0431d926b3
The new checkpoint cache flush mechanism requires us to issue an unconditional cache flush before we start a new checkpoint. We don't want to block for this if we can help it, and we have a fair chunk of CPU work to do between starting the checkpoint and issuing the first journal IO. Hence it makes sense to amortise the latency cost of the cache flush by issuing it asynchronously and then waiting for it only when we need to issue the first IO in the transaction. To do this, we need async cache flush primitives to submit the cache flush bio and to wait on it. The block layer has no such primitives for filesystems, so roll our own for the moment. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Signed-off-by: Darrick J. Wong <djwong@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.