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SubjectRe: [patch 2/3] Enable setting of IRQ-thread priorities from kernel cmdline (repost:CC to LKML)
On Wed, 19 Dec 2007 20:45:53 +0100 Remy Bohmer wrote:

> Documentation/kernel-parameters.txt | 7 ++
> include/linux/irq.h | 1
> kernel/irq/manage.c | 101 ++++++++++++++++++++++++++++++++----
> 3 files changed, 98 insertions(+), 11 deletions(-)
>
> Index: linux-2.6.24-rc5-rt1/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.24-rc5-rt1.orig/Documentation/kernel-parameters.txt 2007-12-18 22:09:13.000000000 +0100
> +++ linux-2.6.24-rc5-rt1/Documentation/kernel-parameters.txt 2007-12-18 22:09:16.000000000 +0100
> @@ -799,6 +799,13 @@ and is between 256 and 4096 characters.
> ips= [HW,SCSI] Adaptec / IBM ServeRAID controller
> See header of drivers/scsi/ips.c.
>
> + irq_pmap= [IRQ-threading] List of priorities each interrupt
> + thread must have.
> + Format: irq_pmap=megasas:90,eth0:40,50
> + The first field without ':', is the default prio.

Drop comma.

> + If this cmdline argument is ommitted, every thread

omitted,

> + runs at prio 50.
> +
> ports= [IP_VS_FTP] IPVS ftp helper module
> Default is 21.
> Up to 8 (IP_VS_APP_MAX_PORTS) ports

> Index: linux-2.6.24-rc5-rt1/kernel/irq/manage.c
> ===================================================================
> --- linux-2.6.24-rc5-rt1.orig/kernel/irq/manage.c 2007-12-18 22:09:13.000000000 +0100
> +++ linux-2.6.24-rc5-rt1/kernel/irq/manage.c 2007-12-18 22:15:43.000000000 +0100

> @@ -901,3 +918,65 @@ void __init early_init_hardirqs(void)
> for (i = 0; i < NR_IRQS; i++)
> init_waitqueue_head(&irq_desc[i].wait_for_handler);
> }
> +
> +#ifdef CONFIG_PREEMPT_HARDIRQS
> +
> +/*
> + * Lookup the interrupt thread priority
> + * A map for the priorities can be given on the kernel commandline.
> + * if name is NULL, or no kernel commandline options is given, the default

If ...................................... option is given,

> + * prio is used, which is either MAX_PRIO/2, or the default given on the
> + * kernel commandline.
> + */
> +static int get_irq_prio(const char *name)
> +{


---
~Randy


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