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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/cpuset.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
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 <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> 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 <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/linux/cpuset.h')
-rw-r--r--kernel/include/linux/cpuset.h242
1 files changed, 242 insertions, 0 deletions
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 <linux/sched.h>
+#include <linux/cpumask.h>
+#include <linux/nodemask.h>
+#include <linux/mm.h>
+#include <linux/jump_label.h>
+
+#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(&current->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(&current->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(&current->mems_allowed_seq);
+ current->mems_allowed = nodemask;
+ write_seqcount_end(&current->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 */