Comment 538 for bug 620074
Revision history for this message
|
|
#538 |
© 2004
Canonical Ltd.
•
Terms of use
•
Data privacy
•
Contact Launchpad Support
•
Blog
•
Careers
•
System status
•
4d1350f
(Get the code!)
(In reply to comment #524)
> But this is still the 12309 bug, isn't it?
No.
However, this bug report has turned into a dumping ground for anyone experiencing any lagginess, regardless of cause. The actual bug here is related to the kernel preferring to evict memory-mapped executable pages when a process dirties blocks faster than they can be flushed to disk. The apparent hangs in responsiveness are due to threads (particularly GUI threads) triggering page faults and being unable to make progress until their code is re-fetched from disk. The fix should be to block the writing process from dirtying any more blocks well before the kernel starts evicting mapped executable pages from memory, but so far no one has been able to make it work correctly in all cases (afaik).