linux-kernel - Re: [PATCH v3 2/2] proc: add /proc/<pid>/arch

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Message-ID: <20181121095350.GC2149@hirez.programming.kicks-ass.net>
Date:   Wed, 21 Nov 2018 10:53:50 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:     Aubrey Li <aubrey.li@...el.com>, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, ak@...ux.intel.com,
        tim.c.chen@...ux.intel.com, dave.hansen@...el.com,
        arjan@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] proc: add /proc/<pid>/arch_state

On Wed, Nov 21, 2018 at 09:19:36AM +0100, Peter Zijlstra wrote:
> On Wed, Nov 21, 2018 at 09:39:00AM +0800, Li, Aubrey wrote:
> > > Also; you were going to shop around with the other architectures to see
> > > what they want/need for this interface. I see nothing on that.
> > > 
> > I'm open for your suggestion, :)
> 
> Well, we have linux-arch and the various maintainers are also listed in
> MAINTAINERS. Go forth and ask..

Ok, so I googled a wee bit (you could have too).

There's not that many architectures that build big hot chips
(powerpc,x86,arm64,s390) (mips, sparc64 and ia64 are pretty dead I
think, although the Fujitsu Sparc M10 X+/X SIMD looked like it could be
'fun').

Of those, powerpc altivec doesn't seem to be very wide, but you'd have
to ask the power folks. Same for s390 z13.

The Fujitsu/ARM64-SVE stuff looks like it can be big and hot.

And RISC-V has was vector extention, but I don't think anybody is
actually building big hot versions of that just yet.