[PATCH v3 16/17] tracing output: use new hashtable implementation
Switch tracing to use the new hashtable implementation. This reduces the amount
of
generic unrelated code in the tracing module.
Signed-off-by: Sasha Levin
---
kernel/trace/trace_output.c | 20
1 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 123b189..1324c1a 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -8,15 +8,15 @@
#include
#include
#include
+#include
#include "trace_output.h"
-/* must be a power of 2 */
-#define EVENT_HASHSIZE 128
+#define EVENT_HASH_BITS7
DECLARE_RWSEM(trace_event_mutex);
-static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
+static DEFINE_HASHTABLE(event_hash, EVENT_HASH_BITS);
static int next_event_type = __TRACE_LAST_TYPE + 1;
@@ -712,11 +712,8 @@ struct trace_event *ftrace_find_event(int type)
{
struct trace_event *event;
struct hlist_node *n;
- unsigned key;
- key = type & (EVENT_HASHSIZE - 1);
-
- hlist_for_each_entry(event, n, _hash[key], node) {
+ hash_for_each_possible(event_hash, event, n, node, type) {
if (event->type == type)
return event;
}
@@ -781,7 +778,6 @@ void trace_event_read_unlock(void)
*/
int register_ftrace_event(struct trace_event *event)
{
- unsigned key;
int ret = 0;
down_write(_event_mutex);
@@ -833,9 +829,7 @@ int register_ftrace_event(struct trace_event *event)
if (event->funcs->binary == NULL)
event->funcs->binary = trace_nop_print;
- key = event->type & (EVENT_HASHSIZE - 1);
-
- hlist_add_head(>node, _hash[key]);
+ hash_add(event_hash, >node, event->type);
ret = event->type;
out:
@@ -850,7 +844,7 @@ EXPORT_SYMBOL_GPL(register_ftrace_event);
*/
int __unregister_ftrace_event(struct trace_event *event)
{
- hlist_del(>node);
+ hash_del(>node);
list_del(>list);
return 0;
}
@@ -1323,6 +1317,8 @@ __init static int init_events(void)
}
}
+ hash_init(event_hash);
+
return 0;
}
early_initcall(init_events);
--
1.7.8.6
--
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[PATCH v3 16/17] tracing output: use new hashtable implementation
Switch tracing to use the new hashtable implementation. This reduces the amount
of
generic unrelated code in the tracing module.
Signed-off-by: Sasha Levin levinsasha...@gmail.com
---
kernel/trace/trace_output.c | 20
1 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 123b189..1324c1a 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -8,15 +8,15 @@
#include linux/module.h
#include linux/mutex.h
#include linux/ftrace.h
+#include linux/hashtable.h
#include trace_output.h
-/* must be a power of 2 */
-#define EVENT_HASHSIZE 128
+#define EVENT_HASH_BITS7
DECLARE_RWSEM(trace_event_mutex);
-static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
+static DEFINE_HASHTABLE(event_hash, EVENT_HASH_BITS);
static int next_event_type = __TRACE_LAST_TYPE + 1;
@@ -712,11 +712,8 @@ struct trace_event *ftrace_find_event(int type)
{
struct trace_event *event;
struct hlist_node *n;
- unsigned key;
- key = type (EVENT_HASHSIZE - 1);
-
- hlist_for_each_entry(event, n, event_hash[key], node) {
+ hash_for_each_possible(event_hash, event, n, node, type) {
if (event-type == type)
return event;
}
@@ -781,7 +778,6 @@ void trace_event_read_unlock(void)
*/
int register_ftrace_event(struct trace_event *event)
{
- unsigned key;
int ret = 0;
down_write(trace_event_mutex);
@@ -833,9 +829,7 @@ int register_ftrace_event(struct trace_event *event)
if (event-funcs-binary == NULL)
event-funcs-binary = trace_nop_print;
- key = event-type (EVENT_HASHSIZE - 1);
-
- hlist_add_head(event-node, event_hash[key]);
+ hash_add(event_hash, event-node, event-type);
ret = event-type;
out:
@@ -850,7 +844,7 @@ EXPORT_SYMBOL_GPL(register_ftrace_event);
*/
int __unregister_ftrace_event(struct trace_event *event)
{
- hlist_del(event-node);
+ hash_del(event-node);
list_del(event-list);
return 0;
}
@@ -1323,6 +1317,8 @@ __init static int init_events(void)
}
}
+ hash_init(event_hash);
+
return 0;
}
early_initcall(init_events);
--
1.7.8.6
--
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the body of a message to majord...@vger.kernel.org
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Please read the FAQ at http://www.tux.org/lkml/
