Ticket #1931 (closed bug: fixed)

Opened 2 months ago

Last modified 2 months ago

Negative Modified Page Queue Count

Reported by: bonefish Assigned to: axeld
Priority: critical Milestone: R1/alpha1
Component: System/Kernel Version: R1 development
Cc: Platform: All

Description

r24417, VMware

While running a relatively harmless Perl test the page writer suddenly and unmotivatedly started to hog the CPU. As the attachment shows the count of the modified queue has become -1, which causes the semaphore acquisition to be skipped (sModifiedTemporaryPages is unsigned).

Attachments

kdl-session-berserking-page-writer (4.6 kB) - added by bonefish on 03/17/08 21:18:18.

Change History

03/17/08 21:18:18 changed by bonefish

  • attachment kdl-session-berserking-page-writer added.

03/17/08 21:40:26 changed by bonefish

  • status changed from new to closed.
  • resolution set to fixed.

Probably fixed in r24430. That race condition would be a good explanation at least.