From: Michal Hocko <mhocko@kernel.org>
To: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Baoquan He <bhe@redhat.com>, Vlastimil Babka <vbabka@suse.cz>,
Andrea Arcangeli <aarcange@redhat.com>,
David Hildenbrand <david@redhat.com>,
Mel Gorman <mgorman@techsingularity.net>,
David Herrmann <dh.herrmann@gmail.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Kan Liang <kan.liang@intel.com>, Andi Kleen <ak@linux.intel.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Peter Zijlstra <peterz@infradead.org>,
Christoph Lameter <cl@linux.com>, Nick Piggin <npiggin@gmail.com>,
pifang@redhat.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCHi v2] mm: put_and_wait_on_page_locked() while page is migrated
Date: Mon, 26 Nov 2018 20:53:45 +0100 [thread overview]
Message-ID: <20181126195345.GI12455@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.LSU.2.11.1811261121330.1116@eggly.anvils>
On Mon 26-11-18 11:27:07, Hugh Dickins wrote:
[...]
> @@ -1049,25 +1056,44 @@ static void wake_up_page(struct page *page, int bit)
> wake_up_page_bit(page, bit);
> }
>
> +/*
> + * A choice of three behaviors for wait_on_page_bit_common():
> + */
> +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.
> + */
> +};
I like this. It makes to semantic much more clear.
Thanks!
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-11-26 19:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-25 3:21 [PATCH] mm: put_and_wait_on_page_locked() while page is migrated Hugh Dickins
2018-11-25 4:07 ` Andrea Arcangeli
2018-11-25 18:30 ` Linus Torvalds
2018-11-26 3:29 ` Hugh Dickins
2018-11-26 19:27 ` Tim Chen
2018-11-26 19:27 ` [PATCHi v2] " Hugh Dickins
2018-11-26 19:30 ` Linus Torvalds
2018-11-26 19:53 ` Michal Hocko [this message]
2018-11-26 20:53 ` Matthew Wilcox
2018-11-27 10:56 ` Mike Rapoport
2018-11-27 16:49 ` Christopher Lameter
2018-11-27 16:56 ` Michal Hocko
2018-11-27 16:58 ` Linus Torvalds
2018-11-27 8:21 ` Vlastimil Babka
2018-11-27 10:58 ` Mike Rapoport
2018-11-27 18:10 ` Matthew Wilcox
2018-11-27 21:08 ` Hugh Dickins
2018-11-27 21:45 ` Mike Rapoport
2018-11-27 22:40 ` Joey Pabalinas
2019-01-10 9:26 ` Vlastimil Babka
2019-01-11 2:08 ` Hugh Dickins
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