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ftrace: change buffers to producer consumer

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This patch changes the way the CPU trace buffers are handled.
Instead of always starting from the trace page head, the logic
is changed to a producer consumer logic. This allows for the
buffers to be drained while they are alive.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Steven Rostedt
2008-05-12 21:20:45 +02:00
committed by Thomas Gleixner
parent 1d4db00a5e
commit 93a588f459
2 changed files with 65 additions and 44 deletions
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6
kernel/trace/trace.h
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@ -53,13 +53,15 @@ struct trace_entry {
* the trace, etc.)
*/
struct trace_array_cpu {
void *trace_current;
struct list_head trace_pages;
atomic_t disabled;
cycle_t time_offset;
/* these fields get copied into max-trace: */
unsigned trace_current_idx;
unsigned trace_head_idx;
unsigned trace_tail_idx;
void *trace_head; /* producer */
void *trace_tail; /* consumer */
unsigned long trace_idx;
unsigned long saved_latency;
unsigned long critical_start;