* Re: [uClinux-dev] uClinux 2.6.x memory allocator brokenness
[not found] <200308162245.16480.bernie@develer.com>
@ 2003-08-17 6:54 ` Christoph Hellwig
0 siblings, 0 replies; only message in thread
From: Christoph Hellwig @ 2003-08-17 6:54 UTC (permalink / raw)
To: Bernardo Innocenti; +Cc: linux-mm, uClinux development list
The right list for this would be linux-mm I guess..
On Sat, Aug 16, 2003 at 10:45:16PM +0200, Bernardo Innocenti wrote:
> Hello,
>
> not sure if anybody else experienced this problem. 2.5.x/2.6.x
> kernels seem to have some nasty bug in mm/page_alloc.c.
>
> When I allocate over 256KB of memory, the allocator steps into
> __alloc_pages() with order=7 and finds nothing free in the 512KB
> slab, then it splits the 1MB block in two 512MB blocks and fails
> miserably for some unknown reason.
>
> I also noticed that any allocation (even smaller ones) always
> fail in the fast path and falls down into the slowish code
> that wakes up kswapd to free some more pages.
>
> This happens because zone->pages_low is set to 512 while
> free_pages is consistently below 400 on my system.
>
> Perhaps these values would have to be retuned on embedded targets.
>
> --
> // Bernardo Innocenti - Develer S.r.l., R&D dept.
> \X/ http://www.develer.com/
>
> Please don't send Word attachments - http://www.gnu.org/philosophy/no-word-attachments.html
>
>
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