Mailing List Archive: Linux: Kernel

Re: [uml-devel] [PATCH 9/11] UML - Implement soft interrupts

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blaisorblade at yahoo

Jan 16, 2006, 4:24 PM

Post #1 of 3 (350 views)
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Re: [uml-devel] [PATCH 9/11] UML - Implement soft interrupts

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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jdike at addtoit

Jan 16, 2006, 7:32 PM

Post #2 of 3 (328 views)
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Re: [uml-devel] [PATCH 9/11] UML - Implement soft interrupts [In reply to]

On Tue, Jan 17, 2006 at 01:24:31AM +0100, Blaisorblade wrote:
> ~25 %? Good! Which is delay vs. host?

Delay vs a UML without the patch.

> 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.

It was separate from VCPU, but I never really looked at it since I already
had this. Some day I will to see if there are any trick in it that I should
use.

Jeff
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blaisorblade at yahoo

Jan 17, 2006, 6:17 AM

Post #3 of 3 (319 views)
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Re: [uml-devel] [PATCH 9/11] UML - Implement soft interrupts [In reply to]

On Tuesday 17 January 2006 04:32, Jeff Dike wrote:
> On Tue, Jan 17, 2006 at 01:24:31AM +0100, Blaisorblade wrote:
> > ~25 %? Good! Which is delay vs. host?
>
> Delay vs a UML without the patch.
>
> > 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.
>
> It was separate from VCPU,
conceptually, but I got only a blob comprising everything - never seen it
splitout (or maybe I split that out and forgot?)

> but I never really looked at it since I already
> had this. Some day I will to see if there are any trick in it that I
> should use.

--
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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