From 2cc28b9f261dd28d69767a34682ce55a27d928ed Mon Sep 17 00:00:00 2001 From: Robert Richter Date: Thu, 25 Dec 2008 17:26:07 +0100 Subject: 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 --- drivers/oprofile/cpu_buffer.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/oprofile/cpu_buffer.h') diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h index 65b763ad72d..2d4bfdeb7fb 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 + * @author Robert Richter */ #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); -- cgit v1.2.3