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    Annotation of /trunk/kernel26-magellan/patches-2.6.20-r5/0014-2.6.20-sched-add-above-background-load-function.patch

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    Revision 133 - (hide annotations) (download)
    Fri Apr 27 15:25:13 2007 UTC (17 years, 1 month ago) by niro
    File size: 1360 byte(s) 
    files for 2.6.20-r5
    1 niro 133
    2     From: Con Kolivas <kernel@kolivas.org>
    3    
    4     Add an above_background_load() function which can be used by other
    5     subsystems to detect if there is anything besides niced tasks running.
    6     Place it in sched.h to allow it to be compiled out if not used.
    7    
    8     Signed-off-by: Con Kolivas <kernel@kolivas.org>
    9     Acked-by: Ingo Molnar <mingo@elte.hu>
    10     Cc: Peter Williams <pwil3058@bigpond.net.au>
    11     Signed-off-by: Andrew Morton <akpm@osdl.org>
    12     ---
    13    
    14     include/linux/sched.h | 16 ++++++++++++++++
    15     1 file changed, 16 insertions(+)
    16    
    17     Index: linux-2.6.20-ck1/include/linux/sched.h
    18     ===================================================================
    19     --- linux-2.6.20-ck1.orig/include/linux/sched.h 2007-02-16 19:01:31.000000000 +1100
    20     +++ linux-2.6.20-ck1/include/linux/sched.h 2007-02-16 19:01:33.000000000 +1100
    21     @@ -753,6 +753,22 @@ extern unsigned int max_cache_size;
    22    
    23     #endif /* CONFIG_SMP */
    24    
    25     +/*
    26     + * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
    27     + * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
    28     + * task of nice 0 or enough lower priority tasks to bring up the
    29     + * weighted_cpuload
    30     + */
    31     +static inline int above_background_load(void)
    32     +{
    33     + unsigned long cpu;
    34     +
    35     + for_each_online_cpu(cpu) {
    36     + if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
    37     + return 1;
    38     + }
    39     + return 0;
    40     +}
    41    
    42     struct io_context; /* See blkdev.h */
    43     struct cpuset;