diff options
author | Mike Travis <travis@sgi.com> | 2008-04-05 01:11:11 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-04-19 17:44:59 (GMT) |
commit | 7c16ec585c558960a508ccf9a08fcb9ed49b3754 (patch) | |
tree | cca2b12203a10944d7095a07df7292421f578dc9 /include/linux/topology.h | |
parent | c5f59f0833df945eef7ff35f3dc6ba61c5f293dd (diff) | |
download | linux-fsl-qoriq-7c16ec585c558960a508ccf9a08fcb9ed49b3754.tar.xz |
cpumask: reduce stack usage in SD_x_INIT initializers
* Remove empty cpumask_t (and all non-zero/non-null) variables
in SD_*_INIT macros. Use memset(0) to clear. Also, don't
inline the initializer functions to save on stack space in
build_sched_domains().
* Merge change to include/linux/topology.h that uses the new
node_to_cpumask_ptr function in the nr_cpus_node macro into
this patch.
Depends on:
[mm-patch]: asm-generic-add-node_to_cpumask_ptr-macro.patch
[sched-devel]: sched: add new set_cpus_allowed_ptr function
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/topology.h')
-rw-r--r-- | include/linux/topology.h | 46 |
1 files changed, 8 insertions, 38 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h index bd14f8b..4bb7074 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -38,16 +38,15 @@ #endif #ifndef nr_cpus_node -#define nr_cpus_node(node) \ - ({ \ - cpumask_t __tmp__; \ - __tmp__ = node_to_cpumask(node); \ - cpus_weight(__tmp__); \ +#define nr_cpus_node(node) \ + ({ \ + node_to_cpumask_ptr(__tmp__, node); \ + cpus_weight(*__tmp__); \ }) #endif -#define for_each_node_with_cpus(node) \ - for_each_online_node(node) \ +#define for_each_node_with_cpus(node) \ + for_each_online_node(node) \ if (nr_cpus_node(node)) void arch_update_cpu_topology(void); @@ -80,7 +79,9 @@ void arch_update_cpu_topology(void); * by defining their own arch-specific initializer in include/asm/topology.h. * A definition there will automagically override these default initializers * and allow arch-specific performance tuning of sched_domains. + * (Only non-zero and non-null fields need be specified.) */ + #ifdef CONFIG_SCHED_SMT /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is, * so can't we drop this in favor of CONFIG_SCHED_SMT? @@ -89,20 +90,10 @@ void arch_update_cpu_topology(void); /* Common values for SMT siblings */ #ifndef SD_SIBLING_INIT #define SD_SIBLING_INIT (struct sched_domain) { \ - .span = CPU_MASK_NONE, \ - .parent = NULL, \ - .child = NULL, \ - .groups = NULL, \ .min_interval = 1, \ .max_interval = 2, \ .busy_factor = 64, \ .imbalance_pct = 110, \ - .cache_nice_tries = 0, \ - .busy_idx = 0, \ - .idle_idx = 0, \ - .newidle_idx = 0, \ - .wake_idx = 0, \ - .forkexec_idx = 0, \ .flags = SD_LOAD_BALANCE \ | SD_BALANCE_NEWIDLE \ | SD_BALANCE_FORK \ @@ -112,7 +103,6 @@ void arch_update_cpu_topology(void); | SD_SHARE_CPUPOWER, \ .last_balance = jiffies, \ .balance_interval = 1, \ - .nr_balance_failed = 0, \ } #endif #endif /* CONFIG_SCHED_SMT */ @@ -121,18 +111,12 @@ void arch_update_cpu_topology(void); /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */ #ifndef SD_MC_INIT #define SD_MC_INIT (struct sched_domain) { \ - .span = CPU_MASK_NONE, \ - .parent = NULL, \ - .child = NULL, \ - .groups = NULL, \ .min_interval = 1, \ .max_interval = 4, \ .busy_factor = 64, \ .imbalance_pct = 125, \ .cache_nice_tries = 1, \ .busy_idx = 2, \ - .idle_idx = 0, \ - .newidle_idx = 0, \ .wake_idx = 1, \ .forkexec_idx = 1, \ .flags = SD_LOAD_BALANCE \ @@ -144,7 +128,6 @@ void arch_update_cpu_topology(void); | BALANCE_FOR_MC_POWER, \ .last_balance = jiffies, \ .balance_interval = 1, \ - .nr_balance_failed = 0, \ } #endif #endif /* CONFIG_SCHED_MC */ @@ -152,10 +135,6 @@ void arch_update_cpu_topology(void); /* Common values for CPUs */ #ifndef SD_CPU_INIT #define SD_CPU_INIT (struct sched_domain) { \ - .span = CPU_MASK_NONE, \ - .parent = NULL, \ - .child = NULL, \ - .groups = NULL, \ .min_interval = 1, \ .max_interval = 4, \ .busy_factor = 64, \ @@ -174,16 +153,11 @@ void arch_update_cpu_topology(void); | BALANCE_FOR_PKG_POWER,\ .last_balance = jiffies, \ .balance_interval = 1, \ - .nr_balance_failed = 0, \ } #endif /* sched_domains SD_ALLNODES_INIT for NUMA machines */ #define SD_ALLNODES_INIT (struct sched_domain) { \ - .span = CPU_MASK_NONE, \ - .parent = NULL, \ - .child = NULL, \ - .groups = NULL, \ .min_interval = 64, \ .max_interval = 64*num_online_cpus(), \ .busy_factor = 128, \ @@ -191,14 +165,10 @@ void arch_update_cpu_topology(void); .cache_nice_tries = 1, \ .busy_idx = 3, \ .idle_idx = 3, \ - .newidle_idx = 0, /* unused */ \ - .wake_idx = 0, /* unused */ \ - .forkexec_idx = 0, /* unused */ \ .flags = SD_LOAD_BALANCE \ | SD_SERIALIZE, \ .last_balance = jiffies, \ .balance_interval = 64, \ - .nr_balance_failed = 0, \ } #ifdef CONFIG_NUMA |