From: Jason Gunthorpe <jgg@ziepe.ca>
To: Joao Martins <joao.m.martins@oracle.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-rdma@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Doug Ledford <dledford@redhat.com>,
John Hubbard <jhubbard@nvidia.com>,
Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v3 1/4] mm/gup: add compound page list iterator
Date: Wed, 10 Feb 2021 19:20:10 -0400 [thread overview]
Message-ID: <20210210232010.GT4718@ziepe.ca> (raw)
In-Reply-To: <20210205204127.29441-2-joao.m.martins@oracle.com>
On Fri, Feb 05, 2021 at 08:41:24PM +0000, Joao Martins wrote:
> Add an helper that iterates over head pages in a list of pages. It
> essentially counts the tails until the next page to process has a
> different head that the current. This is going to be used by
> unpin_user_pages() family of functions, to batch the head page refcount
> updates once for all passed consecutive tail pages.
>
> Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
> Reviewed-by: John Hubbard <jhubbard@nvidia.com>
> ---
> mm/gup.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
This can be used for check_and_migrate_cma_pages() too (there is a
series around to change this logic though, not sure if it is landed
yet)
Jason
next prev parent reply other threads:[~2021-02-10 23:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-05 20:41 [PATCH v3 0/4] mm/gup: page unpining improvements Joao Martins
2021-02-05 20:41 ` [PATCH v3 1/4] mm/gup: add compound page list iterator Joao Martins
2021-02-10 23:20 ` Jason Gunthorpe [this message]
2021-02-11 10:45 ` Joao Martins
2021-02-05 20:41 ` [PATCH v3 2/4] mm/gup: decrement head page once for group of subpages Joao Martins
2021-02-10 21:02 ` Jason Gunthorpe
2021-02-11 10:14 ` Joao Martins
2021-02-05 20:41 ` [PATCH v3 3/4] mm/gup: add a range variant of unpin_user_pages_dirty_lock() Joao Martins
2021-02-10 23:15 ` Jason Gunthorpe
2021-02-11 10:24 ` Joao Martins
2021-02-10 23:19 ` John Hubbard
2021-02-11 10:52 ` Joao Martins
2021-02-05 20:41 ` [PATCH v3 4/4] RDMA/umem: batch page unpin in __ib_umem_release() Joao Martins
2021-02-10 23:17 ` Jason Gunthorpe
2021-02-11 10:35 ` Joao Martins
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