mm/readahead.c/read_pages was quite a bit different back
when I put my open-coded readahead logic into orangefs_readpage.
It seemed to work as designed then, it is a trainwreck now.
This patch implements orangefs_readahead using new xarray
and readahead_expand features that have just been pulled and
removes all my open-coded readahead logic.
This patch 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. One
of the regressions has gone away with the most recent version of
their code that I'm using. I hope this patch can be
pulled even though there are still a few regressions, and that
we can try to get them resolved during the RC period.
-----BEGIN PGP SIGNATURE-----
iQIzBAABCAAdFiEEIGSFVdO6eop9nER2z0QOqevODb4FAmCPCUsACgkQz0QOqevO
Db77DQ/7B8V7RPlQ8C6HJlSuCED67W9isCG5CdzGobVafBrirbUusanQJRhjrIZO
Voy0NYsR/rsM3K1tNk9AE7rlbT4UQibeUXwFVcVjBvtyXBiTgjbROc2AP4pjxAWu
erH2McMEbrYjgrevwR/PKxyD8wS6vTX2InnI4yvlkbfEz04u/KkTSu0oN4UCU/8u
8/drWDTIgZz6wffb1RpMFsCP77tfVWIWlRlH39u9OTe4fhPMug8jN+uOBrfyYxdp
snJWznyeSYCQ4q/KkPkjfSUTDmx3+E1WeSHMNviHfwENdbcUAojk2O9wepBwJhQn
r0DFU2yM+132oRkWO1DF7If1FRfvcmHjE4bmlLBSg+xgKOKpdMCs7Nf+s1Sji+w/
8xTAPWzdqBeW6z4nIncvZPtjtes3979mJ/Jm/f4GLonAQB6yPJcIzA8gl5EEgXI3
20pAt2JNCgCHVhHQso5fkLINlpND/cwlbOEOjyrNXIoJJngGDRo9FQ/osGBaLv5i
n3XWC41lYnX9nqJ2FuVLBuZ+Jv1k5XSQualpyGGVTFaYp/jZVbjUOgJk7QPNsWl7
9cUZAMVdDW6y7z1aZ2bu5y7VFIkPe4nfZNqrgXX+YySq0uOTrQBegkQRp1pu3t8m
P3P9lVqcrn/kw+FASZborq921Njw+YDHvZuYfrnbF7J0sUL0fu4=
=09Vm
-----END PGP SIGNATURE-----
Merge tag 'for-linus-5.13-ofs-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
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.
9ccce092fc