lkml.org 
[lkml]   [2010]   [Dec]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Patch 00/15] Reduce tracing payload size.
On Mon, Dec 06, 2010 at 08:56:37AM -0500, Ted Ts'o wrote:
> On Mon, Dec 06, 2010 at 02:22:00PM +0100, Andi Kleen wrote:
> > David Sharp <dhsharp@google.com> writes:
> > >
> > > These patches are just a start to shrinking the size of trace events. I am
> > > planning to also make small versions of trace events that are used when
> > > CONFIG_SMALL_TRACES is enabled. I'm also open to discussion of other ways to
> > > shrink event sizes.
> >
> > Maybe the simplest would be to lzo them as they get logged?
> > I assume you already considered that?
>
> The tracing subsystem is supposed to be extremely low-overhead.
> Compressiong the event log would add considerable CPU overhead. If we

lzo as a rule of thumb is about as expensive as 3x memcpy()
That's not really expensive.

-Andi

--
ak@linux.intel.com -- Speaking for myself only.


\
 
 \ /
  Last update: 2010-12-06 16:01    [W:0.066 / U:10.200 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site