diff options
| author | Jed Davis <jld@mozilla.com> | 2013-06-20 10:16:29 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-07-27 05:34:16 +0100 |
| commit | 8c7c7cec2608c2a9cfbc4153a79b0dbae9d7a801 (patch) | |
| tree | 3318ac73d30e3412198e7872f4f00c9606c63b7f /arch/arm/kernel/perf_event.c | |
| parent | 6d2d894ed086b26f8e507219e9f5709526efa4b2 (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: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/arm/kernel/perf_event.c')
| -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 a559ee7b6304..778d24857451 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -795,6 +795,7 @@ 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) && |