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From: Blaisorblade <blaisorblade@yahoo.it>
To: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] [PATCH 9/11] UML - Implement soft interrupts
Date: Tue, 17 Jan 2006 01:24:31 +0100
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Cc: Jeff Dike <jdike@addtoit.com>, akpm@osdl.org, linux-kernel@vger.kernel.org
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On Sunday 15 January 2006 22:39, Jeff Dike wrote:
> This patch implements soft interrupts.  Interrupt enabling and
> disabling no longer map to sigprocmask.  Rather, a flag is set
> indicating whether interrupts may be handled.  If a signal comes in
> and interrupts are marked as OK, then it is handled normally.  If
> interrupts are marked as off, then the signal handler simply returns
> after noting that a signal needs handling.  When interrupts are enabled
> later on, this pending signals flag is checked, and the IRQ handlers
> are called at that point.

~25 %? Good! Which is delay vs. host?

A curiosity - did you look at the similar code in Ingo Molnar's VCPU patch? I 
never found the time to split it out and compare differencies. I just 
remember it using assembler inserts for (maybe atomic) bitmask manipulations.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade


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