Re: [uClinux-dev] uClinux 2.6.x memory allocator brokenness

Re: [uClinux-dev] uClinux 2.6.x memory allocator brokenness

[Christoph Hellwig]

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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