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The allocation request for swiotlb contiguous memory greater than 128*2KB cannot be fulfilled because it exceeds the maximum contiguous memory limit. If the swiotlb memory we allocate is larger than 128*2KB, swiotlb_find_slots() will still schedule the allocation of a new memory pool, which will increase memory overhead. Fix it by adding a check with alloc_size no more than 128*2KB before scheduling the allocation of a new memory pool in swiotlb_find_slots(). Signed-off-by: ZhangPeng <zhangpeng362@huawei.com> Reviewed-by: Petr Tesarik <petr.tesarik1@huawei-partners.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.