3e10156997
While testing heavy delalloc workloads I noticed that sometimes we'd just stop preemptively flushing when we had loads of delalloc available to flush. This is because we skip preemptive flushing if delalloc <= ordered. However if we start with say 4gib of delalloc, and we flush 2gib of that, we'll stop flushing there, when we still have 2gib of delalloc to flush. Instead adjust the ordered bytes down by half, this way if 2/3 of our outstanding delalloc reservations are tied up by ordered extents we don't bother preemptive flushing, as we're getting close to the state where we need to wait on ordered extents. Signed-off-by: Josef Bacik <josef@toxicpanda.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 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.