4.15 is now available in Bionic. Marking this Fix Released.
** Information type changed from Private to Public
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Tags added: kernel
** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Released
** Changed in: intel
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1730840
Title:
[Feature] Break up long walk of wait queue during wake up
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
Description
In Fujitsu's acceptance test of 8 socket SKX systems, they found that
NMI watchdog timer got triggered in wake_up_page_bit function. The
cause is the long hold time of the wait queue lock to do the wake ups
and traversal of the wait queue. (see LCK-4265)
We created a patch series to break up the long traversal of the wait
queue in wake_up_page_bit. We bookmark the position in the wait queue
after reaching a threshold of wake ups, and release the wait queue
lock to allow other tasks blocked a chance to run (e.g. async wake up
to remove itself from wake queue in finish_wait). Then we resume from
the bookmarked location. This fixes the long spin lock hold time which
triggered the watchdog timer.
Target Kernel: 4.14
Target Release: 18.04
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