mirror of https://gitee.com/openkylin/linux.git
79f97c3051
The optional _PXM method evaluates to an integer that identifies the proximity domain of a device object. On ACPI based kernel boot, the field numa_node in 'struct device' is always set to -1 irrespective of _PXM value that is specified in the ACPI device object. But in case of device-tree based kernel boot the numa_node field is populated and reflects to a DT property that is specified in DTS according to the below document. https://www.kernel.org/doc/Documentation/devicetree/bindings/numa.txt http://lxr.free-electrons.com/source/drivers/of/device.c#L54 Without this patch dev_to_node() always returns -1 for all platform devices. This patch adds support for the ACPI _PXM method and updates the platform device NUMA node id using acpi_get_node() which provides the PXM-to-NUMA mapping information. The individual platform device drivers should be able to use the NUMA-aware memory allocation functions kmalloc_node() and alloc_pages_node() to improve performance. Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Jiandi An <anjiandi@codeaurora.org> [ rjw: Subject / changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.