* can be changed to a single buffer solution when the ring buffer
* access is implemented as non-locking atomic code.
*/
-struct ring_buffer *op_ring_buffer_read;
-struct ring_buffer *op_ring_buffer_write;
+static struct ring_buffer *op_ring_buffer_read;
+static struct ring_buffer *op_ring_buffer_write;
DEFINE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
static void wq_sync_buffer(struct work_struct *work);
#define DEFAULT_TIMER_EXPIRE (HZ / 10)
static int work_enabled;
-void free_cpu_buffers(void)
-{
- if (op_ring_buffer_read)
- ring_buffer_free(op_ring_buffer_read);
- op_ring_buffer_read = NULL;
- if (op_ring_buffer_write)
- ring_buffer_free(op_ring_buffer_write);
- op_ring_buffer_write = NULL;
-}
-
unsigned long oprofile_get_cpu_buffer_size(void)
{
- return fs_cpu_buffer_size;
+ return oprofile_cpu_buffer_size;
}
void oprofile_cpu_buffer_inc_smpl_lost(void)
cpu_buf->sample_lost_overflow++;
}
+void free_cpu_buffers(void)
+{
+ if (op_ring_buffer_read)
+ ring_buffer_free(op_ring_buffer_read);
+ op_ring_buffer_read = NULL;
+ if (op_ring_buffer_write)
+ ring_buffer_free(op_ring_buffer_write);
+ op_ring_buffer_write = NULL;
+}
+
int alloc_cpu_buffers(void)
{
int i;
- unsigned long buffer_size = fs_cpu_buffer_size;
+ unsigned long buffer_size = oprofile_cpu_buffer_size;
op_ring_buffer_read = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
if (!op_ring_buffer_read)
flush_scheduled_work();
}
-static inline void
+int op_cpu_buffer_write_entry(struct op_entry *entry)
+{
+ entry->event = ring_buffer_lock_reserve(op_ring_buffer_write,
+ sizeof(struct op_sample),
+ &entry->irq_flags);
+ if (entry->event)
+ entry->sample = ring_buffer_event_data(entry->event);
+ else
+ entry->sample = NULL;
+
+ if (!entry->sample)
+ return -ENOMEM;
+
+ return 0;
+}
+
+int op_cpu_buffer_write_commit(struct op_entry *entry)
+{
+ return ring_buffer_unlock_commit(op_ring_buffer_write, entry->event,
+ entry->irq_flags);
+}
+
+struct op_sample *op_cpu_buffer_read_entry(int cpu)
+{
+ struct ring_buffer_event *e;
+ e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
+ if (e)
+ return ring_buffer_event_data(e);
+ if (ring_buffer_swap_cpu(op_ring_buffer_read,
+ op_ring_buffer_write,
+ cpu))
+ return NULL;
+ e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
+ if (e)
+ return ring_buffer_event_data(e);
+ return NULL;
+}
+
+unsigned long op_cpu_buffer_entries(int cpu)
+{
+ return ring_buffer_entries_cpu(op_ring_buffer_read, cpu)
+ + ring_buffer_entries_cpu(op_ring_buffer_write, cpu);
+}
+
+static inline int
add_sample(struct oprofile_cpu_buffer *cpu_buf,
unsigned long pc, unsigned long event)
{
struct op_entry entry;
+ int ret;
- if (cpu_buffer_write_entry(&entry))
- goto Error;
+ ret = op_cpu_buffer_write_entry(&entry);
+ if (ret)
+ return ret;
entry.sample->eip = pc;
entry.sample->event = event;
- if (cpu_buffer_write_commit(&entry))
- goto Error;
-
- return;
+ ret = op_cpu_buffer_write_commit(&entry);
+ if (ret)
+ return ret;
-Error:
- cpu_buf->sample_lost_overflow++;
- return;
+ return 0;
}
-static inline void
+static inline int
add_code(struct oprofile_cpu_buffer *buffer, unsigned long value)
{
- add_sample(buffer, ESCAPE_CODE, value);
+ return add_sample(buffer, ESCAPE_CODE, value);
}
/* This must be safe from any context. It's safe writing here
/* notice a switch from user->kernel or vice versa */
if (cpu_buf->last_is_kernel != is_kernel) {
cpu_buf->last_is_kernel = is_kernel;
- add_code(cpu_buf, is_kernel);
+ if (add_code(cpu_buf, is_kernel))
+ goto fail;
}
/* notice a task switch */
if (cpu_buf->last_task != task) {
cpu_buf->last_task = task;
- add_code(cpu_buf, (unsigned long)task);
+ if (add_code(cpu_buf, (unsigned long)task))
+ goto fail;
}
- add_sample(cpu_buf, pc, event);
+ if (add_sample(cpu_buf, pc, event))
+ goto fail;
+
return 1;
+
+fail:
+ cpu_buf->sample_lost_overflow++;
+ return 0;
}
static int oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
{
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
- if (!backtrace_depth) {
+ if (!oprofile_backtrace_depth) {
log_sample(cpu_buf, pc, is_kernel, event);
return;
}
* source of this event
*/
if (log_sample(cpu_buf, pc, is_kernel, event))
- oprofile_ops.backtrace(regs, backtrace_depth);
+ oprofile_ops.backtrace(regs, oprofile_backtrace_depth);
oprofile_end_trace(cpu_buf);
}
int is_kernel = !user_mode(regs);
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
struct task_struct *task;
+ int fail = 0;
cpu_buf->sample_received++;
/* notice a switch from user->kernel or vice versa */
if (cpu_buf->last_is_kernel != is_kernel) {
+ if (add_code(cpu_buf, is_kernel))
+ goto fail;
cpu_buf->last_is_kernel = is_kernel;
- add_code(cpu_buf, is_kernel);
}
/* notice a task switch */
if (!is_kernel) {
task = current;
if (cpu_buf->last_task != task) {
+ if (add_code(cpu_buf, (unsigned long)task))
+ goto fail;
cpu_buf->last_task = task;
- add_code(cpu_buf, (unsigned long)task);
}
}
- add_code(cpu_buf, ibs_code);
- add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
- add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
- add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
+ fail = fail || add_code(cpu_buf, ibs_code);
+ fail = fail || add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
+ fail = fail || add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
+ fail = fail || add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
if (ibs_code == IBS_OP_BEGIN) {
- add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
- add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
- add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
+ fail = fail || add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
+ fail = fail || add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
+ fail = fail || add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
}
- if (backtrace_depth)
- oprofile_ops.backtrace(regs, backtrace_depth);
+ if (fail)
+ goto fail;
+
+ if (oprofile_backtrace_depth)
+ oprofile_ops.backtrace(regs, oprofile_backtrace_depth);
+
+ return;
+
+fail:
+ cpu_buf->sample_lost_overflow++;
+ return;
}
#endif
* broken frame can give an eip with the same value as an
* escape code, abort the trace if we get it
*/
- if (pc == ESCAPE_CODE) {
- cpu_buf->tracing = 0;
- cpu_buf->backtrace_aborted++;
- return;
- }
+ if (pc == ESCAPE_CODE)
+ goto fail;
+
+ if (add_sample(cpu_buf, pc, 0))
+ goto fail;
- add_sample(cpu_buf, pc, 0);
+ return;
+fail:
+ cpu_buf->tracing = 0;
+ cpu_buf->backtrace_aborted++;
+ return;
}
/*
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff