linux-kernel - Re: [PATCHi v2] mm: put_and_wait_on_page

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Message-ID: <CAHk-=wix+0_ED+78Q43Sk+hoObO+Q1DoSOqq_TLnH2=wcNHx2A@mail.gmail.com>
Date:   Mon, 26 Nov 2018 11:30:07 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, bhe@...hat.com,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>, david@...hat.com,
        mgorman@...hsingularity.net,
        David Herrmann <dh.herrmann@...il.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>, kan.liang@...el.com,
        Andi Kleen <ak@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Christoph Lameter <cl@...ux.com>,
        Nick Piggin <npiggin@...il.com>, pifang@...hat.com,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org
Subject: Re: [PATCHi v2] mm: put_and_wait_on_page_locked() while page is migrated

On Mon, Nov 26, 2018 at 11:27 AM Hugh Dickins <hughd@...gle.com> wrote:
>
> +enum behavior {
> +       EXCLUSIVE,      /* Hold ref to page and take the bit when woken, like
> +                        * __lock_page() waiting on then setting PG_locked.
> +                        */
> +       SHARED,         /* Hold ref to page and check the bit when woken, like
> +                        * wait_on_page_writeback() waiting on PG_writeback.
> +                        */
> +       DROP,           /* Drop ref to page before wait, no check when woken,
> +                        * like put_and_wait_on_page_locked() on PG_locked.
> +                        */
> +};

Ack, thanks.

                Linus