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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
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@@ -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)