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hw-breakpoints: Use overflow handler instead of the event callback

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struct perf_event::event callback was called when a breakpoint
triggers. But this is a rather opaque callback, pretty
tied-only to the breakpoint API and not really integrated into perf
as it triggers even when we don't overflow.

We prefer to use overflow_handler() as it fits into the perf events
rules, being called only when we overflow.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
This commit is contained in:
Frederic Weisbecker
2009-12-05 09:44:31 +01:00
parent 2f0993e0fb
commit b326e9560a
8 changed files with 48 additions and 57 deletions
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13
include/linux/perf_event.h
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@@ -565,10 +565,13 @@ struct perf_pending_entry {
void (*func)(struct perf_pending_entry *);
};
typedef void (*perf_callback_t)(struct perf_event *, void *);
struct perf_sample_data;
typedef void (*perf_callback_t)(struct perf_event *, void *);
typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
struct perf_sample_data *,
struct pt_regs *regs);
/**
* struct perf_event - performance event kernel representation:
*/
@@ -660,9 +663,7 @@ struct perf_event {
struct pid_namespace *ns;
u64 id;
void (*overflow_handler)(struct perf_event *event,
int nmi, struct perf_sample_data *data,
struct pt_regs *regs);
perf_overflow_handler_t overflow_handler;
#ifdef CONFIG_EVENT_PROFILE
struct event_filter *filter;
@@ -779,7 +780,7 @@ extern struct perf_event *
perf_event_create_kernel_counter(struct perf_event_attr *attr,
int cpu,
pid_t pid,
perf_callback_t callback);
perf_overflow_handler_t callback);
extern u64 perf_event_read_value(struct perf_event *event,
u64 *enabled, u64 *running);