sched: Dynamic sched_domain::level

Remove the SD_LV_ enum and use dynamic level assignments.

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/20110407122942.969433965@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 09d9e02..e43e5b0 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -892,25 +892,6 @@ static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
        return to_cpumask(sg->cpumask);
 }
 
-enum sched_domain_level {
-       SD_LV_NONE = 0,
-#ifdef CONFIG_SCHED_SMT
-       SD_LV_SIBLING,
-#endif
-#ifdef CONFIG_SCHED_MC
-       SD_LV_MC,
-#endif
-#ifdef CONFIG_SCHED_BOOK
-       SD_LV_BOOK,
-#endif
-       SD_LV_CPU,
-#ifdef CONFIG_NUMA
-       SD_LV_NODE,
-       SD_LV_ALLNODES,
-#endif
-       SD_LV_MAX
-};
-
 struct sched_domain_attr {
        int relax_domain_level;
 };
@@ -919,6 +900,8 @@ struct sched_domain_attr {
        .relax_domain_level = -1,                       \
 }
 
+extern int sched_domain_level_max;
+
 struct sched_domain {
        /* These fields must be setup */
        struct sched_domain *parent;    /* top domain must be null terminated */
@@ -936,7 +919,7 @@ struct sched_domain {
        unsigned int forkexec_idx;
        unsigned int smt_gain;
        int flags;                      /* See SD_* */
-       enum sched_domain_level level;
+       int level;
 
        /* Runtime fields. */
        unsigned long last_balance;     /* init to jiffies. units in jiffies */

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 33eee16..2bb8c2e 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1159,7 +1159,7 @@ int current_cpuset_is_being_rebound(void)
 static int update_relax_domain_level(struct cpuset *cs, s64 val)
 {
 #ifdef CONFIG_SMP
-       if (val < -1 || val >= SD_LV_MAX)
+       if (val < -1 || val >= sched_domain_level_max)
                return -EINVAL;
 #endif
 

diff --git a/kernel/sched.c b/kernel/sched.c
index 3231e19..506cb81 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6966,7 +6966,6 @@ sd_init_##type(struct sched_domain_topology_level *tl, int cpu)   \
 {                                                                      \
        struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu);       \
        *sd = SD_##type##_INIT;                                         \
-       sd->level = SD_LV_##type;                                       \
        SD_INIT_NAME(sd, type);                                         \
        sd->private = &tl->data;                                        \
        return sd;                                                      \
@@ -6988,13 +6987,14 @@ SD_INIT_FUNC(CPU)
 #endif
 
 static int default_relax_domain_level = -1;
+int sched_domain_level_max;
 
 static int __init setup_relax_domain_level(char *str)
 {
        unsigned long val;
 
        val = simple_strtoul(str, NULL, 0);
-       if (val < SD_LV_MAX)
+       if (val < sched_domain_level_max)
                default_relax_domain_level = val;
 
        return 1;
@@ -7173,8 +7173,11 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
 
        set_domain_attribute(sd, attr);
        cpumask_and(sched_domain_span(sd), cpu_map, tl->mask(cpu));
-       if (child)
+       if (child) {
+               sd->level = child->level + 1;
+               sched_domain_level_max = max(sched_domain_level_max, sd->level);
                child->parent = sd;
+       }
        sd->child = child;
 
        return sd;