linux-kernel - Re: [PATCH v2 0/2] arm64: fix the bugs found in the hugetlb test

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Date:   Tue, 8 Nov 2016 16:36:43 +0000
From:   Will Deacon <will.deacon@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Huang Shijie <shijie.huang@....com>, dwoods@...lanox.com,
        steve.capper@....com, linux-kernel@...r.kernel.org,
        kaly.xin@....com, akpm@...ux-foundation.org, nd@....com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 0/2] arm64: fix the bugs found in the hugetlb test

On Tue, Nov 08, 2016 at 02:09:09PM +0000, Catalin Marinas wrote:
> On Tue, Nov 08, 2016 at 01:44:37PM +0800, Huang Shijie wrote:
> > (3) The test result in the Softiron and Juno-r1 boards:
> > 
> >    This detail test result shows below (both the "make func" & "make stress"):
> > 
> >     4KB granule:
> > 
> >         1.1) PTE + Contiguous bit : 4K x 16 = 64K (per huge page size)
> >              Test result          : PASS
> > 
> >         1.2) PMD                  : 2M x  1 = 2M  (per huge page size)
> >              Test result          : PASS
> > 
> >         1.3) PMD + Contiguous bit : 2M x 16 = 32M (per huge page size)
> >              Test result          : PASS
> > 
> >     64KB granule:
> > 
> >         3.1) PTE + Contiguous bit : 64K x 32 = 2M (per huge page size)
> >              Test result          : PASS
> > 
> >         3.2) PMD + Contiguous bit : 512M x 32 = 16G (per huge page size)
> >              Test result          : no hardware to support this test
> 
> Don't we have support for single (non-contiguous) PMD huge page with 64K
> pages (512M per huge page)? I gave it a try and it seems to work (though
> without your patches applied ;)).
> 
> > Huang Shijie (2):
> >   arm64: hugetlb: remove the wrong pmd check in find_num_contig()
> >   arm64: hugetlb: fix the wrong address for several functions
> 
> For these patches:
> 
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> 
> I'm not sure whether Will plans to push them into 4.9. AFAICT, the
> contiguous huge pages never worked properly, so we may not count it as a
> regression but a new feature. If Will doesn't take them, I'll queue the
> patches for 4.10.

Right, given that it's never worked and the failure only seems to crop up
in synthetic testing, I think you can queue these for 4.10.

Will