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Message-ID: <e3029aca-f487-225b-7a78-7712c4c465a6@oracle.com> Date: Mon, 8 Feb 2021 16:09:26 -0800 From: Mike Kravetz <mike.kravetz@...cle.com> To: Peter Xu <peterx@...hat.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: Gal Pressman <galpress@...zon.com>, Andrea Arcangeli <aarcange@...hat.com>, Christoph Hellwig <hch@....de>, Miaohe Lin <linmiaohe@...wei.com>, Kirill Shutemov <kirill@...temov.name>, Jann Horn <jannh@...gle.com>, Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>, Jason Gunthorpe <jgg@...pe.ca>, Linus Torvalds <torvalds@...ux-foundation.org>, Mike Rapoport <rppt@...ux.vnet.ibm.com>, David Gibson <david@...son.dropbear.id.au>, Kirill Tkhai <ktkhai@...tuozzo.com>, Wei Zhang <wzam@...zon.com>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH v3 5/5] hugetlb: Do early cow when page pinned on src mm On 2/5/21 8:54 AM, Peter Xu wrote: > This is the last missing piece of the COW-during-fork effort when there're > pinned pages found. One can reference 70e806e4e645 ("mm: Do early cow for > pinned pages during fork() for ptes", 2020-09-27) for more information, since > we do similar things here rather than pte this time, but just for hugetlb. Thanks for all the changes, the patch looks much better. I did not look at 70e806e4e645 in detail until now. That commit had the 'write protect trick' which was removed in subsequent commits. It took me a bit of git history tracking to figure out the state of that code today and the reasons for the subsequent changes. I guess that was a good way to educate me. :) > > Signed-off-by: Peter Xu <peterx@...hat.com> > --- > mm/hugetlb.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 62 insertions(+), 4 deletions(-) Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com> -- Mike Kravetz
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