linux-kernel - Re: [PATCH v2 4/4] hugetlb: Do early cow when page pinned on src mm

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Date:   Sun, 7 Feb 2021 10:31:30 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Gal Pressman <galpress@...zon.com>
Cc:     "Zhang, Wei" <wzam@...zon.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kirill Shutemov <kirill@...temov.name>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Matthew Wilcox <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jan Kara <jack@...e.cz>, Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        David Gibson <david@...son.dropbear.id.au>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 4/4] hugetlb: Do early cow when page pinned on src mm

On Sun, Feb 07, 2021 at 11:09:29AM +0200, Gal Pressman wrote:
> On 05/02/2021 17:51, Peter Xu wrote:
> > On Fri, Feb 05, 2021 at 02:58:33PM +0000, Zhang, Wei wrote:
> >> Hi Peter,
> > 
> > Hi, Wei,
> > 
> >>
> >> Gal and I worked together. We tested the patch v2 and can confirm it is working as intended.
> >>
> >> Thank you very much for your quick response!
> > 
> > My thanks too on the quick testing!  Sorry that I'll need to post v3; please
> > feel free to hold off the testing until I got some r-bs with the new version.
> 
> BTW, it might already be fixed in v3, but I encountered a compilation warning
> with this series:
> 
> mm/memory.c: In function ‘copy_present_page’:
> mm/memory.c:800:20: warning: unused variable ‘src_mm’ [-Wunused-variable]
>   struct mm_struct *src_mm = src_vma->vm_mm;
>                     ^~~~~~

Not yet, thanks for raising this, Gal.  I'll wait for some more review feedback
on v3 and send a new version with it fixed.

-- 
Peter Xu