Re: [Valgrind-developers] valgrind porting

[<ton...@fu...>]

Dear Mark and developers,

thank you for your reply and sorry for my late reply.

> You don't say what your setup is based on. But from you question below I
> assume it is ARM64 based. Valgrind already does mostly work on ARM64
> (GNU/Linux based at least). You can start with the README_DEVELOPERS to
> get a working setup that you can hack on:

I got some information from the following sites.

> https://sourceware.org/git/?p=valgrind.git;a=blob;f=README_DEVELOPERS
> https://sourceware.org/git/?p=valgrind.git;a=blob;f=cachegrind/cg_arch.c

Cache configuration can be specified with the valgrind options (--I1=, --D1=, ...),
so I think no problem on our architecture A64FX.

I found it difficult for me to support SVE instruction.
We want to profile with Valgrind/Cachegrind on the Fugaku super-computer.
As a future task, could you (community) consider supporting SVE.

Best regards,
Tomotake Nakamura
FUJITSU


> -----Original Message-----
> From: Mark Wielaard <ma...@kl...>
> Sent: Wednesday, May 27, 2020 8:50 PM
> To: Nakamura, Tomotake/中村 朋健 <ton...@fu...>
> Cc: 'val...@li...'
> <val...@li...>
> Subject: Re: [Valgrind-developers] valgrind porting
> 
> Hi,
> 
> On Wed, May 27, 2020 at 02:23:14AM +0000, ton...@fu... wrote:
> > I would like to port Valgrind for Fujitsu supercomputer (FX1000).
> > I'm a beginner and I don't know much about it. Could you please teach me?
> 
> You don't say what your setup is based on. But from you question below I
> assume it is ARM64 based. Valgrind already does mostly work on ARM64
> (GNU/Linux based at least). You can start with the README_DEVELOPERS to
> get a working setup that you can hack on:
> https://sourceware.org/git/?p=valgrind.git;a=blob;f=README_DEVELOPER
> S
> 
> > I don't know the program structure of Valgrind and Cachegrind.
> > My guess is that Cachegrind may be able to obtain information about
> > cache misses, etc. after understanding the hardware specifications of
> > the CPU (cache size, number of ways, etc.).
> > How should the hardware specifications be used as input values to Valgrind?
> 
> You might want to look over cachegrind/cg_arch.c:
> https://sourceware.org/git/?p=valgrind.git;a=blob;f=cachegrind/cg_arch.c
> 
> > I also would like to implement Scalable Vector Extension (SVE)
> > instructions which are an extension instructions of ArmV8. Would you
> > please tell me porting procedures?
> 
> There are several bugs about adding more arm64 instruction sets, you might
> want to start by reading over some:
> https://bugs.kde.org/show_bug.cgi?id=369509
> https://bugs.kde.org/show_bug.cgi?id=413547
> https://bugs.kde.org/show_bug.cgi?id=414268
> 
> Cheers,
> 
> Mark