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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-07-12 15:55:54 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-04-20 14:57:35 +0200 |
| commit | 22f6b899125063c5dc955dd378c408b14d80b020 (patch) | |
| tree | 677996c14b63020d4050ad4669f5b99dc99150ae /arch/arc/kernel/perf_event.c | |
| parent | ARC: perf: Add kernel callchain support (diff) | |
| download | linux-22f6b899125063c5dc955dd378c408b14d80b020.tar.xz linux-22f6b899125063c5dc955dd378c408b14d80b020.zip | |
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>
Diffstat (limited to 'arch/arc/kernel/perf_event.c')
| -rw-r--r-- | arch/arc/kernel/perf_event.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c index a6ad1e09e4be..109118a4245e 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! */ |