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    • /[pkg-src]/trunk/kernel26-alx/patches-2.6.20-r6/0002-2.6.20-sched-staircase17_interactive_tunable.patch

    Contents of /trunk/kernel26-alx/patches-2.6.20-r6/0002-2.6.20-sched-staircase17_interactive_tunable.patch

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    Revision 1175 - (show annotations) (download)
    Thu Oct 14 12:15:46 2010 UTC (13 years, 6 months ago) by niro
    File size: 3719 byte(s) 
    -2.6.20-alx-r6 new magellan 0.5.2 kernel
    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 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