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2abe542087
Originally, bcachefs - going back to bcache - stored, for each bucket, a 16 bit counter corresponding to how long it had been since the bucket was read from. But, this required periodically rescaling counters on every bucket to avoid wraparound. That wasn't an issue in bcache, where we'd perodically rewrite the per bucket metadata all at once, but in bcachefs we're trying to avoid having to walk every single bucket. This patch switches to persisting 64 bit io clocks, corresponding to the 64 bit bucket timestaps introduced in the previous patch with KEY_TYPE_alloc_v2. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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.