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Re: fixed memory pools
- From: Andrew Lunn <andrew dot lunn at ascom dot ch>
- To: Tom Coremans <tom dot coremans at acunia dot com>
- Cc: eCos Disuss <ecos-discuss at sources dot redhat dot com>
- Date: Mon, 18 Feb 2002 10:15:37 +0100
- Subject: Re: [ECOS] fixed memory pools
- References: <3C70C498.BD758EE2@acunia.com>
On Mon, Feb 18, 2002 at 10:08:40AM +0100, Tom Coremans wrote:
> suppose I have created a fixed memory pool of 1000 bytes with a block
> size of 100 bytes. Is it then possible to obtain 10 blocks of 100 bytes
> from the pool without freeing any of them or will that not work. Are
> there maybe some blocks that are used for admin information??
Yes, some blocks are used for admin. It keeps a bitmap of blocks
free/in use. For this example, expect to get 9 usable blocks. This
caught me out the first time i used fixed is memory pools. After some
discussion with RedHat i think they added a comment to the
documentation to say there is some overhead. It actually says:
"The memory available from the memory pools will not be the same size
as the memory supplied to it. Some of the memory is used for internal
data structures of the allocator."
Andrew
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