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authorAvi Kivity <avi@redhat.com>2011-06-29 19:42:35 +0400
committerIngo Molnar <mingo@elte.hu>2011-07-01 13:06:38 +0400
commit4dc0da86967d5463708631d02a70cfed5b104884 (patch)
treee09071a62f2457b710ff69df3be1bff39340a4c6 /include/linux/perf_event.h
parent89d6c0b5bdbb1927775584dcf532d98b3efe1477 (diff)
downloadlinux-4dc0da86967d5463708631d02a70cfed5b104884.tar.xz
perf: Add context field to perf_event
The perf_event overflow handler does not receive any caller-derived argument, so many callers need to resort to looking up the perf_event in their local data structure. This is ugly and doesn't scale if a single callback services many perf_events. Fix by adding a context parameter to perf_event_create_kernel_counter() (and derived hardware breakpoints APIs) and storing it in the perf_event. The field can be accessed from the callback as event->overflow_handler_context. All callers are updated. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1309362157-6596-2-git-send-email-avi@redhat.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index a5f54b973bdb..2a08cacb1628 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -839,6 +839,7 @@ struct perf_event {
u64 id;
perf_overflow_handler_t overflow_handler;
+ void *overflow_handler_context;
#ifdef CONFIG_EVENT_TRACING
struct ftrace_event_call *tp_event;
@@ -960,7 +961,8 @@ extern struct perf_event *
perf_event_create_kernel_counter(struct perf_event_attr *attr,
int cpu,
struct task_struct *task,
- perf_overflow_handler_t callback);
+ perf_overflow_handler_t callback,
+ void *context);
extern u64 perf_event_read_value(struct perf_event *event,
u64 *enabled, u64 *running);