linux-kernel - Re: [PATCH 4/6] mm: introduce page->dma_pinned_flags,

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Message-ID: <20181017110952.GN18839@dhcp22.suse.cz>
Date:   Wed, 17 Oct 2018 13:09:52 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Jan Kara <jack@...e.cz>, Dave Chinner <david@...morbit.com>,
        Matthew Wilcox <willy@...radead.org>,
        Christopher Lameter <cl@...ux.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 4/6] mm: introduce page->dma_pinned_flags, _count

On Tue 16-10-18 18:48:23, John Hubbard wrote:
[...]
> It's hard to say exactly what the active/inactive/unevictable list should
> be when DMA is done and put_user_page*() is called, because we don't know
> if some device read, wrote, or ignored any of those pages. Although if 
> put_user_pages_dirty() is called, that's an argument for "active", at least.

Any reason to not use putback_lru_page?

Please note I haven't really got through your patches to have a wider
picture of the change so this is just hint for the LRU part of the
issue.
-- 
Michal Hocko
SUSE Labs