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    Contents of /trunk/kernel26-alx/patches-2.6.17-r7/0006-2.6.17-sched-range.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: 2708 byte(s) 
    -import
    1 Add SCHED_RANGE and SCHED_RT wrappers for easy policy management.
    2
    3 Signed-off-by: Con Kolivas <kernel@kolivas.org>
    4
    5 include/linux/sched.h | 7 +++++++
    6 kernel/sched.c | 13 +++++--------
    7 2 files changed, 12 insertions(+), 8 deletions(-)
    8
    9 Index: linux-ck-dev/include/linux/sched.h
    10 ===================================================================
    11 --- linux-ck-dev.orig/include/linux/sched.h 2006-06-18 15:23:21.000000000 +1000
    12 +++ linux-ck-dev/include/linux/sched.h 2006-06-18 15:23:35.000000000 +1000
    13 @@ -165,6 +165,13 @@ extern unsigned long weighted_cpuload(co
    14 #define SCHED_RR 2
    15 #define SCHED_BATCH 3
    16
    17 +#define SCHED_MIN 0
    18 +#define SCHED_MAX 3
    19 +
    20 +#define SCHED_RANGE(policy) ((policy) <= SCHED_MAX)
    21 +#define SCHED_RT(policy) ((policy) == SCHED_FIFO || \
    22 + (policy) == SCHED_RR)
    23 +
    24 struct sched_param {
    25 int sched_priority;
    26 };
    27 Index: linux-ck-dev/kernel/sched.c
    28 ===================================================================
    29 --- linux-ck-dev.orig/kernel/sched.c 2006-06-18 15:23:21.000000000 +1000
    30 +++ linux-ck-dev/kernel/sched.c 2006-06-18 15:23:35.000000000 +1000
    31 @@ -3548,7 +3548,7 @@ static void __setscheduler(struct task_s
    32 BUG_ON(task_queued(p));
    33 p->policy = policy;
    34 p->rt_priority = prio;
    35 - if (policy != SCHED_NORMAL && policy != SCHED_BATCH) {
    36 + if (SCHED_RT(policy)) {
    37 p->prio = MAX_RT_PRIO-1 - p->rt_priority;
    38 } else
    39 p->prio = p->static_prio;
    40 @@ -3574,8 +3574,7 @@ recheck:
    41 /* double check policy once rq lock held */
    42 if (policy < 0)
    43 policy = oldpolicy = p->policy;
    44 - else if (policy != SCHED_FIFO && policy != SCHED_RR &&
    45 - policy != SCHED_NORMAL && policy != SCHED_BATCH)
    46 + else if (!SCHED_RANGE(policy))
    47 return -EINVAL;
    48 /*
    49 * Valid priorities for SCHED_FIFO and SCHED_RR are
    50 @@ -3586,8 +3585,7 @@ recheck:
    51 (p->mm && param->sched_priority > MAX_USER_RT_PRIO-1) ||
    52 (!p->mm && param->sched_priority > MAX_RT_PRIO-1))
    53 return -EINVAL;
    54 - if ((policy == SCHED_NORMAL || policy == SCHED_BATCH)
    55 - != (param->sched_priority == 0))
    56 + if ((!SCHED_RT(policy)) != (param->sched_priority == 0))
    57 return -EINVAL;
    58
    59 /*
    60 @@ -3598,12 +3596,11 @@ recheck:
    61 * can't change policy, except between SCHED_NORMAL
    62 * and SCHED_BATCH:
    63 */
    64 - if (((policy != SCHED_NORMAL && p->policy != SCHED_BATCH) &&
    65 - (policy != SCHED_BATCH && p->policy != SCHED_NORMAL)) &&
    66 + if (SCHED_RT(policy) && policy != p->policy &&
    67 !p->signal->rlim[RLIMIT_RTPRIO].rlim_cur)
    68 return -EPERM;
    69 /* can't increase priority */
    70 - if ((policy != SCHED_NORMAL && policy != SCHED_BATCH) &&
    71 + if (SCHED_RT(policy) &&
    72 param->sched_priority > p->rt_priority &&
    73 param->sched_priority >
    74 p->signal->rlim[RLIMIT_RTPRIO].rlim_cur)