lkml.org 
[lkml]   [2011]   [Aug]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v6 2/2] Output stall data in debugfs
From
On Thu, Aug 11, 2011 at 2:17 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Thu, 2011-08-11 at 13:31 -0700, Alex Neronskiy wrote:
>>
>> > I mean, we're at the point where a PREEMPT=y kernel has a pretty decent
>> > latency and the PREEMPT_RT kernels live at ~30us. So wth are you
>> > measuring?
>> Well, not all kernels have PREEMPT. Chromebook kernels don't, for example.
>
> Can one infer from that statement that the purpose is trying to measure
> non preempt latency? Why not use the tracer build for that purpose?
>
> Still the watchdog ticks at 1s intervals or so, anything that takes that
> long, even on voluntary preemption kernels is quite insane.
I think Don grasped the sentiment well about a month ago when he
commented on the first version of the patch, so I'll just resend his
words:
On Wed, Jul 13, 2011 at 6:43 AM, Don Zickus <dzickus@redhat.com> wrote:
> I like the idea of this patch.  It definitely helps with better statistics
> when trying to set the appropriate values for a soft/hard lockup as
> opposed to pulling numbers from the air.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-08-12 00:05    [W:0.090 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site