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8f7f566f57
Originally, the btree key cache code would always allocate new entries by reusing from the recently-freed list, if that list wasn't empty. But that behaviour was dropped, for lock contention reasons. But it seems that entries stranded on the freed list have been contributing to some of our oom issues, because long running btree transactions will prevent them from being freed. This patch re-adds allocating from the freed list, but it also adds percpu buffers to solve the lock contention issues - and the new percpu freed lists will improve the evict paths, too. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.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.
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.