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| Filename | Latest commit message | Latest commit date |
|---|---|---|
bae18180aa
[ Upstream commit 8a105678fb3ec4763352db84745968bf2cb4aa65 ]
Granting pages consumes backend system memory. In systems configured
with insufficient spare memory for those pages, it can cause a memory
pressure situation. However, finding the optimal amount of the spare
memory is challenging for large systems having dynamic resource
utilization patterns. Also, such a static configuration might lack
flexibility.
To mitigate such problems, this commit adds a memory reclaim callback to
'xenbus_driver'. If a memory pressure is detected, 'xenbus' requests
every backend driver to volunarily release its memory.
Note that it would be able to improve the callback facility for more
sophisticated handlings of general pressures. For example, it would be
possible to monitor the memory consumption of each device and issue the
release requests to only devices which causing the pressure. Also, the
callback could be extended to handle not only memory, but general
resources. Nevertheless, this version of the implementation defers such
sophisticated goals as a future work.
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: SeongJae Park <sjpark@amazon.de>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Stable-dep-of: afc545da381b ("xen: Fix the issue of resource not being properly released in xenbus_dev_probe()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
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| README | ||
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.