Hi Luis,
On 30/10/12 05:38, Luis Alves wrote:
Thanks for the explanation Larry.
Meanwhile I've read some stuff about non-MMU memory alocation (I had
the wrong idea of how memory was allocated).
I guess my system ram is not that much (only 8Mb)...
What you are seeing though is a classic case of memory fragmentation.
You have eneough free RAM in total, but not enough in s ingle
contiguous block. On a paged MMU system this is not a problem, pages
can be mapped so you see a contiguous block the size you want. You
can't do that without no MMU and paging.
How would shared libs solve the problem?
The problem is allocating memory for 'ls' data and not 'ls' itself. Is
this correct?
I would dig into the busybox ls code. Wanting to allocate a block of
512k in a single chunk seems a bit crazy.
Regards
Greg
On Mon, Oct 29, 2012 at 5:49 PM, Larry Baker <ba...@usgs.gov> wrote:
Luis,
On 29 Oct 2012, at 8:32 AM, Luis Alves wrote:
DMA: 36*4kB 30*8kB 29*16kB 21*32kB 6*64kB 7*128kB 4*256kB 3*512kB
0*1024kB 0*2048kB 0*4096kB = 5360kB
The largest block of memory your system has available is 524288 (512*1024).
Allocation of length 528384 from process 94 (ls) failed
The requested size is larger than that, so uClinux tries to allocate the
next larger block size (1024K). There are none available.
Any sugestion?
I do not know what determines how much memory ls allocates.
I have similar memory allocation failures on my system. It does not appear
to use a shared uclibc. I do not know (yet) how to enable building a shared
uclibc or how to change the builds to use it. If the instructions are
straightforward, I would like to hear from someone.
Regards,
Luis
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Larry Baker
US Geological Survey
650-329-5608
ba...@usgs.gov
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