From: Rusty Russell <rusty@rustcorp.com.au>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Nick Piggin" <npiggin@kernel.dk>,
Stewart Smith <stewart@flamingspork.com>
Subject: Re: RFC: mincore: add a bit to indicate a page is dirty.
Date: Tue, 12 Feb 2013 16:19:29 +1030 [thread overview]
Message-ID: <87pq06f5ee.fsf@rustcorp.com.au> (raw)
In-Reply-To: <20130211162701.GB13218@cmpxchg.org>
Johannes Weiner <hannes@cmpxchg.org> writes:
> On Mon, Feb 11, 2013 at 01:43:03PM +1030, Rusty Russell wrote:
>> I am writing an app which really wants to know if a file is on the
>> disk or not (ie. do I need to sync?).
>
> When the page is under writeback, it's not necessarily on disk yet,
> but you also don't need to sync. Which semantics make more sense?
>
> I'm leaning toward checking both PG_dirty and PG_writeback.
If it's already under PG_writeback, you probably still need to wait for
it to finish if you're trying to ensure write ordering. ie. sync.
I've updated my patch by stealing your code.
Thanks!
Rusty.
prev parent reply other threads:[~2013-02-12 5:52 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-11 3:13 RFC: mincore: add a bit to indicate a page is dirty Rusty Russell
2013-02-11 16:27 ` Johannes Weiner
2013-02-11 22:12 ` Andrew Morton
2013-02-12 5:44 ` Rusty Russell
2013-02-15 6:34 ` [patch 1/2] mm: fincore() Johannes Weiner
2013-02-15 6:34 ` Johannes Weiner
2013-02-15 20:39 ` David Miller
2013-02-15 20:39 ` David Miller
2013-02-15 21:14 ` Andrew Morton
2013-02-15 21:14 ` Andrew Morton
2013-02-15 22:28 ` Johannes Weiner
2013-02-15 22:28 ` Johannes Weiner
2013-02-15 22:34 ` Andrew Morton
2013-02-15 22:34 ` Andrew Morton
2013-02-15 21:27 ` Andrew Morton
2013-02-15 21:27 ` Andrew Morton
2013-02-15 23:13 ` Johannes Weiner
2013-02-15 23:13 ` Johannes Weiner
2013-02-15 23:42 ` Andrew Morton
2013-02-15 23:42 ` Andrew Morton
2013-02-16 4:23 ` Rusty Russell
2013-02-16 4:23 ` Rusty Russell
2013-02-17 22:51 ` Johannes Weiner
2013-02-17 22:51 ` Johannes Weiner
2013-02-17 22:54 ` Andrew Morton
2013-02-17 22:54 ` Andrew Morton
2013-05-29 14:53 ` Andres Freund
2013-05-29 14:53 ` Andres Freund
2013-05-29 17:32 ` Johannes Weiner
2013-05-29 17:32 ` Johannes Weiner
2013-05-29 17:52 ` Andres Freund
2013-05-29 17:52 ` Andres Freund
2013-02-18 5:41 ` Rusty Russell
2013-02-18 5:41 ` Rusty Russell
2013-02-19 10:25 ` Simon Jeons
2013-02-19 10:25 ` Simon Jeons
2013-02-15 6:35 ` [patch 2/2] x86-64: hook up fincore() syscall Johannes Weiner
2013-02-15 6:35 ` Johannes Weiner
2013-02-12 5:49 ` Rusty Russell [this message]
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