Dear Peter
If we wait the end of loop as loops_per_jiffy.
It may last more than 130s and local IRQ disabled at interval
which may cause Hard LOCKUP. We break out in 1 second and
dump the stack for debug.
> -----Original Message-----
> From: Peter Zijlstra [mailto:pet...@infradead.org]
> Sent: Wednesday, April 30, 2014 2:06 PM
> To: Wang, Xiaoming
> Cc: mi...@redhat.com; linux-kernel@vger.kernel.org; Liu, Chuansheng
> Subject: Re: [PATCH] lib/spinlock_debug: avoid one thread can not obtain
> the spinlock for a long time.
>
> On Wed, Apr 30, 2014 at 01:04:31PM -0400, Wang, Xiaoming wrote:
> > loops_per_jiffy is larger than expectation that possible causes one
> > thread can not obtain the spin lock for a long time.
> > So use cpu_clock() to reach timeout in one second which can avoid
> HARD
> > LOCKUP.
>
> This is just not making sense.. one thing is broken so then you tape on
> another? Fix the first already.
>
> Also, why do you care?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
