fweisbec at gmail
Nov 23, 2009, 6:42 AM
Post #1 of 1
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[PATCH 3/4] perf: Add kernel side syscall events support for breakpoints
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Add the remaining necessary bits to support breakpoints created through
perf syscall.
We don't use the software counter interface as:
- We don't need to check against recursion, this is already done in
hardware breakpoints arch level.
- We already know the perf event we are dealing with when the event
is to be committed.
Signed-off-by: Frederic Weisbecker <fweisbec [at] gmail>
Cc: Peter Zijlstra <peterz [at] infradead>
Cc: Arnaldo Carvalho de Melo <acme [at] redhat>
Cc: Paul Mackerras <paulus [at] samba>
Cc: Prasad <prasad [at] linux>
---
kernel/perf_event.c | 34 +++++++++++++++++++++++++---------
1 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 0b0d5f7..5fbca43 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -3826,6 +3826,20 @@ static int perf_swevent_is_counting(struct perf_event *event)
static int perf_tp_event_match(struct perf_event *event,
struct perf_sample_data *data);
+static int perf_exclude_event(struct perf_event *event,
+ struct pt_regs *regs)
+{
+ if (regs) {
+ if (event->attr.exclude_user && user_mode(regs))
+ return 1;
+
+ if (event->attr.exclude_kernel && !user_mode(regs))
+ return 1;
+ }
+
+ return 0;
+}
+
static int perf_swevent_match(struct perf_event *event,
enum perf_type_id type,
u32 event_id,
@@ -3837,16 +3851,12 @@ static int perf_swevent_match(struct perf_event *event,
if (event->attr.type != type)
return 0;
+
if (event->attr.config != event_id)
return 0;
- if (regs) {
- if (event->attr.exclude_user && user_mode(regs))
- return 0;
-
- if (event->attr.exclude_kernel && !user_mode(regs))
- return 0;
- }
+ if (perf_exclude_event(event, regs))
+ return 0;
if (event->attr.type == PERF_TYPE_TRACEPOINT &&
!perf_tp_event_match(event, data))
@@ -4277,9 +4287,15 @@ static const struct pmu *bp_perf_event_init(struct perf_event *bp)
return &perf_ops_bp;
}
-void perf_bp_event(struct perf_event *bp, void *regs)
+void perf_bp_event(struct perf_event *bp, void *data)
{
- /* TODO */
+ struct perf_sample_data sample;
+ struct pt_regs *regs = data;
+
+ sample.addr = bp->attr.bp_addr;
+
+ if (!perf_exclude_event(bp, regs))
+ perf_swevent_add(bp, 1, 1, &sample, regs);
}
#else
static void bp_perf_event_destroy(struct perf_event *event)
--
1.6.2.3
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