diff options
| author | Morten Rasmussen <Morten.Rasmussen@arm.com> | 2012-09-14 14:38:09 +0100 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2013-01-04 12:25:46 +0530 |
| commit | c186c0cce8a8f069d78fdcb06b4a5f4c148da50f (patch) | |
| tree | 9d7fb1a2aef0a9d45c7918ff8d5c57abdc7e5c9c /include | |
| parent | c9f7f57b2820cf1eba1aec29dbcad32a3f24dc96 (diff) | |
sched: Task placement for heterogeneous systems based on task load-tracking
This patch introduces the basic SCHED_HMP infrastructure. Each class of
cpus is represented by a hmp_domain and tasks will only be moved between
these domains when their load profiles suggest it is beneficial.
SCHED_HMP relies heavily on the task load-tracking introduced in Paul
Turners fair group scheduling patch set:
<https://lkml.org/lkml/2012/8/23/267>
SCHED_HMP requires that the platform implements arch_get_hmp_domains()
which should set up the platform specific list of hmp_domains. It is
also assumed that the platform disables SD_LOAD_BALANCE for the
appropriate sched_domains.
Tasks placement takes place every time a task is to be inserted into
a runqueue based on its load history. The task placement decision is
based on load thresholds.
There are no restrictions on the number of hmp_domains, however,
multiple (>2) has not been tested and the up/down migration policy is
rather simple.
Signed-off-by: Morten Rasmussen <Morten.Rasmussen@arm.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index abf222e5dce..faf4ef7e3ca 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1020,6 +1020,12 @@ unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); bool cpus_share_cache(int this_cpu, int that_cpu); +#ifdef CONFIG_SCHED_HMP +struct hmp_domain { + struct cpumask cpus; + struct list_head hmp_domains; +}; +#endif /* CONFIG_SCHED_HMP */ #else /* CONFIG_SMP */ struct sched_domain_attr; |