Hi, Christian,
On 4/8/20 1:53 PM, Thomas Hellström (VMware) wrote:
From: "Thomas Hellstrom (VMware)" <thomas...@shipmail.org>
With amdgpu and CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y, there are
errors like:
BUG: non-zero pgtables_bytes on freeing mm
and:
BUG: Bad rss-counter state
with TTM transparent huge-pages.
Until we've figured out what other TTM drivers do differently compared to
vmwgfx, disable the huge_fault() callback, eliminating transhuge
page-table entries.
Cc: Christian König <christian.koe...@amd.com>
Signed-off-by: Thomas Hellstrom (VMware) <thomas...@shipmail.org>
Reported-by: Alex Xu (Hello71) <alex_y...@yahoo.ca>
Tested-by: Alex Xu (Hello71) <alex_y...@yahoo.ca>
---
Without being able to test and track this down on amdgpu there's little
more than this I can do at the moment. Hopefully I'll be able to test on
nouveau/ttm after getting back from vacation to see if I can reproduce.
It looks like some part of the kernel mistakes a huge page-table entry
for a page directory, and that would be a path that is not hit with vmwgfx.
/Thomas
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