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Revision Log
Revision 1175 -
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Thu Oct 14 12:15:46 2010 UTC (13 years, 7 months ago) by niro
File size: 3719 byte(s)
Thu Oct 14 12:15:46 2010 UTC (13 years, 7 months ago) by niro
File size: 3719 byte(s)
-2.6.20-alx-r6 new magellan 0.5.2 kernel
| 1 | niro | 1175 | Add the interactive tunable for the staircase cpu scheduler. The default |
| 2 | behaviour is for nice value to determine cpu proportion only, and wakeup | ||
| 3 | latency is determined by the percentage of the cpu entitlement of a task. The | ||
| 4 | interactive tunable modifies this behaviour such that nice value determines | ||
| 5 | both cpu proportion and wakeup latency. | ||
| 6 | |||
| 7 | Signed-off-by: Con Kolivas <kernel@kolivas.org> | ||
| 8 | |||
| 9 | Documentation/sysctl/kernel.txt | 10 ++++++++++ | ||
| 10 | include/linux/sched.h | 1 + | ||
| 11 | kernel/sched.c | 8 +++++++- | ||
| 12 | kernel/sysctl.c | 8 ++++++++ | ||
| 13 | 4 files changed, 26 insertions(+), 1 deletion(-) | ||
| 14 | |||
| 15 | Index: linux-2.6.20-ck1/include/linux/sched.h | ||
| 16 | =================================================================== | ||
| 17 | --- linux-2.6.20-ck1.orig/include/linux/sched.h 2007-02-16 19:01:30.000000000 +1100 | ||
| 18 | +++ linux-2.6.20-ck1/include/linux/sched.h 2007-02-16 19:01:30.000000000 +1100 | ||
| 19 | @@ -216,6 +216,7 @@ extern void show_stack(struct task_struc | ||
| 20 | |||
| 21 | void io_schedule(void); | ||
| 22 | long io_schedule_timeout(long timeout); | ||
| 23 | +extern int sched_interactive; | ||
| 24 | |||
| 25 | extern void cpu_init (void); | ||
| 26 | extern void trap_init(void); | ||
| 27 | Index: linux-2.6.20-ck1/kernel/sysctl.c | ||
| 28 | =================================================================== | ||
| 29 | --- linux-2.6.20-ck1.orig/kernel/sysctl.c 2007-02-05 22:52:04.000000000 +1100 | ||
| 30 | +++ linux-2.6.20-ck1/kernel/sysctl.c 2007-02-16 19:01:30.000000000 +1100 | ||
| 31 | @@ -676,6 +676,14 @@ static ctl_table kern_table[] = { | ||
| 32 | .mode = 0444, | ||
| 33 | .proc_handler = &proc_dointvec, | ||
| 34 | }, | ||
| 35 | + { | ||
| 36 | + .ctl_name = CTL_UNNUMBERED, | ||
| 37 | + .procname = "interactive", | ||
| 38 | + .data = &sched_interactive, | ||
| 39 | + .maxlen = sizeof (int), | ||
| 40 | + .mode = 0644, | ||
| 41 | + .proc_handler = &proc_dointvec, | ||
| 42 | + }, | ||
| 43 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) | ||
| 44 | { | ||
| 45 | .ctl_name = KERN_UNKNOWN_NMI_PANIC, | ||
| 46 | Index: linux-2.6.20-ck1/kernel/sched.c | ||
| 47 | =================================================================== | ||
| 48 | --- linux-2.6.20-ck1.orig/kernel/sched.c 2007-02-16 19:01:30.000000000 +1100 | ||
| 49 | +++ linux-2.6.20-ck1/kernel/sched.c 2007-02-16 19:01:30.000000000 +1100 | ||
| 50 | @@ -61,6 +61,12 @@ | ||
| 51 | #include <asm/unistd.h> | ||
| 52 | |||
| 53 | /* | ||
| 54 | + * sched_interactive - sysctl which allows interactive tasks to have bonus | ||
| 55 | + * raise its priority. | ||
| 56 | + */ | ||
| 57 | +int sched_interactive __read_mostly = 1; | ||
| 58 | + | ||
| 59 | +/* | ||
| 60 | * Convert user-nice values [ -20 ... 0 ... 19 ] | ||
| 61 | * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ], | ||
| 62 | * and back. | ||
| 63 | @@ -867,7 +873,7 @@ static inline int __normal_prio(struct t | ||
| 64 | |||
| 65 | best_bonus = bonus(p); | ||
| 66 | prio = MAX_RT_PRIO + best_bonus; | ||
| 67 | - if (!batch_task(p)) | ||
| 68 | + if (sched_interactive && !batch_task(p)) | ||
| 69 | prio -= p->bonus; | ||
| 70 | |||
| 71 | rr = rr_interval(p); | ||
| 72 | Index: linux-2.6.20-ck1/Documentation/sysctl/kernel.txt | ||
| 73 | =================================================================== | ||
| 74 | --- linux-2.6.20-ck1.orig/Documentation/sysctl/kernel.txt 2007-02-05 22:51:59.000000000 +1100 | ||
| 75 | +++ linux-2.6.20-ck1/Documentation/sysctl/kernel.txt 2007-02-16 19:01:30.000000000 +1100 | ||
| 76 | @@ -25,6 +25,7 @@ show up in /proc/sys/kernel: | ||
| 77 | - domainname | ||
| 78 | - hostname | ||
| 79 | - hotplug | ||
| 80 | +- interactive | ||
| 81 | - java-appletviewer [ binfmt_java, obsolete ] | ||
| 82 | - java-interpreter [ binfmt_java, obsolete ] | ||
| 83 | - kstack_depth_to_print [ X86 only ] | ||
| 84 | @@ -164,6 +165,15 @@ Default value is "/sbin/hotplug". | ||
| 85 | |||
| 86 | ============================================================== | ||
| 87 | |||
| 88 | +interactive: | ||
| 89 | + | ||
| 90 | +This flag controls the allocation of dynamic priorities in the cpu | ||
| 91 | +scheduler. It gives low cpu using tasks high priority for lowest | ||
| 92 | +latencies. Nice value is still observed but stricter cpu proportions | ||
| 93 | +are obeyed if this tunable is disabled. Enabled by default. | ||
| 94 | + | ||
| 95 | +============================================================== | ||
| 96 | + | ||
| 97 | l2cr: (PPC only) | ||
| 98 | |||
| 99 | This flag controls the L2 cache of G3 processor boards. If |