linux-kernel - Re: Kernel code interrupted by Timer

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Message-ID: <1360396316.582.128.camel@anish-Inspiron-N5050>
Date:	Sat, 09 Feb 2013 13:21:56 +0530
From:	anish kumar <anish198519851985@...il.com>
To:	Peter Teoh <htmldeveloper@...il.com>
Cc:	Gaurav Jain <gjainroorkee@...il.com>,
	Kernel Newbies <kernelnewbies@...nelnewbies.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Kernel code interrupted by Timer

On Sat, 2013-02-09 at 14:57 +0800, Peter Teoh wrote:
> 
> 
> On Sat, Feb 9, 2013 at 1:47 PM, anish kumar 
> .
>         Timer interrupts is supposed to cause scheduling and scheduler
>         may or
>         may not pick up your last process(we always use the term
>         "task" in
>         kernel space) after handling timer interrupt.
>         >
>         
> 
> 
> Sorry if I may disagree, correct me if wrong.   Timer interrupt and
> scheduler is two different thing.   I just counted in the "drivers"
> subdirectory, there are at least more than 200 places where
> "setup_timer()" is called, and these have nothing to do with
> scheduling.   For eg, heartbeat operation etc.  Not sure I
> misunderstood something?
Have a look at kernel/timer.c and kernel/hrtimer.c.
There are many sched() calls in these files.This will invoke scheduler.
> 
> 
> -- 
> Regards,
> Peter Teoh


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