From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/include/linux/cpuset.h | 242 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 242 insertions(+) create mode 100644 kernel/include/linux/cpuset.h (limited to 'kernel/include/linux/cpuset.h') diff --git a/kernel/include/linux/cpuset.h b/kernel/include/linux/cpuset.h new file mode 100644 index 000000000..1b357997c --- /dev/null +++ b/kernel/include/linux/cpuset.h @@ -0,0 +1,242 @@ +#ifndef _LINUX_CPUSET_H +#define _LINUX_CPUSET_H +/* + * cpuset interface + * + * Copyright (C) 2003 BULL SA + * Copyright (C) 2004-2006 Silicon Graphics, Inc. + * + */ + +#include +#include +#include +#include +#include + +#ifdef CONFIG_CPUSETS + +extern struct static_key cpusets_enabled_key; +static inline bool cpusets_enabled(void) +{ + return static_key_false(&cpusets_enabled_key); +} + +static inline int nr_cpusets(void) +{ + /* jump label reference count + the top-level cpuset */ + return static_key_count(&cpusets_enabled_key) + 1; +} + +static inline void cpuset_inc(void) +{ + static_key_slow_inc(&cpusets_enabled_key); +} + +static inline void cpuset_dec(void) +{ + static_key_slow_dec(&cpusets_enabled_key); +} + +extern int cpuset_init(void); +extern void cpuset_init_smp(void); +extern void cpuset_update_active_cpus(bool cpu_online); +extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); +extern void cpuset_cpus_allowed_fallback(struct task_struct *p); +extern nodemask_t cpuset_mems_allowed(struct task_struct *p); +#define cpuset_current_mems_allowed (current->mems_allowed) +void cpuset_init_current_mems_allowed(void); +int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); + +extern int __cpuset_node_allowed(int node, gfp_t gfp_mask); + +static inline int cpuset_node_allowed(int node, gfp_t gfp_mask) +{ + return nr_cpusets() <= 1 || __cpuset_node_allowed(node, gfp_mask); +} + +static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) +{ + return cpuset_node_allowed(zone_to_nid(z), gfp_mask); +} + +extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, + const struct task_struct *tsk2); + +#define cpuset_memory_pressure_bump() \ + do { \ + if (cpuset_memory_pressure_enabled) \ + __cpuset_memory_pressure_bump(); \ + } while (0) +extern int cpuset_memory_pressure_enabled; +extern void __cpuset_memory_pressure_bump(void); + +extern void cpuset_task_status_allowed(struct seq_file *m, + struct task_struct *task); +extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *tsk); + +extern int cpuset_mem_spread_node(void); +extern int cpuset_slab_spread_node(void); + +static inline int cpuset_do_page_mem_spread(void) +{ + return task_spread_page(current); +} + +static inline int cpuset_do_slab_mem_spread(void) +{ + return task_spread_slab(current); +} + +extern int current_cpuset_is_being_rebound(void); + +extern void rebuild_sched_domains(void); + +extern void cpuset_print_task_mems_allowed(struct task_struct *p); + +/* + * read_mems_allowed_begin is required when making decisions involving + * mems_allowed such as during page allocation. mems_allowed can be updated in + * parallel and depending on the new value an operation can fail potentially + * causing process failure. A retry loop with read_mems_allowed_begin and + * read_mems_allowed_retry prevents these artificial failures. + */ +static inline unsigned int read_mems_allowed_begin(void) +{ + return read_seqcount_begin(¤t->mems_allowed_seq); +} + +/* + * If this returns true, the operation that took place after + * read_mems_allowed_begin may have failed artificially due to a concurrent + * update of mems_allowed. It is up to the caller to retry the operation if + * appropriate. + */ +static inline bool read_mems_allowed_retry(unsigned int seq) +{ + return read_seqcount_retry(¤t->mems_allowed_seq, seq); +} + +static inline void set_mems_allowed(nodemask_t nodemask) +{ + unsigned long flags; + + task_lock(current); + local_irq_save(flags); + write_seqcount_begin(¤t->mems_allowed_seq); + current->mems_allowed = nodemask; + write_seqcount_end(¤t->mems_allowed_seq); + local_irq_restore(flags); + task_unlock(current); +} + +#else /* !CONFIG_CPUSETS */ + +static inline bool cpusets_enabled(void) { return false; } + +static inline int cpuset_init(void) { return 0; } +static inline void cpuset_init_smp(void) {} + +static inline void cpuset_update_active_cpus(bool cpu_online) +{ + partition_sched_domains(1, NULL, NULL); +} + +static inline void cpuset_cpus_allowed(struct task_struct *p, + struct cpumask *mask) +{ + cpumask_copy(mask, cpu_possible_mask); +} + +static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) +{ +} + +static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) +{ + return node_possible_map; +} + +#define cpuset_current_mems_allowed (node_states[N_MEMORY]) +static inline void cpuset_init_current_mems_allowed(void) {} + +static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) +{ + return 1; +} + +static inline int cpuset_node_allowed(int node, gfp_t gfp_mask) +{ + return 1; +} + +static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) +{ + return 1; +} + +static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, + const struct task_struct *tsk2) +{ + return 1; +} + +static inline void cpuset_memory_pressure_bump(void) {} + +static inline void cpuset_task_status_allowed(struct seq_file *m, + struct task_struct *task) +{ +} + +static inline int cpuset_mem_spread_node(void) +{ + return 0; +} + +static inline int cpuset_slab_spread_node(void) +{ + return 0; +} + +static inline int cpuset_do_page_mem_spread(void) +{ + return 0; +} + +static inline int cpuset_do_slab_mem_spread(void) +{ + return 0; +} + +static inline int current_cpuset_is_being_rebound(void) +{ + return 0; +} + +static inline void rebuild_sched_domains(void) +{ + partition_sched_domains(1, NULL, NULL); +} + +static inline void cpuset_print_task_mems_allowed(struct task_struct *p) +{ +} + +static inline void set_mems_allowed(nodemask_t nodemask) +{ +} + +static inline unsigned int read_mems_allowed_begin(void) +{ + return 0; +} + +static inline bool read_mems_allowed_retry(unsigned int seq) +{ + return false; +} + +#endif /* !CONFIG_CPUSETS */ + +#endif /* _LINUX_CPUSET_H */ -- cgit 1.2.3-korg