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

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Message-ID: <AE355B8D-8496-4CDF-9BC0-A8D6DE0F9C34@amazon.com>
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:

    CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.



    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