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    Subject[PATCH] optional non-interactive mode for cpu scheduler
    optional non-interactive mode for cpu scheduler


    Some environments desire strict control over cpu resources based on nice
    values without interactive determination.

    Add a sysctl (/proc/sys/kernel/interactive) to disable dynamic priority
    behaviour and interactive reinsertion.

    Signed-off-by: Con Kolivas <kernel@kolivas.org>


    Index: linux-2.6.10-rc1-mm2/include/linux/sched.h
    ===================================================================
    --- linux-2.6.10-rc1-mm2.orig/include/linux/sched.h 2004-11-02 13:20:03.000000000 +1100
    +++ linux-2.6.10-rc1-mm2/include/linux/sched.h 2004-11-02 16:03:53.807209246 +1100
    @@ -738,6 +738,7 @@ extern int task_prio(const task_t *p);
    extern int task_nice(const task_t *p);
    extern int task_curr(const task_t *p);
    extern int idle_cpu(int cpu);
    +extern int sched_interactive;

    void yield(void);

    Index: linux-2.6.10-rc1-mm2/include/linux/sysctl.h
    ===================================================================
    --- linux-2.6.10-rc1-mm2.orig/include/linux/sysctl.h 2004-11-02 13:19:19.000000000 +1100
    +++ linux-2.6.10-rc1-mm2/include/linux/sysctl.h 2004-11-02 16:07:46.071023189 +1100
    @@ -134,6 +134,7 @@ enum
    KERN_SPARC_SCONS_PWROFF=64, /* int: serial console power-off halt */
    KERN_HZ_TIMER=65, /* int: hz timer on or off */
    KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
    + KERN_INTERACTIVE=67, /* int: dynamic priorities */
    };


    Index: linux-2.6.10-rc1-mm2/kernel/sched.c
    ===================================================================
    --- linux-2.6.10-rc1-mm2.orig/kernel/sched.c 2004-11-02 14:52:51.000000000 +1100
    +++ linux-2.6.10-rc1-mm2/kernel/sched.c 2004-11-02 16:13:48.419712248 +1100
    @@ -150,8 +150,8 @@
    #define DELTA(p) \
    (SCALE(TASK_NICE(p), 40, MAX_BONUS) + INTERACTIVE_DELTA)

    -#define TASK_INTERACTIVE(p) \
    - ((p)->prio <= (p)->static_prio - DELTA(p))
    +#define TASK_INTERACTIVE(p) ((sched_interactive) && \
    + ((p)->prio <= (p)->static_prio - DELTA(p)))

    #define INTERACTIVE_SLEEP(p) \
    (JIFFIES_TO_NS(MAX_SLEEP_AVG * \
    @@ -602,6 +602,13 @@ static inline void enqueue_task_head(str
    }

    /*
    + * This is a sysctl which allows dynamic priorities to be applied based on
    + * interactive behaviour, and selective interactive reinsertion into the
    + * active array despite timeslice expiration.
    + */
    +int sched_interactive = 1;
    +
    +/*
    * effective_prio - return the priority that is based on the static
    * priority but is modified by bonuses/penalties.
    *
    @@ -622,6 +629,10 @@ static int effective_prio(task_t *p)
    if (rt_task(p))
    return p->prio;

    + /* Dynamic priorities are not used with interactive mode off */
    + if (!sched_interactive)
    + return p->static_prio;
    +
    bonus = CURRENT_BONUS(p) - MAX_BONUS / 2;

    prio = p->static_prio - bonus;
    Index: linux-2.6.10-rc1-mm2/kernel/sysctl.c
    ===================================================================
    --- linux-2.6.10-rc1-mm2.orig/kernel/sysctl.c 2004-11-02 13:19:19.000000000 +1100
    +++ linux-2.6.10-rc1-mm2/kernel/sysctl.c 2004-11-02 16:06:27.621555227 +1100
    @@ -624,6 +624,14 @@ static ctl_table kern_table[] = {
    .proc_handler = &proc_unknown_nmi_panic,
    },
    #endif
    + {
    + .ctl_name = KERN_INTERACTIVE,
    + .procname = "interactive",
    + .data = &sched_interactive,
    + .maxlen = sizeof (int),
    + .mode = 0644,
    + .proc_handler = &proc_dointvec,
    + },
    { .ctl_name = 0 }
    };

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