Re: [PATCH] updated low-latency zap_page_range

From: george anzinger (george@mvista.com)
Date: Wed Jul 24 2002 - 20:39:18 EST

Next message: Bartlomiej Zolnierkiewicz: "Re: Linux-2.5.28"
Previous message: Neil Brown: "Re: PATCH - mark 2: type safe(r) list_entry repacement: con"
In reply to: Linus Torvalds: "Re: [PATCH] updated low-latency zap_page_range"
Next in thread: Linus Torvalds: "Re: [PATCH] updated low-latency zap_page_range"
Reply: Linus Torvalds: "Re: [PATCH] updated low-latency zap_page_range"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Linus Torvalds wrote:
>
> On 24 Jul 2002, Robert Love wrote:
> >
> > if (preempt_count() == 1 && need_resched())
> >
> > Then we get "if (0 && ..)" which should hopefully be evaluated away.
>
> I think preempt_count() is not unconditionally 0 for non-preemptible
> kernels, so I don't think this is a compile-time constant.
>
> That may be a bug in preempt_count(), of course.
>
Didn't we just put bh_count and irq_count in the same
word???

-- 
George Anzinger   george@mvista.com
High-res-timers: 
http://sourceforge.net/projects/high-res-timers/
Real time sched:  http://sourceforge.net/projects/rtsched/
Preemption patch:
http://www.kernel.org/pub/linux/kernel/people/rml
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Next message: Bartlomiej Zolnierkiewicz: "Re: Linux-2.5.28"
Previous message: Neil Brown: "Re: PATCH - mark 2: type safe(r) list_entry repacement: con"
In reply to: Linus Torvalds: "Re: [PATCH] updated low-latency zap_page_range"
Next in thread: Linus Torvalds: "Re: [PATCH] updated low-latency zap_page_range"
Reply: Linus Torvalds: "Re: [PATCH] updated low-latency zap_page_range"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Tue Jul 30 2002 - 14:00:18 EST