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92501cb670
Add a userspace visible knob to tell the VM to keep an extra amount of memory free, by increasing the gap between each zone's min and low watermarks. This is useful for realtime applications that call system calls and have a bound on the number of allocations that happen in any short time period. In this application, extra_free_kbytes would be left at an amount equal to or larger than than the maximum number of allocations that happen in any burst. It may also be useful to reduce the memory use of virtual machines (temporarily?), in a way that does not cause memory fragmentation like ballooning does. [ccross] Revived for use on old kernels where no other solution exists. The tunable will be removed on kernels that do better at avoiding direct reclaim. [surenb] Will be reverted as soon as Android framework is reworked to use upstream-supported watermark_scale_factor instead of extra_free_kbytes. Bug: 86445363 Bug: 109664768 Bug: 120445732 Change-Id: I765a42be8e964bfd3e2886d1ca85a29d60c3bb3e Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Suren Baghdasaryan <surenb@google.com>
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.
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.