From: David Brownell <david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
To: "Joakim Tjernlund"
<Joakim.Tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: Performance of spi_mpc83xx.c sucks.
Date: Tue, 2 Dec 2008 11:10:52 -0800 [thread overview]
Message-ID: <200812021110.52964.david-b@pacbell.net> (raw)
In-Reply-To: <040601c954ab$554cff20$ffe6fd60$@Tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
On Tuesday 02 December 2008, Joakim Tjernlund wrote:
> Oh, so the kernel thread actually gets pre-empted(is that a word?)
> once it has consumed its "time slice"?
And potentially at other times. When an IRQ arrives and
is handled, that's a form of non-task preemption. And
when that IRQ enables a higher-priority task, the lower
priority one can be preempted in a more usual manner.
> Do I need to turn on
> pre-empt support in the kernel for this?
To get some kinds of preemption, yes. But it's not
strictly required.
- Dave
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prev parent reply other threads:[~2008-12-02 19:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-21 16:19 Performance of spi_mpc83xx.c sucks Joakim Tjernlund
[not found] ` <1224605947.14078.17.camel-/EMGr9iCeazgSi9v3i4K4Pmbkio/vSLMs0AfqQuZ5sE@public.gmane.org>
2008-10-21 18:14 ` Peter Korsgaard
[not found] ` <877i81rf2g.fsf-uXGAPMMVk8amE9MCos8gUmSdvHPH+/yF@public.gmane.org>
2008-10-21 18:31 ` Joakim Tjernlund
[not found] ` <002f01c933ab$4bee9180$e3cbb480$@Tjernlund@transmode.se>
[not found] ` <002f01c933ab$4bee9180$e3cbb480$@Tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
2008-11-21 4:10 ` David Brownell
[not found] ` <200811202010.30845.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2008-12-02 15:20 ` Joakim Tjernlund
[not found] ` <1228231118.9867.108.camel-/EMGr9iCeazgSi9v3i4K4Pmbkio/vSLMs0AfqQuZ5sE@public.gmane.org>
2008-12-02 16:23 ` Peter Korsgaard
[not found] ` <87d4gav94h.fsf-uXGAPMMVk8amE9MCos8gUmSdvHPH+/yF@public.gmane.org>
2008-12-02 18:20 ` Joakim Tjernlund
[not found] ` <040001c954aa$a00e3930$e02aab90$@Tjernlund@transmode.se>
[not found] ` <040001c954aa$a00e3930$e02aab90$@Tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
2008-12-02 18:31 ` David Brownell
[not found] ` <200812021031.26711.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2008-12-02 18:58 ` Joakim Tjernlund
[not found] ` <041201c954af$f32ad3d0$d9807b70$@Tjernlund@transmode.se>
[not found] ` <041201c954af$f32ad3d0$d9807b70$@Tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
2008-12-02 20:46 ` David Brownell
[not found] ` <200812021246.27884.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2008-12-02 22:12 ` Joakim Tjernlund
[not found] ` <041e01c954cb$15c0f030$4142d090$@Tjernlund@transmode.se>
[not found] ` <041e01c954cb$15c0f030$4142d090$@Tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
2008-12-03 8:56 ` David Brownell
2008-12-02 18:17 ` David Brownell
[not found] ` <200812021017.11880.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2008-12-02 18:25 ` Joakim Tjernlund
[not found] ` <040601c954ab$554cff20$ffe6fd60$@Tjernlund@transmode.se>
[not found] ` <040601c954ab$554cff20$ffe6fd60$@Tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
2008-12-02 19:10 ` David Brownell [this message]
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