diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2018-09-18 00:53:05 +0200 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2018-09-18 00:53:05 +0200 |
| commit | bd49212b467c60d6d5e4e2eefc13ec88012ec785 (patch) | |
| tree | f7df1378eb1aefa3177ef590d8e5cbb8367143dc /sys/src/9/port/proc.c | |
| parent | e619a03c28a1bc979faeaa2853c58f94b5c3c5ad (diff) | |
kernel: fix livelock in rebalance (thanks Richard Miller)
Once a second rebalance() is called on cpu0 to adjust priorities,
so cpu-bound processes won't lock others out. However it was only
adjusting processes which were running on cpu0. This was observed
to lead to livelock, eg when a higher-priority process spin-waits
for a lock held by a lower priority one.
Diffstat (limited to 'sys/src/9/port/proc.c')
| -rw-r--r-- | sys/src/9/port/proc.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/sys/src/9/port/proc.c b/sys/src/9/port/proc.c index 5a530395f..4d5b98f6f 100644 --- a/sys/src/9/port/proc.c +++ b/sys/src/9/port/proc.c @@ -478,8 +478,6 @@ another: p = rq->head; if(p == nil) continue; - if(p->mp != MACHP(m->machno)) - continue; if(pri == p->basepri) continue; updatecpu(p); |