oprofile: adding cpu_buffer_write_commit()
This is in preparation for changes in the cpu buffer implementation. Signed-off-by: Robert Richter <robert.richter@amd.com>
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@ -148,22 +148,6 @@ static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
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return tail + (b->buffer_size - head) - 1;
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}
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static void increment_head(struct oprofile_cpu_buffer *b)
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{
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unsigned long new_head = b->head_pos + 1;
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/*
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* Ensure anything written to the slot before we increment is
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* visible
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*/
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wmb();
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if (new_head < b->buffer_size)
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b->head_pos = new_head;
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else
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b->head_pos = 0;
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}
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static inline void
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add_sample(struct oprofile_cpu_buffer *cpu_buf,
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unsigned long pc, unsigned long event)
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@ -171,7 +155,7 @@ add_sample(struct oprofile_cpu_buffer *cpu_buf,
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struct op_sample *entry = cpu_buffer_write_entry(cpu_buf);
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entry->eip = pc;
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entry->event = event;
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increment_head(cpu_buf);
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cpu_buffer_write_commit(cpu_buf);
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}
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static inline void
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@ -58,6 +58,23 @@ struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
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return &cpu_buf->buffer[cpu_buf->head_pos];
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}
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static inline
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void cpu_buffer_write_commit(struct oprofile_cpu_buffer *b)
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{
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unsigned long new_head = b->head_pos + 1;
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/*
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* Ensure anything written to the slot before we increment is
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* visible
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*/
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wmb();
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if (new_head < b->buffer_size)
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b->head_pos = new_head;
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else
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b->head_pos = 0;
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}
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static inline
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struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
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{
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