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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1acda878e2
The new ring buffer implementation allows the storage of samples with different size. This patch implements the usage of the new sample format to store ibs samples in the cpu buffer. Until now, writing to the cpu buffer could lead to incomplete sampling sequences since IBS samples were transfered in multiple samples. Due to a full buffer, data could be lost at any time. This can't happen any more since the complete data is reserved in advance and then stored in a single sample. Signed-off-by: Robert Richter <robert.richter@amd.com>
119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
/**
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* @file cpu_buffer.h
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*
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* @remark Copyright 2002-2009 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon <levon@movementarian.org>
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* @author Robert Richter <robert.richter@amd.com>
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*/
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#ifndef OPROFILE_CPU_BUFFER_H
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#define OPROFILE_CPU_BUFFER_H
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/cache.h>
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#include <linux/sched.h>
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#include <linux/ring_buffer.h>
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struct task_struct;
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int alloc_cpu_buffers(void);
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void free_cpu_buffers(void);
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void start_cpu_work(void);
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void end_cpu_work(void);
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/* CPU buffer is composed of such entries (which are
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* also used for context switch notes)
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*/
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struct op_sample {
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unsigned long eip;
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unsigned long event;
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unsigned long data[0];
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};
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struct op_entry {
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struct ring_buffer_event *event;
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struct op_sample *sample;
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unsigned long irq_flags;
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unsigned long size;
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unsigned long *data;
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};
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struct oprofile_cpu_buffer {
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unsigned long buffer_size;
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struct task_struct *last_task;
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int last_is_kernel;
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int tracing;
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unsigned long sample_received;
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unsigned long sample_lost_overflow;
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unsigned long backtrace_aborted;
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unsigned long sample_invalid_eip;
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int cpu;
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struct delayed_work work;
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};
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DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
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/*
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* Resets the cpu buffer to a sane state.
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*
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* reset these to invalid values; the next sample collected will
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* populate the buffer with proper values to initialize the buffer
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*/
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static inline void op_cpu_buffer_reset(int cpu)
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{
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struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
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cpu_buf->last_is_kernel = -1;
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cpu_buf->last_task = NULL;
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}
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struct op_sample
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*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);
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int op_cpu_buffer_write_commit(struct op_entry *entry);
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struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu);
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unsigned long op_cpu_buffer_entries(int cpu);
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/* returns the remaining free size of data in the entry */
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static inline
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int op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val)
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{
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if (!entry->size)
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return 0;
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*entry->data = val;
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entry->size--;
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entry->data++;
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return entry->size;
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}
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/* returns the size of data in the entry */
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static inline
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int op_cpu_buffer_get_size(struct op_entry *entry)
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{
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return entry->size;
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}
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/* returns 0 if empty or the size of data including the current value */
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static inline
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int op_cpu_buffer_get_data(struct op_entry *entry, unsigned long *val)
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{
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int size = entry->size;
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if (!size)
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return 0;
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*val = *entry->data;
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entry->size--;
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entry->data++;
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return size;
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}
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/* extra data flags */
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#define KERNEL_CTX_SWITCH (1UL << 0)
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#define IS_KERNEL (1UL << 1)
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#define TRACE_BEGIN (1UL << 2)
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#define USER_CTX_SWITCH (1UL << 3)
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#endif /* OPROFILE_CPU_BUFFER_H */
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