From: Andrew Morton <akpm@linux-foundation.org>
To: Minchan Kim <minchan@kernel.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Dan Magenheimer <dan.magenheimer@oracle.com>,
Sonny Rao <sonnyrao@google.com>, Bryan Freed <bfreed@google.com>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 2/2] mm: forcely swapout when we are out of page cache
Date: Thu, 10 Jan 2013 13:58:28 -0800 [thread overview]
Message-ID: <20130110135828.c88bcaf1.akpm@linux-foundation.org> (raw)
In-Reply-To: <20130110022306.GB14685@blaptop>
On Thu, 10 Jan 2013 11:23:06 +0900
Minchan Kim <minchan@kernel.org> wrote:
> > I have a feeling that laptop mode has bitrotted and these patches are
> > kinda hacking around as-yet-not-understood failures...
>
> Absolutely, this patch is last guard for unexpectable behavior.
> As I mentioned in cover-letter, Luigi's problem could be solved either [1/2]
> or [2/2] but I wanted to add this as last resort in case of unexpected
> emergency. But you're right. It's not good to hide the problem like this path
> so let's drop [2/2].
>
> Also, I absolutely agree it has bitrotted so for correcting it, we need a
> volunteer who have to inverstigate power saveing experiment with long time.
> So [1/2] would be band-aid until that.
I'm inclined to hold off on 1/2 as well, really.
The point of laptop_mode isn't to save power btw - it is to minimise
the frequency with which the disk drive is spun up. By deferring and
then batching writeout operations, basically.
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next prev parent reply other threads:[~2013-01-10 21:58 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-09 6:21 [PATCH 0/2] Use up free swap space before reaching OOM kill Minchan Kim
2013-01-09 6:21 ` [PATCH 1/2] mm: prevent to add a page to swap if may_writepage is unset Minchan Kim
2013-01-09 6:56 ` Johannes Weiner
2013-01-09 7:10 ` Minchan Kim
2013-01-10 0:18 ` Andrew Morton
2013-01-10 2:03 ` Minchan Kim
2013-01-10 23:24 ` Luigi Semenzato
2013-01-10 23:27 ` Luigi Semenzato
2013-01-11 4:03 ` Minchan Kim
2013-01-10 0:20 ` Andrew Morton
2013-01-16 21:41 ` Andrew Morton
2013-01-17 0:53 ` Minchan Kim
2013-01-17 22:22 ` Andrew Morton
2013-01-17 23:36 ` Minchan Kim
2013-01-21 1:52 ` Minchan Kim
2013-01-21 14:39 ` Rik van Riel
2013-01-22 0:09 ` Minchan Kim
2013-02-05 1:43 ` Minchan Kim
2013-01-09 6:21 ` [PATCH 2/2] mm: forcely swapout when we are out of page cache Minchan Kim
2013-01-10 0:26 ` Andrew Morton
2013-01-10 2:23 ` Minchan Kim
2013-01-10 21:58 ` Andrew Morton [this message]
2013-01-11 4:43 ` Minchan Kim
2013-01-16 0:09 ` Andrew Morton
2013-01-16 0:32 ` Sonny Rao
2013-01-16 0:50 ` Andrew Morton
2013-01-16 1:21 ` Sonny Rao
2013-01-16 4:47 ` Minchan Kim
2013-01-16 20:08 ` Sonny Rao
2013-01-16 4:43 ` Minchan Kim
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