netdev - Re: [PATCH v2 1/3] mm/gup: add make_dirty arg to put_user_pages_dirty

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Message-ID: <5c303c80-57fd-d278-44d5-942597051c9b@nvidia.com>
Date:   Tue, 23 Jul 2019 18:31:40 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     <john.hubbard@...il.com>, Andrew Morton <akpm@...ux-foundation.org>
CC:     Alexander Viro <viro@...iv.linux.org.uk>,
        Björn Töpel <bjorn.topel@...el.com>,
        Boaz Harrosh <boaz@...xistor.com>,
        Christoph Hellwig <hch@....de>,
        Daniel Vetter <daniel@...ll.ch>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ilya Dryomov <idryomov@...il.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jérôme Glisse <jglisse@...hat.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Ming Lei <ming.lei@...hat.com>, Sage Weil <sage@...hat.com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Yan Zheng <zyan@...hat.com>, <netdev@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-mm@...ck.org>,
        <linux-rdma@...r.kernel.org>, <bpf@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH v2 1/3] mm/gup: add make_dirty arg to
 put_user_pages_dirty_lock()

On 7/23/19 6:26 PM, john.hubbard@...il.com wrote:
> From: John Hubbard <jhubbard@...dia.com>
...
> +		 * 2) This code sees the page as clean, so it calls
> +		 * set_page_dirty(). The page stays dirty, despite being
> +		 * written back, so it gets written back again in the
> +		 * next writeback cycle. This is harmless.
> +		 */
> +		if (!PageDirty(page))
> +			set_page_dirty_lock(page);
> +		break;

ahem, the above "break" should not be there, it's an artifact, sorry about 
that. Will correct on the next iteration.

thanks,
-- 
John Hubbard
NVIDIA


> +		put_user_page(page);
> +	}
>  }
>  EXPORT_SYMBOL(put_user_pages_dirty_lock);
>  
>