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22fb0d99c9
Track number of read blocks in the whole filesystem. The counter is initialized when devices are opened. The counter is increased at btrfs_submit_dev_bio() if the stats tracking is enabled (depends on the read policy). Stats tracking is disabled by default and is enabled through fs_devices::collect_fs_stats when required. The code is not under the EXPERIMENTAL define, as stats can be expanded to include write counts and other performance counters, with the user interface independent of its internal use. This is an in-memory-only feature, not related to the dev error stats. Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.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.