** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone
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https://bugs.launchpad.net/bugs/1400349
Title:
[SRU] new arm64 optimized copy_to_user and copy_from_user assembly
code
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Utopic:
Fix Committed
Bug description:
[Impact]
The copy_{to,from}_user implementations in the Ubuntu kernel are suboptimal.
Optimized implementations have been submitted upstream and have shown a
significant improvement in network performance.
[Test Case]
Generate traffic from one node to another using iperf.
[Regression Risk]
These functions are obviously used heavily throughout the kernel, so a defect
here could have significant impact. This risk is mitigated by using an
implementation heavily based on the linaro string libraries (which are used in
other places already, e.g. glibc), and through active testing of this patch on
real hardware using a trusty-kernel base. The new patch will also undergo
regression testing to ensure the memory corruption issue of the previous patch
does not exist.
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