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    • /[pkg-src]/trunk/kernel26-alx/patches-2.6.17-r6/0004-2.6.17-sched-staircase16_interactive_tunable.patch

    Contents of /trunk/kernel26-alx/patches-2.6.17-r6/0004-2.6.17-sched-staircase16_interactive_tunable.patch

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    Revision 199 - (show annotations) (download)
    Fri May 18 11:04:36 2007 UTC (16 years, 11 months ago) by niro
    File size: 4299 byte(s) 
    -import
    1 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 include/linux/sysctl.h | 1 +
    12 kernel/sched.c | 8 +++++++-
    13 kernel/sysctl.c | 8 ++++++++
    14 5 files changed, 27 insertions(+), 1 deletion(-)
    15
    16 Index: linux-ck-dev/include/linux/sched.h
    17 ===================================================================
    18 --- linux-ck-dev.orig/include/linux/sched.h 2006-06-18 15:23:05.000000000 +1000
    19 +++ linux-ck-dev/include/linux/sched.h 2006-06-18 15:23:07.000000000 +1000
    20 @@ -202,6 +202,7 @@ extern void show_stack(struct task_struc
    21
    22 void io_schedule(void);
    23 long io_schedule_timeout(long timeout);
    24 +extern int sched_interactive;
    25
    26 extern void cpu_init (void);
    27 extern void trap_init(void);
    28 Index: linux-ck-dev/include/linux/sysctl.h
    29 ===================================================================
    30 --- linux-ck-dev.orig/include/linux/sysctl.h 2006-06-18 15:23:05.000000000 +1000
    31 +++ linux-ck-dev/include/linux/sysctl.h 2006-06-18 15:23:07.000000000 +1000
    32 @@ -148,6 +148,7 @@ enum
    33 KERN_SPIN_RETRY=70, /* int: number of spinlock retries */
    34 KERN_ACPI_VIDEO_FLAGS=71, /* int: flags for setting up video after ACPI sleep */
    35 KERN_IA64_UNALIGNED=72, /* int: ia64 unaligned userland trap enable */
    36 + KERN_INTERACTIVE=73, /* interactive tasks can have cpu bursts */
    37 };
    38
    39
    40 Index: linux-ck-dev/kernel/sysctl.c
    41 ===================================================================
    42 --- linux-ck-dev.orig/kernel/sysctl.c 2006-06-18 15:23:05.000000000 +1000
    43 +++ linux-ck-dev/kernel/sysctl.c 2006-06-18 15:23:07.000000000 +1000
    44 @@ -623,6 +623,14 @@ static ctl_table kern_table[] = {
    45 .mode = 0444,
    46 .proc_handler = &proc_dointvec,
    47 },
    48 + {
    49 + .ctl_name = KERN_INTERACTIVE,
    50 + .procname = "interactive",
    51 + .data = &sched_interactive,
    52 + .maxlen = sizeof (int),
    53 + .mode = 0644,
    54 + .proc_handler = &proc_dointvec,
    55 + },
    56 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
    57 {
    58 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
    59 Index: linux-ck-dev/kernel/sched.c
    60 ===================================================================
    61 --- linux-ck-dev.orig/kernel/sched.c 2006-06-18 15:23:05.000000000 +1000
    62 +++ linux-ck-dev/kernel/sched.c 2006-06-18 15:23:07.000000000 +1000
    63 @@ -58,6 +58,12 @@
    64 #include <asm/unistd.h>
    65
    66 /*
    67 + * sched_interactive - sysctl which allows interactive tasks to have bonus
    68 + * raise its priority.
    69 + */
    70 +int sched_interactive __read_mostly = 1;
    71 +
    72 +/*
    73 * Convert user-nice values [ -20 ... 0 ... 19 ]
    74 * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
    75 * and back.
    76 @@ -731,7 +737,7 @@ static int effective_prio(const task_t *
    77
    78 best_bonus = bonus(p);
    79 prio = MAX_RT_PRIO + best_bonus;
    80 - if (!batch_task(p))
    81 + if (sched_interactive && !batch_task(p))
    82 prio -= p->bonus;
    83
    84 rr = rr_interval(p);
    85 Index: linux-ck-dev/Documentation/sysctl/kernel.txt
    86 ===================================================================
    87 --- linux-ck-dev.orig/Documentation/sysctl/kernel.txt 2006-06-18 15:23:05.000000000 +1000
    88 +++ linux-ck-dev/Documentation/sysctl/kernel.txt 2006-06-18 15:23:07.000000000 +1000
    89 @@ -25,6 +25,7 @@ show up in /proc/sys/kernel:
    90 - domainname
    91 - hostname
    92 - hotplug
    93 +- interactive
    94 - java-appletviewer [ binfmt_java, obsolete ]
    95 - java-interpreter [ binfmt_java, obsolete ]
    96 - l2cr [ PPC only ]
    97 @@ -161,6 +162,15 @@ Default value is "/sbin/hotplug".
    98
    99 ==============================================================
    100
    101 +interactive:
    102 +
    103 +This flag controls the allocation of dynamic priorities in the cpu
    104 +scheduler. It gives low cpu using tasks high priority for lowest
    105 +latencies. Nice value is still observed but stricter cpu proportions
    106 +are obeyed if this tunable is disabled. Enabled by default.
    107 +
    108 +==============================================================
    109 +
    110 l2cr: (PPC only)
    111
    112 This flag controls the L2 cache of G3 processor boards. If