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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-11-19 00:50:35 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-11-19 00:50:35 +0100 |
| commit | d1f39c38df5aee6df6661bcae2c2ca9f79428a8f (patch) | |
| tree | 30144480ea132d44f2e115d74d3c0e2493358e31 | |
| parent | 93cafb79a88ff23696c26c54e5aceff31b6b0a15 (diff) | |
Make scheduling more reactive
Give smaller quantums to processes, to get more frequent context
switches. This fixes some reactivity for concurrent processes.
* kern/sched.h (MIN_QUANTUM): Define to hz / 33.
* kern/sched_prim.c (sched_init): Use MIN_QUANTUM instead of hz / 10.
| -rw-r--r-- | kern/sched.h | 1 | ||||
| -rw-r--r-- | kern/sched_prim.c | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/kern/sched.h b/kern/sched.h index c401f0f5..8a4ec75b 100644 --- a/kern/sched.h +++ b/kern/sched.h @@ -113,6 +113,7 @@ extern queue_head_t action_queue; /* assign/shutdown queue */ decl_simple_lock_data(extern,action_lock); extern int min_quantum; /* defines max context switch rate */ +#define MIN_QUANTUM (hz / 33) /* context switch 33 times/second */ /* * Default base priorities for threads. diff --git a/kern/sched_prim.c b/kern/sched_prim.c index 3834171d..423c6c0e 100644 --- a/kern/sched_prim.c +++ b/kern/sched_prim.c @@ -153,7 +153,7 @@ void sched_init(void) recompute_priorities_timer.fcn = recompute_priorities; recompute_priorities_timer.param = NULL; - min_quantum = hz / 10; /* context switch 10 times/second */ + min_quantum = MIN_QUANTUM; wait_queue_init(); pset_sys_bootstrap(); /* initialize processor mgmt. */ queue_init(&action_queue); |