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    Annotation of /trunk/kernel26-alx/patches-2.6.17-r5/0004-2.6.17-sched-staircase16_interactive_tunable.patch

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    Revision 199 - (hide annotations) (download)
    Fri May 18 11:04:36 2007 UTC (17 years ago) by niro
    File size: 4299 byte(s) 
    -import
    1 niro 199 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