Messages in this thread Patch in this message | | | Date | Thu, 13 Jun 2013 16:21:11 -0700 | From | Jed Davis <> | Subject | [PATCH] perf: ARM: Record the user-mode PC in the call chain. |
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With this change, we no longer lose the innermost entry in the user-mode part of the call chain. See also the x86 port, which includes the ip.
It's possible to partially work around this problem by post-processing the data to use the PERF_SAMPLE_IP value, but this works only if the CPU wasn't in the kernel when the sample was taken.
Signed-off-by: Jed Davis <jld@mozilla.com> --- arch/arm/kernel/perf_event.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 8c3094d..d9f5cd4 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -569,6 +569,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) return; } + perf_callchain_store(entry, regs->ARM_pc); tail = (struct frame_tail __user *)regs->ARM_fp - 1; while ((entry->nr < PERF_MAX_STACK_DEPTH) && -- 1.7.10.4
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