** Information type changed from Proprietary to Public
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: intel
Status: New => Fix Released
** Changed in: linux (Ubuntu Artful)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1704298
Title:
[Bug] Crystal Ridge - 4.13 - Always enable THP for DAX
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Artful:
Fix Released
Bug description:
Description:
The madvise policy for transparent huge pages is meant to avoid unwanted
allocations of transparent huge pages. It allows a policy of disabling
the extra memory pressure and effort to arrange for a huge page when it
is not needed.
DAX by definition never incurs this overhead since it is statically
allocated. The policy choice makes even less sense for device-dax which
tries to guarantee a given tlb-fault size. Specifically, the following
setting:
echo never > /sys/kernel/mm/transparent_hugepage/enabled
...violates that guarantee and silently disables all device-dax
instances with a 2M or 1G alignment. So, let's avoid that non-obvious
side effect by force enabling thp for dax mappings in all cases.
Target Kernel:4.13
Target Release: 17.10
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