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tracepoints: add DECLARE_TRACE() and DEFINE_TRACE()

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Impact: API *CHANGE*. Must update all tracepoint users.

Add DEFINE_TRACE() to tracepoints to let them declare the tracepoint
structure in a single spot for all the kernel. It helps reducing memory
consumption, especially when declaring a lot of tracepoints, e.g. for
kmalloc tracing.

*API CHANGE WARNING*: now, DECLARE_TRACE() must be used in headers for
tracepoint declarations rather than DEFINE_TRACE(). This is the sane way
to do it. The name previously used was misleading.

Updates scheduler instrumentation to follow this API change.

Signed-off-by: Mathieu Desnoyers <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Mathieu Desnoyers 2008-11-14 17:47:47 -05:00 • committed by Ingo Molnar
commit 7e066fb870
11 changed files with 66 additions and 25 deletions
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4
samples/tracepoints/tp-samples-trace.h
View file

@ -4,10 +4,10 @@
#include <linux/proc_fs.h> /* for struct inode and struct file */
#include <linux/tracepoint.h>
DEFINE_TRACE(subsys_event,
DECLARE_TRACE(subsys_event,
TPPROTO(struct inode *inode, struct file *file),
TPARGS(inode, file));
DEFINE_TRACE(subsys_eventb,
DECLARE_TRACE(subsys_eventb,
TPPROTO(void),
TPARGS());
#endif

3
samples/tracepoints/tracepoint-sample.c
View file

@ -13,6 +13,9 @@
#include <linux/proc_fs.h>
#include "tp-samples-trace.h"
DEFINE_TRACE(subsys_event);
DEFINE_TRACE(subsys_eventb);
struct proc_dir_entry *pentry_example;
static int my_open(struct inode *inode, struct file *file)