Date: Wed, 11 Jul 2007 14:14:27 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Julian Elischer <julian@elischer.org> Cc: freebsd-hackers@freebsd.org Subject: Re: add closefrom() call Message-ID: <200707112114.l6BLERAF061933@apollo.backplane.com> References: <46930106.3040503@gmail.com> <20070710123634.GD1194@britannica.bec.de> <4693C77E.7070806@elischer.org>
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We added it basically because doing all the junk described in
previous postings in this thread in userland is a ridiculously huge
eyesore that doesn't scale and doesn't make sense when 5 minutes of
programming nets you a shiny new system call which does it all for you.
If you are worried about optimizing it (which kinda implies a system
call anyhow since you aren't doing a context switch for each descriptor),
worry about optimizing the kernel implementation of the system call
rather then optimizing the unoptimizable userland that eats 300ns+ per
descriptor to do the close() instead of the 10ns/descriptor that it
takes the kernel to do the close().
-Matt
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