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Date: Fri, 13 Sep 2002 18:09:55 -0300 (BRT)
From: Rik van Riel <riel@conectiva.com.br>
X-X-Sender: riel@imladris.surriel.com
To: Pavel Machek <pavel@ucw.cz>
cc: kernel list <linux-kernel@vger.kernel.org>
Subject: Re: Good way to free as much memory as possible under 2.5.34?
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Message-ID: <Pine.LNX.4.44L.0209131808240.1857-100000@imladris.surriel.com>
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On Fri, 13 Sep 2002, Pavel Machek wrote:

> /*
>  * Try to free as much memory as possible, but do not OOM-kill anyone
>  *
>  * Notice: all userland should be stopped at this point, or livelock
> is possible.
>  */
>
> This worked before -rmap came in, but it does not free anything
> now. What needs to be done to fix it?

Actually, it still worked when -rmap came in, but it stopped working
when the LRU lists were made to be per-zone...

> static void free_some_memory(void)
> {
>         printk("Freeing memory: ");
>         while
> (try_to_free_pages(&contig_page_data.node_zones[ZONE_HIGHMEM], GFP_KSWAPD, 0))
>                 printk(".");
>         printk("|\n");
> }

Why don't you just allocate memory ?

To prevent the OOM kill you can just check for a variable
in the OOM slow path.  No need to rely on any particular
behaviour of the VM.

regards,

Rik
-- 
Bravely reimplemented by the knights who say "NIH".

http://www.surriel.com/		http://distro.conectiva.com/

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