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authorVineet Gupta <vgupta@synopsys.com>2013-07-12 15:55:54 +0200
committerVineet Gupta <vgupta@synopsys.com>2015-04-20 18:27:35 +0530
commit22f6b899125063c5dc955dd378c408b14d80b020 (patch)
tree677996c14b63020d4050ad4669f5b99dc99150ae
parent389e3160b9b0002f8e7c95e9c0af5da6da311892 (diff)
downloadop-kernel-dev-22f6b899125063c5dc955dd378c408b14d80b020.zip
op-kernel-dev-22f6b899125063c5dc955dd378c408b14d80b020.tar.gz
ARC: perf: add user space attribution in callchains
The actual user space unwinding is more involved, so simply capture the user space PC Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
-rw-r--r--arch/arc/kernel/perf_event.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index a6ad1e0..109118a 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -54,6 +54,16 @@ perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
arc_unwind_core(NULL, regs, callchain_trace, &ctrl);
}
+void
+perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
+{
+ /*
+ * User stack can't be unwound trivially with kernel dwarf unwinder
+ * So for now just record the user PC
+ */
+ perf_callchain_store(entry, instruction_pointer(regs));
+}
+
static struct arc_pmu *arc_pmu;
/* read counter #idx; note that counter# != event# on ARC! */
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