linux-kernel - Re: [patch v2 0/3] OProfile support for System z's hardware sampling

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Date:	Tue, 15 Feb 2011 17:59:29 +0100
From:	Heinz Graalfs <graalfs@...ux.vnet.ibm.com>
To:	Robert Richter <robert.richter@....com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"borntraeger@...ibm.com" <borntraeger@...ibm.com>
Subject: Re: [patch v2 0/3] OProfile support for System z's hardware
 sampling

Hello Robert,

thanks for the positive reply.

Please see my comments below. I suppose I still need some more detailed
directions from you.
Unfortunately I will not be in the office Thursday and Friday.

Heinz

On Mon, 2011-02-14 at 20:42 +0100, Robert Richter wrote:
> Heinz,
> 
> On 21.01.11 05:06:51, Heinz Graalfs wrote:
> > I'm resending yesterday's mail because I missed to specify the correct sender information.
> > 
> > This is a re-posting of the patch series originally posted last month:
> > 
> > http://marc.info/?l=linux-s390&m=129285043619973&w=2
> > 
> > Heinz
> > 
> > Changes in
> > 
> > v2:
> >    - kernel module hwsampler removed, everything is now in oprofile kernel module
> >    - functions from hwsampler-main.c and smpctl.c merged into arch/s390/oprofile/hwsampler.c
> >      - functions made static
> >    - arch/s390/include/asm/hwsampler.h moved to arch/s390/oprofile/hwsampler.h
> >      - structs have now hws_ prefix
> >    - config variables changed, HAVE_HWSAMPLER used only
> >    - original patch 4 (handle_munmap.patch) removed
> 
> thanks for you patches, I have applied them with modifications to:
> 
>  git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile.git s390
> 
> For atomic compilation of single patches I changed patch order and the
> Makefile where necessary. The branch also includes my follow-on
> patches.
> 
> I will be travelling the next weeks and wanted to have this series in
> linux-next now for later inclusion to .39. We would run out of time
> otherwise (my bad). Please review and test the changes I made and send
> me possibly updates.
> 
> Though I applied the patches I want to have the following changes:
> 
> * Merge init.c and hwsampler_file.c, two files are bloated here and
>   hwsampler_file.c is a bad and too long naming.
> 

OK, I've merged all hwsampler_files.c contents into init.c

> * Rework functions in cpu_buffer.c (log_sample,
>   __oprofile_add_ext_sample, oprofile_add_ext_hw_sample, etc.). All
>   the (static) functions can be merged to a single functino by
>   implementing a struct that holds all current function arguments.
>   Something like:
> 
> static void __oprofile_add_ext_sample(struct *foobar fb);
> void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
> {
> 	struct foobar fb = { .regs = regs, .event = event };
> 	__oprofile_add_ext_sample(&fb);
> }

OK, I've done this

> 
>   The naming and description of oprofile_add_ext_hw_sample() is also
>   not the best. As interface in include/linux/oprofile.h we could then
>   merge oprofile_add_ext_sample() and oprofile_add_ext_hw_sample() to
>   a single function.
> 
> It would be nice if you could implement this.

sure, I will do this, however I'm not sure what you exactly mean.
Could you specify the interface in oprofile.h what you basically have in
mind?

> 
> For all patches in the oprofile/s390 branch I also need the
> s390 maintainer's ack.
> 
> Martin or Heiko, please ack.
> 
> Thanks,
> 
> -Robert
> 


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