxqntdp5RXsI4g0gvvKYN/o DsjWZq11bDZ707uQpDbPLBzivaiBAbZ6S3qpypIF/SOjMTUZKMGMIpeZZTEaHU9ua6 BxAvW3IbfurZzKGnoMpu5Ev+iDCPo5EctbJEmyGao4+p2gtvnkpaSXdu2puniKbS6Y c3ws46trieNiNQoAeZlIUhsRRw9rkxOGdBZP/3l7JY3dSInIfnVS5u6K+syPeCadNP 7K5BcB+fO/Pox+0S+MdpS/kT03P+vnS7a+tbkRR+T4TWoTR7LETSASUrhNh9RuKBeA FUHR09USFgVtA== From: SeongJae Park To: SeongJae Park Cc: gutierrez.asier@huawei-partners.com, artem.kuzin@huawei.com, stepanov.anatoly@huawei.com, wangkefeng.wang@huawei.com, yanquanmin1@huawei.com, zuoze1@huawei.com, damon@lists.linux.dev, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v1 2/3] mm/damon: introduce DAMON_HUGEPAGE for hot region hugepage collapsing Date: Wed, 17 Jun 2026 17:16:08 -0700 Message-ID: <20260618001609.83965-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260617040452.98621-1-sj@kernel.org> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 6C23D1C0008 X-Stat-Signature: 8ay9nqrnurd7sif1ogyxtn7c76hmn34t X-HE-Tag: 1781741781-502563 X-HE-Meta: U2FsdGVkX18tuu2SxeQjv3O+McSSwRhn1eiH5NnCRyKOk5ugh9+MjqtF5JMzOTsgpo7OJsmiK56T/szcIV8xbv7O+xZRwZcDOEvJpZ+SCltMPdu6p7Uwo2inoLQLgn8R9zw8qunGmtIK/TppiHdWd0VjfsdijH95oEt13CrpfwkKpT9XF5ZHSI1sa/P4B5eWp8urpP+vbunEyCtSU56GBDae98cIFj0r0hx7g4misyzyag46pDUDX3LifBZopH95Vh3RkO18y5WFC3/Nx7L0l65EHwtWPS8N5ac5s+mvS9P97WYBkVJ4+DZnxr9g2DbXdSv+iwauofswZ9slbVQQCxbr5dIz/NrObbd2NdMNK8nI8aVdWUb1+Wsvz16FNWu5u6HGCSqlk8UGloFqrrW3GpqcW+j/i9EPgoW4E0GVA2siypXFu/hO7idF9hd9fWx9PtjreXYwB8hiMZfsCgv0PKByg1V+P9JYmoE9EMSg173HlypS7D/hGqqFXNhbadZ5q2il3cKTR5ewjMkEIYTvXgqxM5a0v8oFMLQXn/TtgdRE07tFTNuQTshskYnSVxw6WcWJ9hdYJFiBHm/IYxFCblBd/OJXNic9mYNcfJEqsollUQcKXj1pw82/j5FVtB63d2wOCh+CEWOnzPYeDK95C681G7NFAsamJ8+b65P3x2xzUioi+zrxuKWOBAK+JxsG8lPf2sPDYziJ32Y9tcgz9OyrUowdq2AS4HBsbIV5ajUID2xb2vwHNB6/cUepqPHl0lOHJPJmBQXpt37smCmjFxnKhHGPx8bcoZ6dg8D3/CmCmO0eNRtduCBj388DdLZjdVe/c961dQrhD+ZnzkP5VWAa0APCUXpZgjBROBJr5Ykj6REaZolWSff3JQcnihHF035aV705uEeQUvzIHLG2zDtHtUtVg2ntUEqZcvImpWwwFtNxyX4KGxsDI5mpw00/w5N3TfVuCAei+9yYDTO 7YtiCYgI S3ML3Ch7WMXbzkj44ZUdlNkH5irwDlxDn1lLoL8uL+XvqBVFUEeYwgX0STddk0jXdZ618wsSBZoc2KwQqAnrCCEBP8Ru/MP16ebWJ6PyDvuQihBoxf3+ZsL8mzfYXXYJWQbeBHj1/H2AF6aVg2PjDr5aS6bzn7arREsZr/gDLGNzgpTbnkcnmzas+yrHLbXlZ50hDjLtsMyEDn7EiVau+WRBeoVX2KnwAPuvvJm7QNRvK0+aPWLAAFpanT80uEQBgmuzlfT4jBDgZLxG9Kz6B1O6IxMny0XMG++uNv0Y12Faqpd4EEMalkWGUDUIw4jD0w9+CYMs3oaBDnQ/B34canZvhiw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 16 Jun 2026 21:04:52 -0700 SeongJae Park wrote: > On Tue, 16 Jun 2026 15:03:15 +0000 wrote: > > > From: Asier Gutierrez > > > > This patch introduces a new DAMON module (SAMPLE_DAMON_HPAGE) > > which collapses hot regions into huge pages. As I mentioned on the previous version of this series, this sample module looks much better than the initial shape to my humble eyes. Much smaller and simpler. I really appreciate Asier's efforts on making this. However... I was asking myself if this module is really needed last night, and still got not real good and confident answer. After all, this is a sample module. The purpose is to show sample code thhat helps people understanding how they can use DAMON API. Maybe we can argue this module can be helpful at understanding how DAMOS quota goal can be used. But, mtier is already showing that. So I cannot say what new advantage this module is really bringing. Meanwhile, this patch adds ~200 lines of code. It is a very small and simple sample module, but still we should maintain it. I, to be honest, getting little bit concerned about the maintenance overhead now. So, if Asier has a good reason to add this module that I'm missing, I'd like to humbly ask to consider dropping of this module for now. I'm so sorry for raising this concern this late. But, Asier, may I ask what do you think? Thanks, SJ [...]