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| Filename | Latest commit message | Latest commit date |
|---|---|---|
8ffd0015dd
Port support from 3.10 for retrying cma allocations to 3.18 to help resolve cma allocation failures. It was observed that CMA pages are sometimes getting pinned down by BG processes scheduled out in their exit path. Since BG processes have lower priority they end up getting less time slice by scheduler there by consuming more time to free up CMA pages. Also when a process is being forked copy_one_pte may create copy-on-write mappings, when this is done the page _count and page _mapcount are each incremented sequentially. If the process is context switched out after incrementing the _count but before incrementing the _mapcount then the page will appear temporarily pinned. So instead of failing to allocate and directly returning an error on the CMA allocation path we do 2 retries, with sleeps, to give the system an opportunity to unpin any pinned pages. Change-Id: I022a9341f8ee44f281c7cb34769695843e97d684 Signed-off-by: Susheel Khiani <skhiani@codeaurora.org> Signed-off-by: Liam Mark <lmark@codeaurora.org> Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org> Signed-off-by: Charan Teja Reddy <charante@codeaurora.org> [isaacm@codeaurora.org: resolve merge conflicts] Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org> |
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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.