lkml.org 
[lkml]   [2014]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [RFC PATCH v5 09/10] thermal: add trace events to the power allocator governor
On Thu, Jul 10, 2014 at 07:03:50PM +0100, Steven Rostedt wrote:
> On Thu, 10 Jul 2014 17:20:14 +0100
> "Javi Merino" <javi.merino@arm.com> wrote:
>
>
> > >
> > > How many CPUs are you saving load_cpu on? A trace event can't be bigger
> > > than a page. And the data is actually a little less than that with the
> > > required headers.
> >
> > The biggest system I've tested it on is an 8 cpu system (with
> > NR_CPUS==8). So yes, small and we haven't seen any issues.
> >
> > Are you saying that we are siphoning too much data through ftrace? He
> > find it really valuable to collect information during run and process
> > it afterwards but I can see how this may not be feasible for systems
> > with thousands of cpus.
>
> Only too much for a single event. Perhaps have the tracepoint post per
> CPU? Then you wouldn't need that array.

Sounds good, I'll do that.



\
 
 \ /
  Last update: 2014-07-11 11:21    [W:0.055 / U:0.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site