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The slab depot maintains an additional small data structure, the "slab summary," which is used to reduce the amount of work needed to come back online after a crash. The slab summary maintains an entry for each slab indicating whether or not the slab has ever been used, whether it is clean (i.e. all of its reference count updates have been persisted to storage), and approximately how full it is. During recovery, each physical zone will attempt to recover at least one slab, stopping whenever it has recovered a slab which has some free blocks. Once each zone has some space (or has determined that none is available), the target can resume normal operation in a degraded mode. Read and write requests can be serviced, perhaps with degraded performance, while the remainder of the dirty slabs are recovered. Co-developed-by: J. corwin Coburn <corwin@hurlbutnet.net> Signed-off-by: J. corwin Coburn <corwin@hurlbutnet.net> Co-developed-by: Michael Sclafani <dm-devel@lists.linux.dev> Signed-off-by: Michael Sclafani <dm-devel@lists.linux.dev> Co-developed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: Matthew Sakai <msakai@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
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.