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oprofile: add op_cpu_buffer_get_data()

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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: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2009-01-06 03:56:50 +01:00
parent d9928c25a6
commit bd7dc46f77
2 changed files with 24 additions and 2 deletions
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6
drivers/oprofile/buffer_sync.c
View file

@ -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)

20
drivers/oprofile/cpu_buffer.h
View file

@ -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)