9ccce092fc
Pull orangefs updates from Mike Marshall:
"orangefs: implement orangefs_readahead
mm/readahead.c/read_pages was quite a bit different back when I put my
open-coded readahead logic into orangefs_readpage. That logic seemed
to work as designed back then, it is a trainwreck now.
This implements orangefs_readahead using the new xarray and
readahead_expand features and removes all my open-coded readahead
logic.
This results in an extreme read performance improvement, these sample
numbers are from my test VM:
Here's an example of what's upstream in
5.11.8-200.fc33.x86_64:
30+0 records in
30+0 records out
125829120 bytes (126 MB, 120 MiB) copied, 5.77943 s, 21.8 MB/s
And here's this version of orangefs_readahead on top of 5.12.0-rc4:
30+0 records in
30+0 records out
125829120 bytes (126 MB, 120 MiB) copied, 0.325919 s, 386 MB/s
There are four xfstest regressions with this patch. David Howells and
Matthew Wilcox have been helping me work with this code"
* tag 'for-linus-5.13-ofs-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux:
orangefs: leave files in the page cache for a few micro seconds at least
Orangef: implement orangefs_readahead.
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
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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.