From: George Anzinger <george@mvista.com>
To: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Cc: Lee Revell <rlrevell@joe-job.com>,
dipankar@in.ibm.com, ganzinger@mvista.com,
Manfred Spraul <manfred@colorfullife.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: RCU question
Date: Fri, 10 Dec 2004 19:29:18 -0800 [thread overview]
Message-ID: <41BA698E.8000603@mvista.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0412101943260.1101@montezuma.fsmlabs.com>
Zwane Mwaikambo wrote:
> On Fri, 10 Dec 2004, George Anzinger wrote:
>
>
>>>But that's a deadlock and if you enable interrupts you race.
>>
>>Again, I remind you we are in the idle task. Nothing more important to do.
>>Or do you mean that softirq_pending() will NEVER return false?
>>
>>The other question is: "Is useful work being done?"
>
>
> We're in the idle task but obviously interrupts (such as network) are
> still coming in. So you may take an interrupt after your while
> (softirq_pending()) loop has exited.
That is ok. Either we have interrupts off and no softirqs are pending and we
proceed to the "hlt" (where the interrupt will be taken), or softirqs are
pending, we turn interrupts on, do the softirq, turn interrupts off and try
again. Unless some tasklet (RCU?) never "gives up" or we will exit the while
with interrupts off and move on to the "hlt". Or did I miss something?
-
George Anzinger george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
next prev parent reply other threads:[~2004-12-11 3:29 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-09 23:59 RCU question George Anzinger
2004-12-10 4:31 ` Dipankar Sarma
2004-12-10 19:42 ` George Anzinger
2004-12-10 20:40 ` Dipankar Sarma
2004-12-10 20:45 ` Lee Revell
2004-12-10 21:02 ` George Anzinger
2004-12-10 22:58 ` Zwane Mwaikambo
2004-12-11 2:22 ` George Anzinger
2004-12-11 2:45 ` Zwane Mwaikambo
2004-12-11 3:29 ` George Anzinger [this message]
2004-12-11 14:52 ` Zwane Mwaikambo
2004-12-11 16:32 ` Manfred Spraul
2004-12-11 16:52 ` George Anzinger
2004-12-12 2:53 ` Zwane Mwaikambo
2004-12-12 8:59 ` Manfred Spraul
2004-12-12 9:37 ` Andrea Arcangeli
2004-12-12 10:22 ` Manfred Spraul
2004-12-12 12:15 ` Andrea Arcangeli
2004-12-14 21:40 ` Lee Revell
2004-12-14 22:23 ` [patch, 2.6.10-rc3] safe_hlt() & NMIs Ingo Molnar
2004-12-14 22:47 ` Ingo Molnar
2004-12-14 23:09 ` Linus Torvalds
2004-12-15 8:52 ` Ingo Molnar
2004-12-15 15:44 ` Linus Torvalds
2004-12-15 16:35 ` Ingo Molnar
2004-12-16 0:37 ` Alan Cox
2004-12-16 1:58 ` Linus Torvalds
2004-12-16 14:51 ` Ingo Molnar
2004-12-16 15:08 ` Maciej W. Rozycki
2004-12-16 15:11 ` Ingo Molnar
2004-12-16 15:42 ` Maciej W. Rozycki
2004-12-16 15:54 ` Linus Torvalds
2004-12-16 2:10 ` Zwane Mwaikambo
2004-12-16 13:26 ` Alan Cox
2004-12-14 23:41 ` Andrea Arcangeli
2004-12-14 23:00 ` Linus Torvalds
2004-12-15 5:04 ` Andi Kleen
2004-12-15 6:27 ` Avi Kivity
2004-12-15 8:51 ` Ingo Molnar
2004-12-12 16:51 ` RCU question George Anzinger
2004-12-12 22:40 ` Manfred Spraul
2004-12-13 5:22 ` George Anzinger
2004-12-12 16:26 ` Zwane Mwaikambo
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