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Commit bd7dc46f authored by Robert Richter's avatar Robert Richter
Browse files

oprofile: add op_cpu_buffer_get_data() 



This function provides access to attached data of a sample. It returns
the size of data including the current value. Also,
op_cpu_buffer_get_size() is available to check if there is data
attached.

Signed-off-by: default avatarRobert Richter <robert.richter@amd.com>
parent d9928c25

drivers/oprofile/buffer_sync.c

+4 −2
Original line number Diff line number Diff line
@@ -524,6 +524,7 @@ void sync_buffer(int cpu) 
{

	struct mm_struct *mm = NULL;

	struct mm_struct *oldmm;

	unsigned long val;

	struct task_struct *new;

	unsigned long cookie = 0;

	int in_kernel = 1;
@@ -559,10 +560,11 @@ void sync_buffer(int cpu) 
					state = sb_sample_start;

				add_kernel_ctx_switch(flags & IS_KERNEL);

			}

			if (flags & USER_CTX_SWITCH) {

			if (flags & USER_CTX_SWITCH

			    && op_cpu_buffer_get_data(&entry, &val)) {

				/* userspace context switch */

				new = (struct task_struct *)val;

				oldmm = mm;

				new = (struct task_struct *)sample->data[0];

				release_mm(oldmm);

				mm = take_tasks_mm(new);

				if (mm != oldmm)

drivers/oprofile/cpu_buffer.h

+20 −0
Original line number Diff line number Diff line
@@ -90,6 +90,26 @@ int op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val) 
	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)