linux-kernel - [PATCH 0/2] mm: devmap: page-freeing related cleanups

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Date:   Thu, 14 Nov 2019 16:11:32 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jérôme Glisse <jglisse@...hat.com>,
        <linux-nvdimm@...ts.01.org>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 0/2] mm: devmap: page-freeing related cleanups

Hi,

Here are the small devmap page-freeing cleanups as requested, so that
they can be reviewed separately from the larger "track dma-pinned pages
series" [1] that they were originally part of.

I did not add Jan Kara's and Jerome Glisse's reviewed-by tags, because those
were for patch 2 but as part of [1], which is different enough from this
series that I couldn't treat it as "close enough".

Testing: Dan notes that his patch (1) has passed nvdimm unit tests. However,
I have not yet done much testing of the two patches together. What
I've done so far is to boot up a system that has CONFIG_DEV_PAGEMAP_OPS=y
and run LTP tests on it, but none of those tests are exercising
free_devmap_managed_page().

Dan, if you could run this combined set through your unit tests, I'd feel
a lot better about it. I'll also work on getting my HMM test setup revived.

[1] https://lore.kernel.org/r/20191113042710.3997854-1-jhubbard@nvidia.com

Dan Williams (1):
  mm: Cleanup __put_devmap_managed_page() vs ->page_free()

John Hubbard (1):
  mm: devmap: refactor 1-based refcounting for ZONE_DEVICE pages

 drivers/nvdimm/pmem.c |  6 ----
 include/linux/mm.h    | 27 +++++++++++++--
 mm/memremap.c         | 76 ++++++++++++++++++++-----------------------
 3 files changed, 60 insertions(+), 49 deletions(-)

-- 
2.24.0