On Wed, Nov 24, 2021 at 07:09:59PM +, Joao Martins wrote:
> Add a new @vmemmap_shift property for struct dev_pagemap which specifies that
> a
> devmap is composed of a set of compound pages of order @vmemmap_shift,
> instead of
> base pages. When a compound page devmap is requested, all but t
On Wed, 24 Nov 2021 14:30:56 -0800 Dan Williams
wrote:
> It might end up colliding with some of the DAX cleanups that are
> brewing, but if that happens I might apply them to resolve conflicts
> and ask Andrew to drop them out of -mm. We can cross that bridge
> later.
Yep, not a problem.
On Wed, Nov 24, 2021 at 11:10 AM Joao Martins wrote:
>
> Changes since v5[9]:
>
> * Keep @dev on the previous line to improve readability on
> patch 5 (Christoph Hellwig)
> * Document is_static() function to clarify what are static and
> dynamic dax regions in patch 7 (Christoph Hellwig)
> * Deduc
Use the newly added compound devmap facility which maps the assigned dax
ranges as compound pages at a page size of @align.
dax devices are created with a fixed @align (huge page size) which is
enforced through as well at mmap() of the device. Faults, consequently
happen too at the specified @alig
Normally, the @page mapping is set prior to inserting the page into a
page table entry. Make device-dax adhere to the same ordering, rather
than setting mapping after the PTE is inserted.
The address_space never changes and it is always associated with the
same inode and underlying pages. So, the
Use the struct_size() helper for the size of a struct with variable array
member at the end, rather than manually calculating it.
Suggested-by: Dan Williams
Signed-off-by: Joao Martins
---
drivers/dax/device.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/dax/
Move initialization of page->mapping into a separate helper.
This is in preparation to move the mapping set to be prior
to inserting the page table entry and also for tidying up
compound page handling into one helper.
Signed-off-by: Joao Martins
---
drivers/dax/device.c | 45 +++
Right now, only static dax regions have a valid @pgmap pointer in its
struct dev_dax. Dynamic dax case however, do not.
In preparation for device-dax compound devmap support, make sure that
dev_dax pgmap field is set after it has been allocated and initialized.
dynamic dax device have the @pgmap
Rather than calculating @pgoff manually, switch to ALIGN() instead.
Suggested-by: Dan Williams
Signed-off-by: Joao Martins
Reviewed-by: Dan Williams
---
drivers/dax/device.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
inde
Move struct page init to an helper function __init_zone_device_page().
This is in preparation for sharing the storage for compound page
metadata.
Signed-off-by: Joao Martins
Reviewed-by: Dan Williams
---
mm/page_alloc.c | 74 +++--
1 file changed, 41
), it
is a known issue that this commit broke efi_fake_mem=.
Patches apply on top of linux-next tag next-20211124 (commit 4b74e088fef6).
Thanks for all the review so far.
As always, Comments and suggestions very much appreciated!
Older Changelog,
v4[4] -> v5[9]:
* Remove patches 8-14 as they w
Add a new @vmemmap_shift property for struct dev_pagemap which specifies that a
devmap is composed of a set of compound pages of order @vmemmap_shift, instead
of
base pages. When a compound page devmap is requested, all but the first
page are initialised as tail pages instead of order-0 pages.
Fo
Split the utility function prep_compound_page() into head and tail
counterparts, and use them accordingly.
This is in preparation for sharing the storage for compound page
metadata.
Signed-off-by: Joao Martins
Acked-by: Mike Kravetz
Reviewed-by: Dan Williams
Reviewed-by: Muchun Song
---
mm/p
memory_failure_dev_pagemap() at the moment assumes base pages (e.g.
dax_lock_page()). For devmap with compound pages fetch the
compound_head in case a tail page memory failure is being handled.
Currently this is a nop, but in the advent of compound pages in
dev_pagemap it allows memory_failure_de
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