Date: Wed, 14 Dec 2005 10:11:28 +0100 From: "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de> To: freebsd-stable@freebsd.org Subject: how to reach a developer Message-ID: <439FE1C0.3050807@gmx.de>
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Because of the devfs discussion I had a look into
sys/fs/devfs/devfs_rules.c .
Somewhere in the sourcecode he/she's asking a question and I would like
to answer it. There just is no email address provided.
The question is as follows:
/*
* XXX: Does it matter whether we do
*
* foreach(dk in ds)
* foreach(de in dm)
* apply(dk to de)
*
* as opposed to
*
* foreach(de in dm)
* foreach(dk in ds)
* apply(dk to de)
*
* The end result is obviously the same, but does the order
* matter?
*/
Supposing that there is only read access to dk and only de is
manipulated by the operation apply(dk to de); I have to say that the
second example is a lot more efficient, because the first one causes
lots of unnecessary cache to memory writebacks. Which would be gracefuly
avoided by the second one.
- Dominic
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