Subject: Re: kernel map entry merging and PR 24039
To: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
From: Bill Studenmund <wrstuden@netbsd.org>
List: tech-kern
Date: 02/05/2004 11:15:38
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On Thu, Feb 05, 2004 at 04:52:51PM +0900, YAMAMOTO Takashi wrote:
> > >honestly, i'm not sure why people hate to disable merging so much.
> > >merging don't solve kva or memory fragmentation.
> > >it only solve map entry fragmentation, which can be solved by
> > >vmem-like chunking. am i missing some points?
> >=20
> > Because it's just wasteful and slow things down. 18K+ map entries
> > *must* have a performance hit.
>=20
> do you mean, things like vmem won't work?
Do we have code for vmem? We have code for merging, which only needs (what
seem) minor fixes. Seems like today the easiest thing to do is fix=20
merging.
Take care,
Bill
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