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Subject: Re: Linux-Kernel Archive: No 100 HZ timer !
To: andre@linux-ide.org (Andre Hedrick)
Date: Fri, 13 Apr 2001 00:12:31 +0100 (BST)
Cc: schwidefsky@de.ibm.com, linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.4.10.10104121448520.4564-100000@master.linux-ide.org> from "Andre Hedrick" at Apr 12, 2001 02:52:22 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Okay but what will be used for a base for hardware that has critical
> timing issues due to the rules of the hardware?

> #define WAIT_MIN_SLEEP  (2*HZ/100)      /* 20msec - minimum sleep time */
> 
> Give me something for HZ or a rule for getting a known base so I can have
> your storage work and not corrupt.


The same values would be valid with add_timer and friends regardless. Its just
that people who do

	while(time_before(jiffies, started+DELAY))
	{
		if(poll_foo())
			break;
	}

would need to either use add_timer or we could implement get_jiffies()


	
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