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Commit 22f6b899 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

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: default avatarVineet Gupta <vgupta@synopsys.com>
parent 389e3160

arch/arc/kernel/perf_event.c

+10 −0
Original line number Diff line number Diff line
@@ -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! */