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Date: Mon, 20 Jan 2014 12:39:41 +0000
From: dietmar.eggemann@....com
To: peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org,
morten.rasmussen@....com, chris.redpath@....com
Cc: linux-kernel@...r.kernel.org, dietmar.eggemann@....com
Subject: [RFC v2 PATCH 04/11] sched: replace SD_INIT_FUNC with sd_init()
From: Dietmar Eggemann <dietmar.eggemann@....com>
This patch incorporates struct sched_domain_topology_info info into struct
sched_domain_topology_level. It updates sd_init_numa() to reflect the
change that conventional (SMT, MC, BOOK, CPU) level initialization relies
on the topology_info[] array and not on the default_topology[] any more.
Moreover a counterpart function sched_init_conv() is introduced to handle
the allocation of the topology array for a !CONFIG_NUMA system.
The patch deletes the default topology array default_topology[] and the
SD_INIT_FUNC() macro which are not used any more. The function
sd_local_flags() is deleted too and the appropriate functionality is
directly incorporated into the NUMA specific condition path in sd_init().
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
---
kernel/sched/core.c | 247 ++++++++++++++++++++++++++++-----------------------
1 file changed, 135 insertions(+), 112 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 523bb43756d6..90aa7c3d3a00 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5006,15 +5006,10 @@ enum s_alloc {
sa_none,
};
-struct sched_domain_topology_level;
-
-typedef struct sched_domain *(*sched_domain_init_f)(struct sched_domain_topology_level *tl, int cpu);
-
#define SDTL_OVERLAP 0x01
struct sched_domain_topology_level {
- sched_domain_init_f init;
- sched_domain_mask_f mask;
+ struct sched_domain_topology_info info;
int flags;
int numa_level;
struct sd_data data;
@@ -5254,28 +5249,6 @@ int __weak arch_sd_sibling_asym_packing(void)
# define SD_INIT_NAME(sd, type) do { } while (0)
#endif
-#define SD_INIT_FUNC(type) \
-static noinline struct sched_domain * \
-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_INIT_NAME(sd, type); \
- sd->private = &tl->data; \
- return sd; \
-}
-
-SD_INIT_FUNC(CPU)
-#ifdef CONFIG_SCHED_SMT
- SD_INIT_FUNC(SIBLING)
-#endif
-#ifdef CONFIG_SCHED_MC
- SD_INIT_FUNC(MC)
-#endif
-#ifdef CONFIG_SCHED_BOOK
- SD_INIT_FUNC(BOOK)
-#endif
-
static int default_relax_domain_level = -1;
int sched_domain_level_max;
@@ -5364,23 +5337,6 @@ static void claim_allocations(int cpu, struct sched_domain *sd)
}
/*
- * Topology list, bottom-up.
- */
-static struct sched_domain_topology_level default_topology[] = {
-#ifdef CONFIG_SCHED_SMT
- { sd_init_SIBLING, cpu_smt_mask, },
-#endif
-#ifdef CONFIG_SCHED_MC
- { sd_init_MC, cpu_coregroup_mask, },
-#endif
-#ifdef CONFIG_SCHED_BOOK
- { sd_init_BOOK, cpu_book_mask, },
-#endif
- { sd_init_CPU, cpu_cpu_mask, },
- { NULL, },
-};
-
-/*
* Topology info list, bottom-up.
*/
static struct sched_domain_topology_info default_topology_info[] = {
@@ -5394,10 +5350,9 @@ static struct sched_domain_topology_info default_topology_info[] = {
{ cpu_book_mask, },
#endif
{ cpu_cpu_mask, },
- { NULL, },
};
-static struct sched_domain_topology_level *sched_domain_topology = default_topology;
+static struct sched_domain_topology_level *sched_domain_topology;
static struct sched_domain_topology_info *sched_domain_topology_info =
default_topology_info;
static unsigned int sched_domain_topology_info_size =
@@ -5411,7 +5366,7 @@ set_sd_topology_info(struct sched_domain_topology_info *ti, unsigned int s)
}
#define for_each_sd_topology(tl) \
- for (tl = sched_domain_topology; tl->init; tl++)
+ for (tl = sched_domain_topology; tl->info.mask; tl++)
#ifdef CONFIG_NUMA
@@ -5420,61 +5375,6 @@ static int *sched_domains_numa_distance;
static struct cpumask ***sched_domains_numa_masks;
static int sched_domains_curr_level;
-static inline int sd_local_flags(int level)
-{
- if (sched_domains_numa_distance[level] > RECLAIM_DISTANCE)
- return 0;
-
- return SD_BALANCE_EXEC | SD_BALANCE_FORK | SD_WAKE_AFFINE;
-}
-
-static struct sched_domain *
-sd_numa_init(struct sched_domain_topology_level *tl, int cpu)
-{
- struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu);
- int level = tl->numa_level;
- int sd_weight = cpumask_weight(
- sched_domains_numa_masks[level][cpu_to_node(cpu)]);
-
- *sd = (struct sched_domain){
- .min_interval = sd_weight,
- .max_interval = 2*sd_weight,
- .busy_factor = 32,
- .imbalance_pct = 125,
- .cache_nice_tries = 2,
- .busy_idx = 3,
- .idle_idx = 2,
- .newidle_idx = 0,
- .wake_idx = 0,
- .forkexec_idx = 0,
-
- .flags = 1*SD_LOAD_BALANCE
- | 1*SD_BALANCE_NEWIDLE
- | 0*SD_BALANCE_EXEC
- | 0*SD_BALANCE_FORK
- | 0*SD_BALANCE_WAKE
- | 0*SD_WAKE_AFFINE
- | 0*SD_SHARE_CPUPOWER
- | 0*SD_SHARE_PKG_RESOURCES
- | 1*SD_SERIALIZE
- | 0*SD_PREFER_SIBLING
- | 1*SD_NUMA
- | sd_local_flags(level)
- ,
- .last_balance = jiffies,
- .balance_interval = sd_weight,
- };
- SD_INIT_NAME(sd, NUMA);
- sd->private = &tl->data;
-
- /*
- * Ugly hack to pass state to sd_numa_mask()...
- */
- sched_domains_curr_level = tl->numa_level;
-
- return sd;
-}
-
static const struct cpumask *sd_numa_mask(int cpu)
{
return sched_domains_numa_masks[sched_domains_curr_level][cpu_to_node(cpu)];
@@ -5520,6 +5420,7 @@ static void sched_init_numa(void)
{
int next_distance, curr_distance = node_distance(0, 0);
struct sched_domain_topology_level *tl;
+ struct sched_domain_topology_info *ti = sched_domain_topology_info;
int level = 0;
int i, j, k;
@@ -5618,24 +5519,29 @@ static void sched_init_numa(void)
}
}
- tl = kzalloc((ARRAY_SIZE(default_topology) + level) *
- sizeof(struct sched_domain_topology_level), GFP_KERNEL);
+ /*
+ * An extra empty struct sched_domain_topology_level element at the end
+ * of the array is needed to let for_each_sd_topology() work correctly.
+ */
+ tl = kzalloc((sched_domain_topology_info_size + level + 1) *
+ sizeof(struct sched_domain_topology_level),
+ GFP_KERNEL);
if (!tl)
return;
/*
- * Copy the default topology bits..
+ * Copy the topology info bits..
*/
- for (i = 0; default_topology[i].init; i++)
- tl[i] = default_topology[i];
+ for (i = 0; i < sched_domain_topology_info_size; i++)
+ tl[i].info = ti[i];
/*
* .. and append 'j' levels of NUMA goodness.
*/
for (j = 0; j < level; i++, j++) {
tl[i] = (struct sched_domain_topology_level){
- .init = sd_numa_init,
- .mask = sd_numa_mask,
+ .info.mask = sd_numa_mask,
+ .info.flags = SD_NUMA,
.flags = SDTL_OVERLAP,
.numa_level = j,
};
@@ -5646,6 +5552,10 @@ static void sched_init_numa(void)
sched_domains_numa_levels = level;
}
+static void sched_init_conv(void)
+{
+}
+
static void sched_domains_numa_masks_set(int cpu)
{
int i, j;
@@ -5698,6 +5608,31 @@ static inline void sched_init_numa(void)
{
}
+static void sched_init_conv(void)
+{
+ struct sched_domain_topology_level *tl;
+ struct sched_domain_topology_info *ti = sched_domain_topology_info;
+ int i;
+
+ /*
+ * An extra empty struct sched_domain_topology_level element at the end
+ * of the array is needed to let for_each_sd_topology() work correctly.
+ */
+ tl = kzalloc((sched_domain_topology_info_size + 1) *
+ sizeof(struct sched_domain_topology_level),
+ GFP_KERNEL);
+ if (!tl)
+ return;
+
+ /*
+ * Copy the topology info bits..
+ */
+ for (i = 0; i < sched_domain_topology_info_size; i++)
+ tl[i].info = ti[i];
+
+ sched_domain_topology = tl;
+}
+
static int sched_domains_numa_masks_update(struct notifier_block *nfb,
unsigned long action,
void *hcpu)
@@ -5706,6 +5641,93 @@ static int sched_domains_numa_masks_update(struct notifier_block *nfb,
}
#endif /* CONFIG_NUMA */
+static struct sched_domain *
+sd_init(struct sched_domain_topology_level *tl, int cpu)
+{
+ struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu);
+ int sd_weight;
+
+#ifdef CONFIG_NUMA
+ /*
+ * Ugly hack to pass state to sd_numa_mask()...
+ */
+ sched_domains_curr_level = tl->numa_level;
+#endif
+
+ sd_weight = cpumask_weight(tl->info.mask(cpu));
+
+ if (WARN_ONCE(tl->info.flags & ~TOPOLOGY_SD_FLAGS,
+ "wrong flags in topology info\n"))
+ tl->info.flags &= ~TOPOLOGY_SD_FLAGS;
+
+ *sd = (struct sched_domain){
+ .min_interval = sd_weight,
+ .max_interval = 2*sd_weight,
+ .busy_factor = 64,
+ .imbalance_pct = 125,
+
+ .flags = 1*SD_LOAD_BALANCE
+ | 1*SD_BALANCE_NEWIDLE
+ | 1*SD_BALANCE_EXEC
+ | 1*SD_BALANCE_FORK
+ | 1*SD_WAKE_AFFINE
+ | tl->info.flags
+ ,
+
+ .last_balance = jiffies,
+ .balance_interval = sd_weight,
+ };
+
+ /*
+ * Convert topological properties into behaviour.
+ */
+
+ if (sd->flags & SD_SHARE_CPUPOWER) {
+ sd->imbalance_pct = 110;
+ sd->smt_gain = 1178; /* ~15% */
+
+ /*
+ * Call SMT specific arch topology function.
+ * This goes away once the powerpc arch uses
+ * the new interface for scheduler domain
+ * setup.
+ */
+ sd->flags |= arch_sd_sibling_asym_packing();
+
+ SD_INIT_NAME(sd, SMT);
+ } else if (sd->flags & SD_SHARE_PKG_RESOURCES) {
+ sd->cache_nice_tries = 1;
+ sd->busy_idx = 2;
+
+ SD_INIT_NAME(sd, MC);
+#ifdef CONFIG_NUMA
+ } else if (sd->flags & SD_NUMA) {
+ sd->busy_factor = 32,
+ sd->cache_nice_tries = 2;
+ sd->busy_idx = 3;
+ sd->idle_idx = 2;
+ sd->flags |= SD_SERIALIZE;
+ if (sched_domains_numa_distance[tl->numa_level]
+ > RECLAIM_DISTANCE) {
+ sd->flags &= ~(SD_BALANCE_EXEC |
+ SD_BALANCE_FORK |
+ SD_WAKE_AFFINE);
+ }
+#endif
+ } else {
+ sd->cache_nice_tries = 1;
+ sd->busy_idx = 2;
+ sd->idle_idx = 1;
+ sd->flags |= SD_PREFER_SIBLING;
+
+ SD_INIT_NAME(sd, CPU);
+ }
+
+ sd->private = &tl->data;
+
+ return sd;
+}
+
static int __sdt_alloc(const struct cpumask *cpu_map)
{
struct sched_domain_topology_level *tl;
@@ -5795,11 +5817,11 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
const struct cpumask *cpu_map, struct sched_domain_attr *attr,
struct sched_domain *child, int cpu)
{
- struct sched_domain *sd = tl->init(tl, cpu);
+ struct sched_domain *sd = sd_init(tl, cpu);
if (!sd)
return child;
- cpumask_and(sched_domain_span(sd), cpu_map, tl->mask(cpu));
+ cpumask_and(sched_domain_span(sd), cpu_map, tl->info.mask(cpu));
if (child) {
sd->level = child->level + 1;
sched_domain_level_max = max(sched_domain_level_max, sd->level);
@@ -6138,6 +6160,7 @@ void __init sched_init_smp(void)
alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL);
alloc_cpumask_var(&fallback_doms, GFP_KERNEL);
+ sched_init_conv();
sched_init_numa();
/*
--
1.7.9.5
--
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