linux-kernel - Re: [PATCH v5 0/5] mm/hugetlb: Early cow on fork, and a few cleanups

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Date:   Tue, 2 Mar 2021 00:59:40 +0000
From:   "Zhang, Wei" <wzam@...zon.com>
To:     Jason Gunthorpe <jgg@...pe.ca>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Peter Xu <peterx@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Pressman, Gal" <galpress@...zon.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Mike Kravetz" <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Jann Horn <jannh@...gle.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        "Kirill Shutemov" <kirill@...temov.name>,
        Miaohe Lin <linmiaohe@...wei.com>,
        "Andrea Arcangeli" <aarcange@...hat.com>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v5 0/5] mm/hugetlb: Early cow on fork, and a few cleanups


Yes, such user includes libfabric (https://ofiwg.github.io/libfabric/) . which uses hugetlb pages.
 
On 3/1/21, 4:30 PM, "Jason Gunthorpe" <jgg@...pe.ca> wrote:

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    On Mon, Mar 01, 2021 at 04:28:46PM -0800, Andrew Morton wrote:
    > On Mon, 1 Mar 2021 09:11:51 -0500 Peter Xu <peterx@...hat.com> wrote:
    >
    > > On Wed, Feb 17, 2021 at 06:35:42PM -0500, Peter Xu wrote:
    > > > v5:
    > > > - patch 4: change "int cow" into "bool cow"
    > > > - collect r-bs for Jason
    > >
    > > Andrew,
    > >
    > > I just noticed 5.12-rc1 has released; is this series still possible to make it
    > > for 5.12, or needs to wait for 5.13?
    > >
    >
    > It has taken a while to settle down.  What is the case for
    > fast-tracking it into 5.12?

    IIRC hugetlb users and fork and DMA will get the unexpected VA
    corruption that triggered all this work.

    Jason