Re: [PATCH 0/4] workqueue_trace: Add max execution time mesurement for per worklet

[Frederic Weisbecker <fweisbec@gmail.com>]

On Wed, Apr 29, 2009 at 12:06:16AM -0700, Andrew Morton wrote:
> What is the meaning of M_EXECus?  Mean execution time in microseconds,
> I assume?  I wonder if that is sufficiently high resolution nowadays.


It's the maximum execution time encountered for a given worklet.
I also have a small patch, about ready, to get the average.

 
> You'll note that all the functions are reported as "foo+0x0/0xN". 
> There is a way of suppressing the unneeded and unuseful "+0x0/0xN",
> but I forget what it is and the comments over lib/vsprintf.c:pointer()
> didn't help.  I think it's %pS.


I don't know any way to perform this.
%pF and %pS will act pretty much the same, except:

Extract from lib/vsprintf.c:

 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 * function pointers are really function descriptors, which contain a
 * pointer to the real address.

But the output formatting is the same: address, offset, size, modname.

I found it a bit annoying, so I proposed the following patch recently:

http://lkml.org/lkml/2009/4/15/310

And someone came with a better idea, IMO:

http://lkml.org/lkml/2009/4/17/105


> 
> The patchset adds no user documentation for the feature and should not
> (IMO) be merged in such a state.  Please.
>


Ok, I will try something today about the documentation.

Thanks!