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    Annotation of /trunk/kernel26-magellan/patches-2.6.21-r4/0010-2.6.21-cfq-iso_idleprio_ionice.patch

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    Revision 222 - (hide annotations) (download)
    Tue Jun 12 08:03:28 2007 UTC (16 years, 11 months ago) by niro
    File size: 1884 byte(s) 
    files for 2.6.21-magellan-r4
    1 niro 222 For SCHED_ISO and SCHED_IDLEPRIO tasks where no ioprio is explicitly set:
    2    
    3     Set ioprio to best priority normal class for SCHED_ISO tasks.
    4    
    5     Set ioprio to idle class for SCHED_IDLEPRIO tasks. Note this means the
    6     SCHED_IDLEPRIO tasks will also get idle usage of I/O by default meaning
    7     no disk reads will be allowed when there is any I/O wait already occurring.
    8    
    9     Signed-off-by: Con Kolivas <kernel@kolivas.org>
    10    
    11     ---
    12     block/cfq-iosched.c | 2 ++
    13     include/linux/ioprio.h | 6 ++++++
    14     2 files changed, 8 insertions(+)
    15    
    16     Index: linux-2.6.21-ck2/include/linux/ioprio.h
    17     ===================================================================
    18     --- linux-2.6.21-ck2.orig/include/linux/ioprio.h 2007-05-14 19:49:54.000000000 +1000
    19     +++ linux-2.6.21-ck2/include/linux/ioprio.h 2007-05-14 19:49:55.000000000 +1000
    20     @@ -56,6 +56,8 @@ static inline enum ioprio_class
    21     {
    22     if (rt_task(task))
    23     return IOPRIO_CLASS_RT;
    24     + if (idleprio_task(task))
    25     + return IOPRIO_CLASS_IDLE;
    26     return IOPRIO_CLASS_BE;
    27     }
    28    
    29     @@ -64,6 +66,10 @@ static inline int task_nice_ioprio(struc
    30     if (rt_task(task))
    31     return (MAX_RT_PRIO - task->rt_priority) * IOPRIO_BE_NR /
    32     (MAX_RT_PRIO + 1);
    33     + if (iso_task(task))
    34     + return 0;
    35     + if (idleprio_task(task))
    36     + return IOPRIO_BE_NR - 1;
    37     return (task_nice(task) + 20) / 5;
    38     }
    39    
    40     Index: linux-2.6.21-ck2/block/cfq-iosched.c
    41     ===================================================================
    42     --- linux-2.6.21-ck2.orig/block/cfq-iosched.c 2007-05-14 19:49:54.000000000 +1000
    43     +++ linux-2.6.21-ck2/block/cfq-iosched.c 2007-05-14 19:49:55.000000000 +1000
    44     @@ -1262,6 +1262,8 @@ static void cfq_init_prio_data(struct cf
    45     */
    46     cfqq->ioprio_class = task_policy_ioprio_class(tsk);
    47     cfqq->ioprio = task_nice_ioprio(tsk);
    48     + if (cfqq->ioprio_class == IOPRIO_CLASS_IDLE)
    49     + cfq_clear_cfqq_idle_window(cfqq);
    50     break;
    51     case IOPRIO_CLASS_RT:
    52     cfqq->ioprio = task_ioprio(tsk);