diff options
| author | Jed Davis <jld@mozilla.com> | 2013-06-20 10:16:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-21 18:14:41 -0700 |
| commit | cd8bca6fe4862f5af7244a5f5e4b08788ccaff11 (patch) | |
| tree | cfcad94b68d87c93177893d00a5c6b1532bf5262 | |
| parent | 4b9cf8edf9d6203e0ed7a38844f8c3c35b101a61 (diff) | |
ARM: 7765/1: perf: Record the user-mode PC in the call chain.
commit c5f927a6f62196226915f12194c9d0df4e2210d7 upstream.
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>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/arm/kernel/perf_event.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 2b5b1421596..75373a94701 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -741,6 +741,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) struct frame_tail __user *tail; + perf_callchain_store(entry, regs->ARM_pc); tail = (struct frame_tail __user *)regs->ARM_fp - 1; while ((entry->nr < PERF_MAX_STACK_DEPTH) && |