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    • /[pkg-src]/trunk/kernel26-alx/patches-2.6.20-r6/0010-2.6.20-cfq-ioprio_inherit_rt_class.patch

    Contents of /trunk/kernel26-alx/patches-2.6.20-r6/0010-2.6.20-cfq-ioprio_inherit_rt_class.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: 2105 byte(s) 
    -2.6.20-alx-r6 new magellan 0.5.2 kernel
    1 If a realtime task does not explicitly set an ioprio make it inherit the
    2 realtime class and a priority dependant on its realtime priority.
    3
    4 Signed-off-by: Con Kolivas <kernel@kolivas.org>
    5
    6 ---
    7 block/cfq-iosched.c | 4 ++--
    8 include/linux/ioprio.h | 13 ++++++++++++-
    9 2 files changed, 14 insertions(+), 3 deletions(-)
    10
    11 Index: linux-2.6.20-ck1/block/cfq-iosched.c
    12 ===================================================================
    13 --- linux-2.6.20-ck1.orig/block/cfq-iosched.c 2007-02-05 22:52:00.000000000 +1100
    14 +++ linux-2.6.20-ck1/block/cfq-iosched.c 2007-02-16 19:01:32.000000000 +1100
    15 @@ -1211,10 +1211,10 @@ static void cfq_init_prio_data(struct cf
    16 printk(KERN_ERR "cfq: bad prio %x\n", ioprio_class);
    17 case IOPRIO_CLASS_NONE:
    18 /*
    19 - * no prio set, place us in the middle of the BE classes
    20 + * Select class and ioprio according to policy and nice
    21 */
    22 + cfqq->ioprio_class = task_policy_ioprio_class(tsk);
    23 cfqq->ioprio = task_nice_ioprio(tsk);
    24 - cfqq->ioprio_class = IOPRIO_CLASS_BE;
    25 break;
    26 case IOPRIO_CLASS_RT:
    27 cfqq->ioprio = task_ioprio(tsk);
    28 Index: linux-2.6.20-ck1/include/linux/ioprio.h
    29 ===================================================================
    30 --- linux-2.6.20-ck1.orig/include/linux/ioprio.h 2006-09-21 19:54:58.000000000 +1000
    31 +++ linux-2.6.20-ck1/include/linux/ioprio.h 2007-02-16 19:01:32.000000000 +1100
    32 @@ -22,7 +22,7 @@
    33 * class, the default for any process. IDLE is the idle scheduling class, it
    34 * is only served when no one else is using the disk.
    35 */
    36 -enum {
    37 +enum ioprio_class {
    38 IOPRIO_CLASS_NONE,
    39 IOPRIO_CLASS_RT,
    40 IOPRIO_CLASS_BE,
    41 @@ -51,8 +51,19 @@ static inline int task_ioprio(struct tas
    42 return IOPRIO_PRIO_DATA(task->ioprio);
    43 }
    44
    45 +static inline enum ioprio_class
    46 + task_policy_ioprio_class(struct task_struct *task)
    47 +{
    48 + if (rt_task(task))
    49 + return IOPRIO_CLASS_RT;
    50 + return IOPRIO_CLASS_BE;
    51 +}
    52 +
    53 static inline int task_nice_ioprio(struct task_struct *task)
    54 {
    55 + if (rt_task(task))
    56 + return (MAX_RT_PRIO - task->rt_priority) * IOPRIO_BE_NR /
    57 + (MAX_RT_PRIO + 1);
    58 return (task_nice(task) + 20) / 5;
    59 }
    60