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Re: speedup device flushing with devfs

From: Andrew Clausen
Subject: Re: speedup device flushing with devfs
Date: Sun, 15 Dec 2002 10:06:53 +1100
User-agent: Mutt/1.4i

On Sat, Dec 14, 2002 at 12:07:59PM +0100, David Schweikert wrote:
> I noticed that a simple
> # parted -s /dev/ide/host0/bus0/target0/lun0/disc print
> takes on my machine 1.5 seconds to complete.
> I made a strace and I did see that parted does try to open
> part1, part2, ... part15, in that directory, which in turn triggers
> devfs module probing.

Hmmm.  What kind of module probing?  Rescanning the partition table?
(I don't have devfs here...)

> With the following simple patch, the time required is down to 0.05
> seconds. Is this a good thing or am I going to destroy my disks?

Why not structure the loop around scanning the directory, rather than
around iterating through partition numbers?


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