linux-kernel - Re: [PATCH V3 0/4] mm/debug_vm

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Message-ID: <20200624134808.0c460862@thinkpad>
Date:   Wed, 24 Jun 2020 13:48:08 +0200
From:   Gerald Schaefer <gerald.schaefer@...ibm.com>
To:     Alexander Gordeev <agordeev@...ux.ibm.com>,
        Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm@...ck.org, christophe.leroy@....fr, ziy@...dia.com,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-riscv@...ts.infradead.org, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [PATCH V3 0/4] mm/debug_vm_pgtable: Add some more tests

On Wed, 24 Jun 2020 13:05:39 +0200
Alexander Gordeev <agordeev@...ux.ibm.com> wrote:

> On Wed, Jun 24, 2020 at 08:43:10AM +0530, Anshuman Khandual wrote:
> 
> [...]
> 
> > Hello Gerald/Christophe/Vineet,
> > 
> > It would be really great if you could give this series a quick test
> > on s390/ppc/arc platforms respectively. Thank you.
> 
> That worked for me with the default and debug s390 configurations.
> Would you like to try with some particular options or combinations
> of the options?

It will be enabled automatically on all archs that set
ARCH_HAS_DEBUG_VM_PGTABLE, which we do for s390 unconditionally.
Also, DEBUG_VM has to be set, which we have only in the debug config.
So only the s390 debug config will have it enabled, you can check
dmesg for "debug_vm_pgtable" to see when / where it was run, and if it
triggered any warnings.

I also checked with the v3 series, and it works fine for s390.