On 10/7/20 10:17 PM, Ram Pai wrote:
On Thu, Oct 01, 2020 at 11:17:15AM -0700, Ralph Campbell wrote:
ZONE_DEVICE struct pages have an extra reference count that complicates the
code for put_page() and several places in the kernel that need to check the
reference count to see that a page is not being used (gup, compaction,
migration, etc.). Clean up the code so the reference count doesn't need to
be treated specially for ZONE_DEVICE.
I was hoping this patch would resolve a page-reference issue that we run
into at random times while migrating a page to a device page backed by
secure-memory.
Unfortunately I continue to see the problem. There is a reference
held on that page, which fails the migration.
FYI
RP
I'm willing to look into it but I would need more information.
Can you give any more details about the conditions when it happens?
It would be great if you have a program that reproduces the problem.
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