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Under a high NFSv3 load with lots of different files being accessed, the LRU list of garbage-collectable files can become quite long. Asking list_lru_scan_node() to scan the whole list can result in a long period during which a spinlock is held, blocking the addition of new LRU items. So ask list_lru_scan_node() to scan only a few entries at a time, and repeat until the scan is complete. If the shrinker runs between two consecutive calls of list_lru_scan_node() it could invalidate the "remaining" counter which could lead to premature freeing. So add a spinlock to avoid that. Signed-off-by: NeilBrown <neilb@suse.de> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.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 reStructuredText 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.