Matthew has looked at how I'm fumbling about trying to deal with Orangefs's need for much larger than page-sized IO... I think I need to implement orangefs_readahead and from there fire off an asynchronous read and while that's going I'll call readahead_page with a rac that I've cranked up with readahead_expand and when the read gets done I'll have plenty of pages for the large IO I did. Even if what I think I need to do is somewhere near right, the async code in the Orangefs kernel module didn't make it into the upstream version, so I have to refurbish that. All that to say: I don't need readahead_expand "tomorrow", but it fits into my plan to get Orangefs the extra pages it needs without me having open-coded page cache code in orangefs_readpage. -Mike On Wed, Feb 17, 2021 at 10:42 AM David Howells <dhowells@xxxxxxxxxx> wrote: > > Mike Marshall <hubcap@xxxxxxxxxxxx> wrote: > > > I plan to try and use readahead_expand in Orangefs... > > Would it help if I shuffled the readahead_expand patch to the bottom of the > pack? > > David >
