Re: [PATCH] Prevent nested interrupts when the IRQ stack is near overflowing v2

[Andi Kleen]

On Thu, Mar 25, 2010 at 07:23:58PM +0100, Peter Zijlstra wrote:
> On Thu, 2010-03-25 at 19:21 +0100, Peter Zijlstra wrote:
> > On Thu, 2010-03-25 at 11:01 -0700, Linus Torvalds wrote:
> > > Are there any cases around 
> > > that still have busy-loop delays based on real-time in their irq handlers? 
> > > I simply don't know. 
> > 
> > I recently found a few in drivers/net/ there's all kinds of funny stuff
> > in there.. not sure how common the matching hardware is though.
> > 
> > One thing we could do is instrument jiffies to yell when its used from
> > hardirq context and fix up these things.
> 
> Also, Arjan mentioned he wanted to sweep the kernel for jiffies users
> and convert them to timer interfaces..

% linux-2.6> gid jiffies | wc -l
7569

Good luck.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/