linux-kernel - Re: Question about Reiser4

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Message-ID: <462D4FE1.5040406@zytor.com>
Date:	Mon, 23 Apr 2007 17:31:29 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Theodore Tso <tytso@....edu>, "H. Peter Anvin" <hpa@...or.com>,
	Eric Hopper <hopper@...ifarious.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Question about Reiser4

Theodore Tso wrote:
>>>
>> Now, to be fair, there are probably a number of cases where 
>> open/lseek/readv/close and open/lseek/writev/close would be worth doing 
>> as a single system call.  The big problem as far as I can see involves 
>> EINTR handling; such a system call has serious restartability implications.
> 
> Sure, but Hans wants to change /etc/inetd.conf into /etc/inetd.conf.d,
> where you have: /etc/inetd.conf.d/telnet/port,
> /etc/inetd.conf.d/telnet/protocol, /etc/inetd.conf.d/telnet/wait,
> /etc/inetd.conf.d/telnet/userid, /etc/inetd.conf.d/telnet/daemon,
> etc. for each individual line in /etc/inetd.conf.  (And where each
> file might only contains 2-4 characters each: i.e., "23", "tcp",
> "root", etc.)
> 
> So it's not enough just to collapse open/pread/close into a single
> system call; in order to gain back the performance squandered by all
> of these itsy-bitsy tiny little files.  You want to collapse the
> open/pread/close for many of these little files into a single system
> call, hence Hans's insistence on sys_reiser4(); otherwise his scheme
> doesn't work all that well at all.
> 

Heh.  sys_read_tree() -- walk a directory tree and return it as a data 
structure in memory :)

	-hpa
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