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Subject[tip:sched/domains] sched: Stuff the sched_domain creation in a data-structure
Commit-ID:  eb7a74e6cd936c00749e2921b9e058631d986648
Gitweb: http://git.kernel.org/tip/eb7a74e6cd936c00749e2921b9e058631d986648
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Thu, 7 Apr 2011 14:10:00 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 11 Apr 2011 14:09:26 +0200

sched: Stuff the sched_domain creation in a data-structure

In order to make the topology contruction fully dynamic, remove the
still hard-coded list of possible domains and stick them in a
data-structure.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110407122942.770335383@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/sched.c | 32 ++++++++++++++++++++++++++------
1 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 3ae1e02..f0e1821 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6843,6 +6843,16 @@ enum s_alloc {
sa_none,
};

+typedef struct sched_domain *(*sched_domain_build_f)(struct s_data *d,
+ const struct cpumask *cpu_map, struct sched_domain_attr *attr,
+ struct sched_domain *parent, int cpu);
+
+typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
+
+struct sched_domain_topology_level {
+ sched_domain_build_f build;
+};
+
/*
* Assumes the sched_domain tree is fully constructed
*/
@@ -7185,6 +7195,18 @@ static struct sched_domain *__build_smt_sched_domain(struct s_data *d,
return sd;
}

+static struct sched_domain_topology_level default_topology[] = {
+ { __build_allnodes_sched_domain, },
+ { __build_node_sched_domain, },
+ { __build_cpu_sched_domain, },
+ { __build_book_sched_domain, },
+ { __build_mc_sched_domain, },
+ { __build_smt_sched_domain, },
+ { NULL, },
+};
+
+static struct sched_domain_topology_level *sched_domain_topology = default_topology;
+
/*
* Build sched domains for a given set of cpus and attach the sched domains
* to the individual cpus
@@ -7203,13 +7225,11 @@ static int build_sched_domains(const struct cpumask *cpu_map,

/* Set up domains for cpus specified by the cpu_map. */
for_each_cpu(i, cpu_map) {
+ struct sched_domain_topology_level *tl;
+
sd = NULL;
- sd = __build_allnodes_sched_domain(&d, cpu_map, attr, sd, i);
- sd = __build_node_sched_domain(&d, cpu_map, attr, sd, i);
- sd = __build_cpu_sched_domain(&d, cpu_map, attr, sd, i);
- sd = __build_book_sched_domain(&d, cpu_map, attr, sd, i);
- sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i);
- sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i);
+ for (tl = sched_domain_topology; tl->build; tl++)
+ sd = tl->build(&d, cpu_map, attr, sd, i);

*per_cpu_ptr(d.sd, i) = sd;
}

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