Hello Peter, > -----Original Message----- > From: Peter Zijlstra [mailto:pet...@infradead.org] > Sent: Wednesday, April 30, 2014 4:55 PM > To: Wang, Xiaoming > Cc: mi...@redhat.com; linux-kernel@vger.kernel.org; Liu, Chuansheng > Subject: Re: [PATCH] lib/spinlock_debug: Tweak the loop time to fit different > _delay() > > On Wed, Apr 30, 2014 at 06:40:38PM -0400, Wang, Xiaoming wrote: > > loops_per_jiffy*Hz is not always 1 second exactly > > it depends on the realization of _delay() . > > delay_tsc is used as _delay() in arch/x86/lib/delay.c > > This just states delay() is broken. The primary response should be to > try and fix that, no?
delay(1s_count) is accurate, but delay(1) is not accurate indeed, since executing some instruction, then the 1 cycle delay maybe be used already. -- 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/
