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    Contents of /trunk/kernel26-magellan/patches-2.6.16-r10/0005-2.6.16-sched-add-discrete-weighted-cpu-load-function.patch

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    Revision 70 - (show annotations) (download)
    Thu May 11 19:09:22 2006 UTC (18 years ago) by niro
    File size: 4755 byte(s) 
    import
    1 From akpm@osdl.org Tue Mar 14 12:58:09 2006
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    17 Mon, 13 Mar 2006 18:00:33 -0800
    18 Message-Id: <200603140200.k2E20Xmt004571@shell0.pdx.osdl.net>
    19 Subject: + sched-add-discrete-weighted-cpu-load-function.patch added to -mm tree
    20 To: kernel@kolivas.org,
    21 mingo@elte.hu,
    22 mm-commits@vger.kernel.org
    23 From: akpm@osdl.org
    24 Date: Mon, 13 Mar 2006 17:58:09 -0800
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    35 detect+patch, 0.00010,
    36 hu+Signed, 0.00010,
    37 cpus+and, 0.00010,
    38 group+cpumask, 0.00010,
    39 group+cpumask, 0.00010,
    40 int+task, 0.00010,
    41 sched+add, 0.00010,
    42 sched+add, 0.00010,
    43 on+runqueue, 0.00010,
    44 sched+extern, 0.00010,
    45 idlest, 0.00010,
    46 Subject*load, 0.00010,
    47 load+max, 0.00010,
    48 load+max, 0.00010,
    49 is+sched, 0.00010,
    50 runqueue+find, 0.00010,
    51 sched+cleanup, 0.00010,
    52 cpus+allowed, 0.00010,
    53 sched+implement, 0.00010,
    54 smpnice+patch, 0.00010,
    55 To*org+mingo, 0.00010,
    56 Subject*load+function, 0.00010,
    57 noninteractive+use, 0.00010,
    58 load+per, 0.00010,
    59 nr+uninterruptible, 0.00010,
    60 alter+uninterruptible, 0.00010,
    61 puN+include, 0.00010
    62 X-Length: 5468
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    66 Content-Type:
    67 X-UID: 9778
    68
    69
    70 The patch titled
    71
    72 sched: add discrete weighted cpu load function
    73
    74 has been added to the -mm tree. Its filename is
    75
    76 sched-add-discrete-weighted-cpu-load-function.patch
    77
    78 See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
    79 out what to do about this
    80
    81
    82 From: Con Kolivas <kernel@kolivas.org>
    83
    84 When the type of weighting is known to be zero we can use a simpler version
    85 of source_load with a weighted_cpuload() function. Export that function to
    86 allow relative weighted cpu load to be used by other subsystems if desired.
    87
    88 Signed-off-by: Con Kolivas <kernel@kolivas.org>
    89 Acked-by: Ingo Molnar <mingo@elte.hu>
    90 Signed-off-by: Andrew Morton <akpm@osdl.org>
    91 include/linux/sched.h | 1 +
    92 kernel/sched.c | 10 ++++++++--
    93 2 files changed, 9 insertions(+), 2 deletions(-)
    94
    95 Index: linux-2.6.16-ck1/include/linux/sched.h
    96 ===================================================================
    97 --- linux-2.6.16-ck1.orig/include/linux/sched.h 2006-03-20 20:46:46.000000000 +1100
    98 +++ linux-2.6.16-ck1/include/linux/sched.h 2006-03-20 20:46:46.000000000 +1100
    99 @@ -100,6 +100,7 @@ extern int nr_processes(void);
    100 extern unsigned long nr_running(void);
    101 extern unsigned long nr_uninterruptible(void);
    102 extern unsigned long nr_iowait(void);
    103 +extern unsigned long weighted_cpuload(const int cpu);
    104
    105 #include <linux/time.h>
    106 #include <linux/param.h>
    107 Index: linux-2.6.16-ck1/kernel/sched.c
    108 ===================================================================
    109 --- linux-2.6.16-ck1.orig/kernel/sched.c 2006-03-20 20:46:46.000000000 +1100
    110 +++ linux-2.6.16-ck1/kernel/sched.c 2006-03-20 20:46:46.000000000 +1100
    111 @@ -919,6 +919,12 @@ inline int task_curr(const task_t *p)
    112 return cpu_curr(task_cpu(p)) == p;
    113 }
    114
    115 +/* Used instead of source_load when we know the type == 0 */
    116 +unsigned long weighted_cpuload(const int cpu)
    117 +{
    118 + return cpu_rq(cpu)->raw_weighted_load;
    119 +}
    120 +
    121 #ifdef CONFIG_SMP
    122 typedef struct {
    123 struct list_head list;
    124 @@ -1119,7 +1125,7 @@ find_idlest_cpu(struct sched_group *grou
    125 cpus_and(tmp, group->cpumask, p->cpus_allowed);
    126
    127 for_each_cpu_mask(i, tmp) {
    128 - load = source_load(i, 0);
    129 + load = weighted_cpuload(i);
    130
    131 if (load < min_load || (load == min_load && i == this_cpu)) {
    132 min_load = load;
    133 @@ -2184,7 +2190,7 @@ static runqueue_t *find_busiest_queue(st
    134 int i;
    135
    136 for_each_cpu_mask(i, group->cpumask) {
    137 - load = source_load(i, 0);
    138 + load = weighted_cpuload(i);
    139
    140 if (load > max_load) {
    141 max_load = load;