linux-kernel - Re: [PATCH v2 11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing

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Message-ID: <3dc42edc28b11e4d5db385a54fb42504200419e5.camel@linux.ibm.com>
Date:   Tue, 24 Sep 2019 18:23:18 -0300
From:   Leonardo Bras <leonardo@...ux.ibm.com>
To:     jhubbard@...dia.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     dan.j.williams@...el.com, arnd@...db.de, jgg@...pe.ca,
        gregkh@...uxfoundation.org, mahesh@...ux.vnet.ibm.com,
        yuehaibing@...wei.com, npiggin@...il.com, rppt@...ux.ibm.com,
        keith.busch@...el.com, rfontana@...hat.com, paulus@...ba.org,
        aneesh.kumar@...ux.ibm.com, ganeshgr@...ux.ibm.com,
        tglx@...utronix.de, ira.weiny@...el.com, akpm@...ux-foundation.org,
        allison@...utok.net
Subject: Re: [PATCH v2 11/11] powerpc/mm/book3s64/pgtable: Uses counting
 method to skip serializing

John Hubbard <jhubbard@...dia.com> writes:

>> Is that what you meant?
>
> Yes.
>

I am still trying to understand this issue.

I am also analyzing some cases where interrupt disable is not done
before the lockless pagetable walk (patch 3 discussion).

But given I forgot to add the mm mailing list before, I think it would
be wiser to send a v3 and gather feedback while I keep trying to
understand how it works, and if it needs additional memory barrier here.

Thanks!

Leonardo Bras

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