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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1309221
Title:
transparent hugepages flaky on arm64
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
linux 3.13.0-24.46
transparent hugepages, which are configured on by default in Ubuntu,
are flaky on arm64. The most evident system is that go processes
reliably hang or crash. This has been observed with both building
juju-core with gccgo, and running the resulting juju binaries.
The root cause of this is that get_user_pages_fast is not yet
implemented on arm64 (and arm64). Patches are floating around, but
haven't landed.
http://comments.gmane.org/gmane.linux.ports.arm.kernel/299268
We've verified that either applying those patches, or disabling THP
via sysfs, prevents the above issues.
At minimum we should change the default boottime sysfs setting for THP
to "never" until we can fix this feature properly.
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