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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-04-09 15:07:54 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-04-15 10:41:44 +0200 |
| commit | c5831a3f9af11228dbdaabaf01f69d37e55684ef (patch) | |
| tree | e9ddedd942f3f31d239820dfc4dbcef4cde0b09a /c/src/lib/libbsp/i386/shared/smp/smp-imps.c | |
| parent | rtems: Add task get/set scheduler (diff) | |
| download | rtems-c5831a3f9af11228dbdaabaf01f69d37e55684ef.tar.bz2 | |
score: Add clustered/partitioned scheduling
Clustered/partitioned scheduling helps to control the worst-case
latencies in the system. The goal is to reduce the amount of shared
state in the system and thus prevention of lock contention. Modern
multi-processor systems tend to have several layers of data and
instruction caches. With clustered/partitioned scheduling it is
possible to honour the cache topology of a system and thus avoid
expensive cache synchronization traffic.
We have clustered scheduling in case the set of processors of a system
is partitioned into non-empty pairwise-disjoint subsets. These subsets
are called clusters. Clusters with a cardinality of one are partitions.
Each cluster is owned by exactly one scheduler instance.
Diffstat (limited to 'c/src/lib/libbsp/i386/shared/smp/smp-imps.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/shared/smp/smp-imps.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/c/src/lib/libbsp/i386/shared/smp/smp-imps.c b/c/src/lib/libbsp/i386/shared/smp/smp-imps.c index 19b23e2631..fdbf915881 100644 --- a/c/src/lib/libbsp/i386/shared/smp/smp-imps.c +++ b/c/src/lib/libbsp/i386/shared/smp/smp-imps.c @@ -57,6 +57,7 @@ #include <bsp/smp-imps.h> #include <bsp/irq.h> #include <rtems/score/smpimpl.h> +#include <rtems/score/schedulerimpl.h> /* * XXXXX The following absolutely must be defined!!! @@ -386,7 +387,12 @@ imps_read_config_table(unsigned start, int count) switch (*((unsigned char *)start)) { case IMPS_BCT_PROCESSOR: if ( imps_num_cpus < rtems_configuration_get_maximum_processors() ) { - add_processor((imps_processor *)start); + const Scheduler_Assignment *assignment = + _Scheduler_Get_assignment((uint32_t) imps_num_cpus); + + if (_Scheduler_Should_start_processor(assignment)) { + add_processor((imps_processor *)start); + } } else imps_num_cpus++; start += 12; /* 20 total */ |