On 8/6/15 12:02 AM, Kaixu Xia wrote:
This is a simple example and shows how to use the new ability
to get the selected Hardware PMU counter value.
Signed-off-by: Kaixu Xia <xiaka...@huawei.com>
---
samples/bpf/Makefile | 4 +++
samples/bpf/bpf_helpers.h | 2 ++
samples/bpf/tracex6_kern.c | 26 ++++++++++++++++++
samples/bpf/tracex6_user.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++
1.
I see a bunch of warnings building it:
HOSTCC samples/bpf/tracex6_user.o
../samples/bpf/tracex6_user.c: In function ‘test_bpf_perf_event’:
../samples/bpf/tracex6_user.c:49:2: warning: passing argument 1 of
‘close’ makes integer from pointer without a cast [enabled by default]
In file included from ../samples/bpf/tracex6_user.c:2:0:
/usr/include/unistd.h:354:12: note: expected ‘int’ but argument is of
type ‘int *’
../samples/bpf/tracex6_user.c:20:16: warning: unused variable ‘value’
[-Wunused-variable]
../samples/bpf/tracex6_user.c:42:8: warning: ignoring return value of
‘system’, declared with attribute warn_unused_result [-Wunused-result]
../samples/bpf/tracex6_user.c:43:8: warning: ignoring return value of
‘system’, declared with attribute warn_unused_result [-Wunused-result]
../samples/bpf/tracex6_user.c:44:8: warning: ignoring return value of
‘system’, declared with attribute warn_unused_result [-Wunused-result]
HOSTLD samples/bpf/tracex6
HOSTCC samples/bpf/lathist_user.o
HOSTLD samples/bpf/lathist
clang -nostdinc -isystem /usr/lib/gcc/x86_64-linux-gnu/4.7/include
-I../arch/x86/include -Iarch/x86/include/generated/uapi
-Iarch/x86/include/generated -I../include -Iinclude
-I../arch/x86/include/uapi -Iarch/x86/include/generated/uapi
-I../include/uapi -Iinclude/generated/uapi -include
../include/linux/kconfig.h \
-D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
-O2 -emit-llvm -c ../samples/bpf/tracex6_kern.c -o -|
../tools/bpf/llvm/bld/Debug+Asserts/bin/llc -march=bpf -filetype=obj -o
samples/bpf/tracex6_kern.o
../samples/bpf/tracex6_kern.c:13:22: warning: declaration of 'struct
pt_regs' will not be visible outside of this function [-Wvisibility]
int bpf_prog1(struct pt_regs *ctx)
Please fix.
2.
the example is incomplete.
Please add read_trace_pipe() otherwise it exits without printing
anything useful.
3.
please replace ls and pwd with ls > /dev/null
the spam on the screen is unnecessary.
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