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Currently, alloc_contig_range expects that even though a page fails with -EBUSY from __alloc_contig_migrate_range, it want to check those failed pages in test_pages_isolated again with hope that those page would be freed soon so cma allocatoin would be succeeded. However, it depends on the luck and I found sometimes test_page_isolated constantly fails at the page repeatedly whenever cma_alloc retried. Rather than burning out CPU to check the page's status in test_pages_isolated for GFP_NORETRY allocation, just bail out and relies on the user what they want to do. Currently, this option works for only __GFP_NORETRY case for safe of existing other users. Bug: 192475091 Signed-off-by: Minchan Kim <minchan@google.com> Change-Id: I9211452be06960dc7d8f854537e53b3fc5262c8e Signed-off-by: azrim <mirzaspc@gmail.com>
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.