linux-kernel - Re: [PATCH 03/33] mm: Implement readahead

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Message-ID: <1900214.1613600436@warthog.procyon.org.uk>
Date:   Wed, 17 Feb 2021 22:20:36 +0000
From:   David Howells <dhowells@...hat.com>
To:     Mike Marshall <hubcap@...ibond.com>
Cc:     dhowells@...hat.com, Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@....de>,
        Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-mm <linux-mm@...ck.org>, linux-cachefs@...hat.com,
        linux-afs@...ts.infradead.org,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        linux-cifs@...r.kernel.org,
        ceph-devel <ceph-devel@...r.kernel.org>,
        V9FS Developers <v9fs-developer@...ts.sourceforge.net>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Jeff Layton <jlayton@...hat.com>,
        David Wysochanski <dwysocha@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/33] mm: Implement readahead_control pageset expansion

Mike Marshall <hubcap@...ibond.com> wrote:

> 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.

Would the netfs helper lib in patches 5-13 here be of use to orangefs?  Most
of the information about it is on patch 8.

David