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Commit 229234ae authored by Robert Richter's avatar Robert Richter
Browse files

oprofile: adding cpu_buffer_write_commit() 



This is in preparation for changes in the cpu buffer implementation.

Signed-off-by: default avatarRobert Richter <robert.richter@amd.com>
parent 7d468abe

drivers/oprofile/cpu_buffer.c

+1 −17
Original line number Diff line number Diff line
@@ -148,22 +148,6 @@ static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b) 
	return tail + (b->buffer_size - head) - 1;

}



static void increment_head(struct oprofile_cpu_buffer *b)

{

	unsigned long new_head = b->head_pos + 1;



	/*

	 * Ensure anything written to the slot before we increment is

	 * visible

	 */

	wmb();



	if (new_head < b->buffer_size)

		b->head_pos = new_head;

	else

		b->head_pos = 0;

}



static inline void

add_sample(struct oprofile_cpu_buffer *cpu_buf,

	   unsigned long pc, unsigned long event)
@@ -171,7 +155,7 @@ add_sample(struct oprofile_cpu_buffer *cpu_buf, 
	struct op_sample *entry = cpu_buffer_write_entry(cpu_buf);

	entry->eip = pc;

	entry->event = event;

	increment_head(cpu_buf);

	cpu_buffer_write_commit(cpu_buf);

}



static inline void

drivers/oprofile/cpu_buffer.h

+17 −0
Original line number Diff line number Diff line
@@ -58,6 +58,23 @@ struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf) 
	return &cpu_buf->buffer[cpu_buf->head_pos];

}



static inline

void cpu_buffer_write_commit(struct oprofile_cpu_buffer *b)

{

	unsigned long new_head = b->head_pos + 1;



	/*

	 * Ensure anything written to the slot before we increment is

	 * visible

	 */

	wmb();



	if (new_head < b->buffer_size)

		b->head_pos = new_head;

	else

		b->head_pos = 0;

}



static inline

struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)

{