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| author | Jed Davis <jld@mozilla.com> | 2013-06-20 10:16:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-21 18:21:33 -0700 |
| commit | c9f3f7f79f3ee852f253bdb1dbbb43d79bcaa6c2 (patch) | |
| tree | 186f03e513366b81ccd1053812c2b7e36bf3371b | |
| parent | 7557d8d5a46aaa4d0ec98bffdeedf9f3c7464088 (diff) | |
| download | linux-3.10-c9f3f7f79f3ee852f253bdb1dbbb43d79bcaa6c2.tar.gz linux-3.10-c9f3f7f79f3ee852f253bdb1dbbb43d79bcaa6c2.tar.bz2 linux-3.10-c9f3f7f79f3ee852f253bdb1dbbb43d79bcaa6c2.zip | |
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 8c3094d0f7b..d9f5cd4e533 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) && |