/** * @file cpu_buffer.h * * @remark Copyright 2002-2009 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> * @author Robert Richter <robert.richter@amd.com> */ #ifndef OPROFILE_CPU_BUFFER_H #define OPROFILE_CPU_BUFFER_H #include <linux/types.h> #include <linux/spinlock.h> #include <linux/workqueue.h> #include <linux/cache.h> #include <linux/sched.h> #include <linux/ring_buffer.h> struct task_struct; int alloc_cpu_buffers(void); void free_cpu_buffers(void); void start_cpu_work(void); void end_cpu_work(void); /* CPU buffer is composed of such entries (which are * also used for context switch notes) */ struct op_sample { unsigned long eip; unsigned long event; unsigned long data[0]; }; struct op_entry; struct oprofile_cpu_buffer { unsigned long buffer_size; struct task_struct *last_task; int last_is_kernel; int tracing; unsigned long sample_received; unsigned long sample_lost_overflow; unsigned long backtrace_aborted; unsigned long sample_invalid_eip; int cpu; struct delayed_work work; }; DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer); /* * Resets the cpu buffer to a sane state. * * reset these to invalid values; the next sample collected will * populate the buffer with proper values to initialize the buffer */ static inline void op_cpu_buffer_reset(int cpu) { struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu); cpu_buf->last_is_kernel = -1; cpu_buf->last_task = NULL; } /* * op_cpu_buffer_add_data() and op_cpu_buffer_write_commit() may be * called only if op_cpu_buffer_write_reserve() did not return NULL or * entry->event != NULL, otherwise entry->size or entry->event will be * used uninitialized. */ struct op_sample *op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size); int op_cpu_buffer_write_commit(struct op_entry *entry); struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu); unsigned long op_cpu_buffer_entries(int cpu); /* returns the remaining free size of data in the entry */ static inline int op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val) { if (!entry->size) return 0; *entry->data = val; entry->size--; entry->data++; return entry->size; } /* returns the size of data in the entry */ static inline int op_cpu_buffer_get_size(struct op_entry *entry) { return entry->size; } /* returns 0 if empty or the size of data including the current value */ static inline int op_cpu_buffer_get_data(struct op_entry *entry, unsigned long *val) { int size = entry->size; if (!size) return 0; *val = *entry->data; entry->size--; entry->data++; return size; } /* extra data flags */ #define KERNEL_CTX_SWITCH (1UL << 0) #define IS_KERNEL (1UL << 1) #define TRACE_BEGIN (1UL << 2) #define USER_CTX_SWITCH (1UL << 3) #endif /* OPROFILE_CPU_BUFFER_H */