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add_node_ranges() takes 2.6s - 3.6s per 1T of boot time. On machine with 6T memory it takes 15.4s, on 32T it would take 82s-115s of boot time. This function sets NUMA ids for memory blocks, and scans the whole memory a page at a time to do so. But, we could use values in latency groups mask and match to determine the boundaries without checking every single page. With the fix the add_node_ranges() time is reduced from 15.4s down to 0.2s on machine with 6T memory. Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Reviewed-by: Babu Moger <babu.moger@oracle.com> Reviewed-by: Bob Picco <bob.picco@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.