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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>
This commit is contained in:
Vineet Gupta 2013-07-12 15:55:54 +02:00
parent 389e3160b9
commit 22f6b89912
1 changed files with 10 additions and 0 deletions
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10
arch/arc/kernel/perf_event.c
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@ -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! */