| commit | 7fb451cb3c27563ba7a952e347f9a12cc68a9a9c | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Sat, 23 Jul 2016 04:58:59 +0000 (22 21:58 -0700) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Sat, 23 Jul 2016 04:58:59 +0000 (22 21:58 -0700) | ||
| tree | 95bd55344b122c733d580ee82621967729369f62 | treesnapshot (tar.gz zip) |
| parent | e47e3dba268d93966c871dfaa6cbbca79038d5bb | commitdiff |
kernel - Fix excessive ipiq recursion (4)
* Possibly the smoking gun. There was a case where the lwkt_switch()
code could wind up looping excessively calling lwkt_getalltokens()
if td_contended went negative, and td_contended on interrupt threads
could in-fact go negative.
This stopped IPIs in their tracks.
* Fix by making td_contended unsigned, causing the comparions to work
in all situations. And add a missing assignment to 0 for the
preempted thread case.
* Possibly the smoking gun. There was a case where the lwkt_switch()
code could wind up looping excessively calling lwkt_getalltokens()
if td_contended went negative, and td_contended on interrupt threads
could in-fact go negative.
This stopped IPIs in their tracks.
* Fix by making td_contended unsigned, causing the comparions to work
in all situations. And add a missing assignment to 0 for the
preempted thread case.
| sys/kern/lwkt_thread.c | diffblobblamehistory | |
| sys/sys/thread.h | diffblobblamehistory |