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author | Hou Pengyang | 2015-05-08 07:43:03 +0200 |
---|---|---|
committer | Will Deacon | 2015-05-27 17:12:05 +0200 |
commit | b3eac0265bf6258f08dcd4ac7fa7f87cc050defc (patch) | |
tree | 5f3aef7fbf03d55801a9a53e368b6a369e3a8280 /arch/arm/include | |
parent | Linux 4.1-rc1 (diff) | |
download | kernel-qcow2-linux-b3eac0265bf6258f08dcd4ac7fa7f87cc050defc.tar.gz kernel-qcow2-linux-b3eac0265bf6258f08dcd4ac7fa7f87cc050defc.tar.xz kernel-qcow2-linux-b3eac0265bf6258f08dcd4ac7fa7f87cc050defc.zip |
arm: perf: Fix callchain parse error with kernel tracepoint events
For ARM, when tracing with tracepoint events, the IP and cpsr are set
to 0, preventing the perf code parsing the callchain and resolving the
symbols correctly.
./perf record -e sched:sched_switch -g --call-graph dwarf ls
[ perf record: Captured and wrote 0.006 MB perf.data ]
./perf report -f
Samples: 5 of event 'sched:sched_switch', Event count (approx.): 5
Children Self Command Shared Object Symbol
100.00% 100.00% ls [unknown] [.] 00000000
The fix is to implement perf_arch_fetch_caller_regs for ARM, which fills
several necessary registers used for callchain unwinding, including pc,sp,
fp and cpsr.
With this patch, callchain can be parsed correctly as :
.....
- 100.00% 100.00% ls [kernel.kallsyms] [k] __sched_text_start
+ __sched_text_start
+ 20.00% 0.00% ls libc-2.18.so [.] _dl_addr
+ 20.00% 0.00% ls libc-2.18.so [.] write
.....
Jean Pihet found this in ARM and come up with a patch:
http://thread.gmane.org/gmane.linux.kernel/1734283/focus=1734280
This patch rewrite Jean's patch in C.
Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/include')
-rw-r--r-- | arch/arm/include/asm/perf_event.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/include/asm/perf_event.h b/arch/arm/include/asm/perf_event.h index d9cf138fd7d4..4f9dec489931 100644 --- a/arch/arm/include/asm/perf_event.h +++ b/arch/arm/include/asm/perf_event.h @@ -19,4 +19,11 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs); #define perf_misc_flags(regs) perf_misc_flags(regs) #endif +#define perf_arch_fetch_caller_regs(regs, __ip) { \ + (regs)->ARM_pc = (__ip); \ + (regs)->ARM_fp = (unsigned long) __builtin_frame_address(0); \ + (regs)->ARM_sp = current_stack_pointer; \ + (regs)->ARM_cpsr = SVC_MODE; \ +} + #endif /* __ARM_PERF_EVENT_H__ */ |