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Message-Id: <20130110135828.c88bcaf1.akpm@linux-foundation.org> Date: Thu, 10 Jan 2013 13:58:28 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Minchan Kim <minchan@...nel.org> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Dan Magenheimer <dan.magenheimer@...cle.com>, Sonny Rao <sonnyrao@...gle.com>, Bryan Freed <bfreed@...gle.com>, Hugh Dickins <hughd@...gle.com>, Rik van Riel <riel@...hat.com>, Johannes Weiner <hannes@...xchg.org> Subject: Re: [PATCH 2/2] mm: forcely swapout when we are out of page cache On Thu, 10 Jan 2013 11:23:06 +0900 Minchan Kim <minchan@...nel.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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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