summaryrefslogtreecommitdiff
path: root/drivers/oprofile/cpu_buffer.h
diff options
context:
space:
mode:
authorRobert Richter <robert.richter@amd.com>2008-12-25 17:26:07 +0100
committerRobert Richter <robert.richter@amd.com>2009-01-07 22:37:44 +0100
commit2cc28b9f261dd28d69767a34682ce55a27d928ed (patch)
treeeb99ee33781cc79ab09f2d70c93f14c90c664f91 /drivers/oprofile/cpu_buffer.h
parentd358e75fc40cc3bbab11654ba0a88b232c543d12 (diff)
downloadlinux-sh-2cc28b9f261dd28d69767a34682ce55a27d928ed.tar.gz
oprofile: add op_cpu_buffer_write_reserve()
This function prepares the cpu buffer to write a sample. Struct op_entry is used during operations on the ring buffer while struct op_sample contains the data that is stored in the ring buffer. Struct entry can be uninitialized. The function reserves a data array that is specified by size. Use op_cpu_buffer_write_commit() after preparing the sample. In case of errors a null pointer is returned, otherwise the pointer to the sample. Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'drivers/oprofile/cpu_buffer.h')
-rw-r--r--drivers/oprofile/cpu_buffer.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index 65b763ad72da..2d4bfdeb7fba 100644
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -1,10 +1,11 @@
/**
* @file cpu_buffer.h
*
- * @remark Copyright 2002 OProfile authors
+ * @remark Copyright 2002-2009 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
+ * @author Robert Richter <robert.richter@amd.com>
*/
#ifndef OPROFILE_CPU_BUFFER_H
@@ -31,12 +32,15 @@ void end_cpu_work(void);
struct op_sample {
unsigned long eip;
unsigned long event;
+ unsigned long data[0];
};
struct op_entry {
struct ring_buffer_event *event;
struct op_sample *sample;
unsigned long irq_flags;
+ unsigned long size;
+ unsigned long *data;
};
struct oprofile_cpu_buffer {
@@ -68,7 +72,8 @@ static inline void op_cpu_buffer_reset(int cpu)
cpu_buf->last_task = NULL;
}
-int op_cpu_buffer_write_entry(struct op_entry *entry);
+struct op_sample
+*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);
int op_cpu_buffer_write_commit(struct op_entry *entry);
struct op_sample *op_cpu_buffer_read_entry(int cpu);
unsigned long op_cpu_buffer_entries(int cpu);