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ftrace: convert single large buffer into single pages.

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Allocating large buffers for the tracer may fail easily.
This patch converts the buffer from a large ordered allocation
to single pages. It uses the struct page LRU field to link the
pages together.

Later patches may also implement dynamic increasing and decreasing
of the trace buffers.

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 21:20:43 +02:00
committed by Thomas Gleixner
parent 5072c59fd4
commit 4c11d7aed3
2 changed files with 195 additions and 58 deletions
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kernel/trace/trace.h
+6 -2
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@@ -54,9 +54,11 @@ struct trace_entry {
*/
struct trace_array_cpu {
void *trace;
void *trace_current;
unsigned trace_current_idx;
struct list_head trace_pages;
unsigned long trace_idx;
atomic_t disabled;
atomic_t underrun;
unsigned long saved_latency;
unsigned long critical_start;
unsigned long critical_end;
@@ -112,8 +114,10 @@ struct trace_iterator {
unsigned long iter_flags;
loff_t pos;
unsigned long next_idx[NR_CPUS];
struct list_head *next_page[NR_CPUS];
unsigned next_page_idx[NR_CPUS];
long idx;
int cpu;
int idx;
};
void notrace tracing_reset(struct trace_array_cpu *data);