linux-kernel - Re: [PATCH v1 00/15] Keep track of GUPed pages in fs and block

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Date:   Wed, 17 Apr 2019 17:19:43 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     Boaz Harrosh <boaz@...xistor.com>
Cc:     Boaz Harrosh <openosd@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-block@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>, Jan Kara <jack@...e.cz>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Ming Lei <ming.lei@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Matthew Wilcox <willy@...radead.org>,
        Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org,
        Yan Zheng <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Alex Elder <elder@...nel.org>, ceph-devel@...r.kernel.org,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Mike Marshall <hubcap@...ibond.com>,
        Martin Brandenburg <martin@...ibond.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        v9fs-developer@...ts.sourceforge.net, Coly Li <colyli@...e.de>,
        linux-bcache@...r.kernel.org,
        Ernesto A. Fernández 
        <ernesto.mnd.fernandez@...il.com>
Subject: Re: [PATCH v1 00/15] Keep track of GUPed pages in fs and block

On Tue, Apr 16, 2019 at 10:03:45PM -0400, Jerome Glisse wrote:
> On Wed, Apr 17, 2019 at 04:11:03AM +0300, Boaz Harrosh wrote:
> > On 17/04/19 02:16, Jerome Glisse wrote:
> > > On Wed, Apr 17, 2019 at 01:09:22AM +0300, Boaz Harrosh wrote:
> > >> On 16/04/19 22:57, Jerome Glisse wrote:

[...]

> > >>
> > >> BTW: Are you aware of the users of iov_iter_get_pages_alloc() Do they need fixing too?
> > > 
> > > Yeah and that patchset should address those already, i do not think
> > > i missed any.
> > > 
> > 
> > I could not find a patch for nfs/direct.c where a put_page is called
> > to balance the iov_iter_get_pages_alloc(). Which takes care of for example of
> > the blocklayout.c pages state
> > 
> > So I think the deep Audit needs to be for iov_iter_get_pages and get_user_pages
> > and the balancing of that. And the all of bio_alloc and bio_add_page should stay
> > agnostic to any pege-refs taking/putting
> 
> Will try to get started on that and see if i hit any roadblock. I will
> report once i get my feet wet, or at least before i drown ;)

So far it does not look too bad:

https://cgit.freedesktop.org/~glisse/linux/log/?h=gup-bio-v2

they are few things that will be harder to fit in like splice
and pipe that are populated from GUP.

Cheers,
Jérôme