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List:       opensolaris-mdb-discuss
Subject:    Re: [mdb-discuss] ::memstat shows kernel memory increase but
From:       Jonathan Adams <jonathan.adams () sun ! com>
Date:       2009-01-04 10:01:10
Message-ID: 20090104100110.GF255886 () eng ! sun ! com
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On Wed, Dec 24, 2008 at 10:25:09AM +0530, Pramod Gunjikar wrote:
> I have a test which basically results is a large number of DMA & kmem 
> resources to be allocated and freed up. After running
> the test, I observe that ::memstat shows that the kernel pages has 
> jumped from around 12% to around 50%. From the core files,
> ::findleaks does not report any leaks as a result of running the tests.
> 
> Is it that ::memstat just counts the physical pages which are marked 
> with KAS, and kmem_free & DMA free do not really result
> in physical pages taken out of KAS. Or is it possible that ::findleaks 
> has missed reporting some leaks.

The kmem subsystem only returns kernel storage when memory becomes "tight".
Until then, most frees will simply put the buffer on a freelist, for
quick allocation later.

Cheers,
- jonathan

> Appreciate your inputs and thoughts on the above.
> 
> Thanks
>    Pramod
> 
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> mdb-discuss mailing list
> mdb-discuss@opensolaris.org
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