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Wed, 13 Aug 2025 11:52:34 +0800 From: Quanmin Yan To: CC: , , , , , , Subject: [RFC PATCH -next 08/16] Docs/mm/damon/design: document 'address unit' parameter Date: Wed, 13 Aug 2025 13:06:58 +0800 Message-ID: <20250813050706.1564229-9-yanquanmin1@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250813050706.1564229-1-yanquanmin1@huawei.com> References: <20250813050706.1564229-1-yanquanmin1@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.175.113.32] X-ClientProxiedBy: kwepems100002.china.huawei.com (7.221.188.206) To dggpemf200018.china.huawei.com (7.185.36.31) X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 573C940006 X-Stat-Signature: n7keaoesf9rdakogr8f56pp1c4nikaxh X-Rspam-User: X-HE-Tag: 1755057157-227855 X-HE-Meta: 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 DSdxXE98 vT2rFV2C18ngjHkmwydxzVV0hJpB9xY8JXLES3VUIOnhf4sWcJDc4V4cXyehDjJDRlNORk/Im+duZRD+lvAXKrgBCr66+ILaUUkF5Xz49MGq2L/sLCzCxuqJ66xBqlAWw9cnfX/eE7QzXrVfbyoSfBWmBKZglH0d/vFZ4ITBS9PuLFZSIMf1M/jYAIbM4CVRj/I9l 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: From: SeongJae Park Add 'addr_unit' parameter description on DAMON design document. Signed-off-by: SeongJae Park --- Documentation/mm/damon/design.rst | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 03f8137256f5..cffa320ead88 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -67,7 +67,7 @@ processes, NUMA nodes, files, and backing memory devices would be supportable. Also, if some architectures or devices support special optimized access check features, those will be easily configurable. -DAMON currently provides below three operation sets. Below two subsections +DAMON currently provides below three operation sets. Below three subsections describe how those work. - vaddr: Monitor virtual address spaces of specific processes @@ -135,6 +135,18 @@ the interference is the responsibility of sysadmins. However, it solves the conflict with the reclaim logic using ``PG_idle`` and ``PG_young`` page flags, as Idle page tracking does. +Address Unit +------------ + +DAMON core layer uses ``unsinged long`` type for monitoring target address +ranges. In some cases, the address space for a given operations set could be +too large to be handled with the type. ARM (32-bit) with large physical +address extension is an example. For such cases, a per-operations set +parameter called ``address unit`` is provided. It represents the scale factor +that need to be multiplied to the core layer's address for calculating real +address on the given address space. Support of ``address unit`` parameter is +up to each operations set implementation. ``paddr`` is the only operations set +implementation that supports the parameter. .. _damon_core_logic: -- 2.34.1