/* Give kswapd a realtime priority. */
current->policy = SCHED_FIFO;
current->priority = 32;
Looking at schedule() and goodness() in kernel/sched.c, the scheduling
algorithm does not consider 'counter' and 'priority' if the
'policy' of the task is different from SCHED_OTHER. Indeed in goodness()
we can find:
/*
* Realtime process, select the first one on the
* runqueue (taking priorities within processes
* into account).
*/
if (policy != SCHED_OTHER)
return 1000 + p->rt_priority;
Thus, I propose the following patch:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
--- vmscan.c.orig Wed Jun 24 18:43:04 1998
+++ vmscan.c Wed Jun 24 18:43:19 1998
@@ -532,7 +532,7 @@
/* Give kswapd a realtime priority. */
current->policy = SCHED_FIFO;
- current->priority = 32; /* Fixme --- we need to standardise our
+ current->rt_priority = 32; /* Fixme --- we need to standardise our
namings for POSIX.4 realtime scheduling
priorities. */
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Best regards,
Marco Cesati
+---------------------------------------------------------------+
| Computer Engineering - Project BRAVO |
+---------------------------------------------------------------+
| University of Rome "Tor Vergata" |
| Dept. of Computer Science, Systems and Industrial Engineering |
| via di Tor Vergata, 00133 Rome (Italy) |
| e-mail: bravo@russell.ce.uniroma2.it |
+---------------------------------------------------------------+
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