linux-kernel - Re: [PATCH 00/12] Avoid synchronous TLB invalidation for intermediate page-table entries on arm64

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Message-ID: <20180831203234.7b8f4d13@roar.ozlabs.ibm.com>
Date:   Fri, 31 Aug 2018 20:32:34 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Will Deacon <will.deacon@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Benjamin Herrenschmidt <benh@....ibm.com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 00/12] Avoid synchronous TLB invalidation for
 intermediate page-table entries on arm64

On Fri, 31 Aug 2018 12:10:14 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> On Fri, Aug 31, 2018 at 10:54:18AM +0100, Will Deacon wrote:
> 
> > Proposal below (omitted Linus because that seems to be the pattern elsewhere
> > in the file and he's not going to shout at himself when things break :)
> > Anybody I've missed?
> > 
> > Will
> >   
> > --->8  
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index a5b256b25905..7224b5618883 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -9681,6 +9681,15 @@ S:	Maintained
> >  F:	arch/arm/boot/dts/mmp*
> >  F:	arch/arm/mach-mmp/
> >  
> > +MMU GATHER AND TLB INVALIDATION
> > +M:	Will Deacon <will.deacon@....com>
> > +M:	Nick Piggin <npiggin@...il.com>

Oh gee, I suppose. powerpc hash is kind of interesting because it's
crazy, Aneesh knows that code a lot better than I do. radix modulo
some minor details of exact instructions is fairly like x86 (he 
wrote a lot of that code too AFAIK).

> > +M:	Peter Zijlstra <peterz@...radead.org>
> > +L:	linux-arch@...r.kernel.org

Maybe put linux-mm as well? Or should there just be one list?

> > +S:	Maintained
> > +F:	include/asm-generic/tlb.h
> > +F:	arch/*/include/asm/tlb.h
> > +
> >  MN88472 MEDIA DRIVER
> >  M:	Antti Palosaari <crope@....fi>
> >  L:	linux-media@...r.kernel.org  
> 
> If we're going to do that (and I'm not opposed); it might make sense to
> do something like the below and add:
> 
>  F:  mm/mmu_gather.c

I think that is a good idea regardless. How do feel about calling it
tlb.c? Easier to type and autocompletes sooner.

> 
> ---
>  b/mm/mmu_gather.c         |  250 ++++++++++++++++++++++++++++++++++++++++++++++
>  include/asm-generic/tlb.h |    2 
>  mm/Makefile               |    2 
>  mm/memory.c               |  247 ---------------------------------------------