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| author | Jed Davis <jld@mozilla.com> | 2013-06-20 10:16:29 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-06-24 15:23:29 +0100 |
| commit | c5f927a6f62196226915f12194c9d0df4e2210d7 (patch) | |
| tree | 1e671090fae699d4327eb173682ae4115fb94dd8 /arch/arm/kernel/perf_event.c | |
| parent | a4780adeefd042482f624f5e0d577bf9cdcbb760 (diff) | |
| download | linux-c5f927a6f62196226915f12194c9d0df4e2210d7.tar.gz linux-c5f927a6f62196226915f12194c9d0df4e2210d7.tar.bz2 linux-c5f927a6f62196226915f12194c9d0df4e2210d7.zip | |
ARM: 7765/1: perf: Record the user-mode PC in the call chain.
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.
Cc: <stable@vger.kernel.org>
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>
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 8c3094d0f7b7..d9f5cd4e533f 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) && |