lkml.org 
[lkml]   [2012]   [Dec]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V2] output the cpu number when printking.
On Tue, Dec 25, 2012 at 09:09:05AM +0800, Yanmin Zhang wrote:
> On Mon, 2012-12-24 at 09:55 -0800, Greg KH wrote:
> > On Mon, Dec 24, 2012 at 01:01:55PM +0800, he, bo wrote:
> > > From: "he, bo" <bo.he@intel.com>
> > >
> > > We often hit kernel panic issues on SMP machines because processes race
> > > on multiple cpu. By adding a new parameter printk.cpu, kernel prints
> > > cpu number at printk information line. It’s useful to debug what cpus
> > > are racing.
> >
> > How useful is this really for normal developers?
> It's very useful to debug race conditions under SMP environment.
> We applied the patch to our Android build image on our smartphones.

That's fine for your application, and seemed to be useful to others
with their first interactions with SMP systems. However, once you start
to get to "real" numbers of CPUs, this information turns pretty
pointless, which is why the patch was originally rejected.

sorry,

greg k-h
--
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: 2012-12-26 19:21    [W:0.093 / U:0.864 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site