599 lines
30 KiB
Plaintext
599 lines
30 KiB
Plaintext
We'll test the BTF encoder using perf's eBPF integration, but really we can plain
|
|
use clang directly, setting up all its options.
|
|
|
|
Using perf's integration will save some time here, to see all it does, use
|
|
'perf trace -vv' plus the options used below, then all the steps will be shown.
|
|
|
|
Build perf from the latest kernel sources, use it with clang/llvm like:
|
|
|
|
[root@seventh ~]# clang --version
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c)
|
|
Target: x86_64-unknown-linux-gnu
|
|
Thread model: posix
|
|
InstalledDir: /usr/local/bin
|
|
[root@seventh ~]# llc --version | head -17
|
|
LLVM (http://llvm.org/):
|
|
LLVM version 8.0.0svn
|
|
DEBUG build with assertions.
|
|
Default target: x86_64-unknown-linux-gnu
|
|
Host CPU: skylake
|
|
|
|
Registered Targets:
|
|
aarch64 - AArch64 (little endian)
|
|
aarch64_be - AArch64 (big endian)
|
|
amdgcn - AMD GCN GPUs
|
|
arm - ARM
|
|
arm64 - ARM64 (little endian)
|
|
armeb - ARM (big endian)
|
|
bpf - BPF (host endian)
|
|
bpfeb - BPF (big endian)
|
|
bpfel - BPF (little endian)
|
|
hexagon - Hexagon
|
|
[root@seventh ~]#
|
|
|
|
Then enable saving the object file build as part of perf's handling of foo.c type
|
|
events, i.e. eBPF programs that will be compiled with clang and then loaded with
|
|
sys_bpf() to possibly insert events in perf's ring buffer via bpf_perf_event_output(),
|
|
or interact with the system via bpf_trace_printk() or just work as filters, etc:
|
|
|
|
# cat ~/.perfconfig
|
|
[llvm]
|
|
dump-obj = true
|
|
|
|
Then run a simple example, found in the kernel sources:
|
|
|
|
# perf trace -e tools/perf/examples/bpf/hello.c cat /etc/passwd > /dev/null
|
|
LLVM: dumping tools/perf/examples/bpf/hello.o
|
|
0.000 __bpf_stdout__:Hello, world
|
|
0.028 __bpf_stdout__:Hello, world
|
|
0.291 __bpf_stdout__:Hello, world
|
|
#
|
|
|
|
Notice that "LLVM: dumping..." line, look at the ELF sections in that file:
|
|
|
|
[root@seventh perf]# readelf -SW tools/perf/examples/bpf/hello.o
|
|
There are 11 section headers, starting at offset 0x220:
|
|
|
|
Section Headers:
|
|
[Nr] Name Type Address Off Size ES Flg Lk Inf Al
|
|
[ 0] NULL 0000000000000000 000000 000000 00 0 0 0
|
|
[ 1] .strtab STRTAB 0000000000000000 00018c 00008d 00 0 0 1
|
|
[ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
|
|
[ 3] syscalls:sys_enter_openat PROGBITS 0000000000000000 000040 000088 00 AX 0 0 8
|
|
[ 4] .relsyscalls:sys_enter_openat REL 0000000000000000 000178 000010 10 10 3 8
|
|
[ 5] maps PROGBITS 0000000000000000 0000c8 00001c 00 WA 0 0 4
|
|
[ 6] .rodata.str1.1 PROGBITS 0000000000000000 0000e4 00000e 01 AMS 0 0 1
|
|
[ 7] license PROGBITS 0000000000000000 0000f2 000004 00 WA 0 0 1
|
|
[ 8] version PROGBITS 0000000000000000 0000f8 000004 00 WA 0 0 4
|
|
[ 9] .llvm_addrsig LOOS+0xfff4c03 0000000000000000 000188 000004 00 E 10 0 1
|
|
[10] .symtab SYMTAB 0000000000000000 000100 000078 18 1 1 8
|
|
Key to Flags:
|
|
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
|
|
L (link order), O (extra OS processing required), G (group), T (TLS),
|
|
C (compressed), x (unknown), o (OS specific), E (exclude),
|
|
p (processor specific)
|
|
[root@seventh perf]#
|
|
|
|
No DWARF debugging info, so we need to further customize ~/.perfconfig LLVM section:
|
|
|
|
[root@seventh perf]# cat ~/.perfconfig
|
|
[llvm]
|
|
dump-obj = true
|
|
clang-opt = -g
|
|
[root@seventh perf]# perf trace -e tools/perf/examples/bpf/hello.c cat /etc/passwd > /dev/null
|
|
LLVM: dumping tools/perf/examples/bpf/hello.o
|
|
0.000 __bpf_stdout__:Hello, world
|
|
0.015 __bpf_stdout__:Hello, world
|
|
0.184 __bpf_stdout__:Hello, world
|
|
[root@seventh perf]#
|
|
[root@seventh perf]# readelf -SW tools/perf/examples/bpf/hello.o
|
|
There are 26 section headers, starting at offset 0xe20:
|
|
|
|
Section Headers:
|
|
[Nr] Name Type Address Off Size ES Flg Lk Inf Al
|
|
[ 0] NULL 0000000000000000 000000 000000 00 0 0 0
|
|
[ 1] .strtab STRTAB 0000000000000000 000cf4 000127 00 0 0 1
|
|
[ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
|
|
[ 3] syscalls:sys_enter_openat PROGBITS 0000000000000000 000040 000088 00 AX 0 0 8
|
|
[ 4] .relsyscalls:sys_enter_openat REL 0000000000000000 000a80 000010 10 25 3 8
|
|
[ 5] maps PROGBITS 0000000000000000 0000c8 00001c 00 WA 0 0 4
|
|
[ 6] .rodata.str1.1 PROGBITS 0000000000000000 0000e4 00000e 01 AMS 0 0 1
|
|
[ 7] license PROGBITS 0000000000000000 0000f2 000004 00 WA 0 0 1
|
|
[ 8] version PROGBITS 0000000000000000 0000f8 000004 00 WA 0 0 4
|
|
[ 9] .debug_str PROGBITS 0000000000000000 0000fc 0001d2 01 MS 0 0 1
|
|
[10] .debug_loc PROGBITS 0000000000000000 0002ce 000023 00 0 0 1
|
|
[11] .debug_abbrev PROGBITS 0000000000000000 0002f1 0000e3 00 0 0 1
|
|
[12] .debug_info PROGBITS 0000000000000000 0003d4 000182 00 0 0 1
|
|
[13] .rel.debug_info REL 0000000000000000 000a90 000210 10 25 12 8
|
|
[14] .debug_ranges PROGBITS 0000000000000000 000556 000030 00 0 0 1
|
|
[15] .debug_macinfo PROGBITS 0000000000000000 000586 000001 00 0 0 1
|
|
[16] .debug_pubnames PROGBITS 0000000000000000 000587 00006e 00 0 0 1
|
|
[17] .rel.debug_pubnames REL 0000000000000000 000ca0 000010 10 25 16 8
|
|
[18] .debug_pubtypes PROGBITS 0000000000000000 0005f5 000056 00 0 0 1
|
|
[19] .rel.debug_pubtypes REL 0000000000000000 000cb0 000010 10 25 18 8
|
|
[20] .debug_frame PROGBITS 0000000000000000 000650 000028 00 0 0 8
|
|
[21] .rel.debug_frame REL 0000000000000000 000cc0 000020 10 25 20 8
|
|
[22] .debug_line PROGBITS 0000000000000000 000678 0000a7 00 0 0 1
|
|
[23] .rel.debug_line REL 0000000000000000 000ce0 000010 10 25 22 8
|
|
[24] .llvm_addrsig LOOS+0xfff4c03 0000000000000000 000cf0 000004 00 E 25 0 1
|
|
[25] .symtab SYMTAB 0000000000000000 000720 000360 18 1 32 8
|
|
Key to Flags:
|
|
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
|
|
L (link order), O (extra OS processing required), G (group), T (TLS),
|
|
C (compressed), x (unknown), o (OS specific), E (exclude),
|
|
p (processor specific)
|
|
[root@seventh perf]#
|
|
|
|
Now lets use 'pahole --btf_encode' (or 'pahole -J') to add an ELF section to that object
|
|
file with the conversion from the DWARF sections to a new one, for BTF:
|
|
|
|
[root@seventh perf]# pahole --btf_encode tools/perf/examples/bpf/hello.o
|
|
|
|
[root@seventh perf]# readelf -SW tools/perf/examples/bpf/hello.o
|
|
There are 27 section headers, starting at offset 0x1080:
|
|
|
|
Section Headers:
|
|
[Nr] Name Type Address Off Size ES Flg Lk Inf Al
|
|
[ 0] NULL 0000000000000000 000000 000000 00 0 0 0
|
|
[ 1] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
|
|
[ 2] syscalls:sys_enter_openat PROGBITS 0000000000000000 000040 000088 00 AX 0 0 8
|
|
[ 3] maps PROGBITS 0000000000000000 0000c8 00001c 00 WA 0 0 4
|
|
[ 4] .rodata.str1.1 PROGBITS 0000000000000000 0000e4 00000e 01 AMS 0 0 1
|
|
[ 5] license PROGBITS 0000000000000000 0000f2 000004 00 WA 0 0 1
|
|
[ 6] version PROGBITS 0000000000000000 0000f8 000004 00 WA 0 0 4
|
|
[ 7] .debug_str PROGBITS 0000000000000000 0000fc 0001d2 01 MS 0 0 1
|
|
[ 8] .debug_loc PROGBITS 0000000000000000 0002ce 000023 00 0 0 1
|
|
[ 9] .debug_abbrev PROGBITS 0000000000000000 0002f1 0000e3 00 0 0 1
|
|
[10] .debug_info PROGBITS 0000000000000000 0003d4 000182 00 0 0 1
|
|
[11] .debug_ranges PROGBITS 0000000000000000 000556 000030 00 0 0 1
|
|
[12] .debug_macinfo PROGBITS 0000000000000000 000586 000001 00 0 0 1
|
|
[13] .debug_pubnames PROGBITS 0000000000000000 000587 00006e 00 0 0 1
|
|
[14] .debug_pubtypes PROGBITS 0000000000000000 0005f5 000056 00 0 0 1
|
|
[15] .debug_frame PROGBITS 0000000000000000 000650 000028 00 0 0 8
|
|
[16] .debug_line PROGBITS 0000000000000000 000678 0000a7 00 0 0 1
|
|
[17] .symtab SYMTAB 0000000000000000 000720 000360 18 25 32 8
|
|
[18] .relsyscalls:sys_enter_openat REL 0000000000000000 000a80 000010 10 17 2 8
|
|
[19] .rel.debug_info REL 0000000000000000 000a90 000210 10 17 10 8
|
|
[20] .rel.debug_pubnames REL 0000000000000000 000ca0 000010 10 17 13 8
|
|
[21] .rel.debug_pubtypes REL 0000000000000000 000cb0 000010 10 17 14 8
|
|
[22] .rel.debug_frame REL 0000000000000000 000cc0 000020 10 17 15 8
|
|
[23] .rel.debug_line REL 0000000000000000 000ce0 000010 10 17 16 8
|
|
[24] .llvm_addrsig LOOS+0xfff4c03 0000000000000000 000cf0 000004 00 E 0 0 1
|
|
[25] .strtab STRTAB 0000000000000000 000cf4 00019c 00 0 0 1
|
|
[26] .BTF PROGBITS 0000000000000000 000e90 0001ea 00 0 0 1
|
|
Key to Flags:
|
|
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
|
|
L (link order), O (extra OS processing required), G (group), T (TLS),
|
|
C (compressed), x (unknown), o (OS specific), E (exclude),
|
|
p (processor specific)
|
|
readelf: tools/perf/examples/bpf/hello.o: Warning: possibly corrupt ELF header - it has a non-zero program header offset, but no program headers
|
|
[root@seventh perf]#
|
|
|
|
That new ".BTF" section should then be parseable by the kernel, that has a BTF
|
|
decoder, something not available for pahole at this time, but that will come in
|
|
a later version.
|
|
|
|
When pahole tries to read the DWARF info in that BPF ELF file, hello.o, we can se
|
|
a problem that will require us to add another option to the .perfconfig llvm section:
|
|
|
|
# pahole tools/perf/examples/bpf/hello.o
|
|
struct clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c) {
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566ec377 clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c); /* 0 4 */
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566ec377 clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c); /* 4 4 */
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566ec377 clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c); /* 8 4 */
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566ec377 clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c); /* 12 4 */
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566ec377 clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c); /* 16 4 */
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566ec377 clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c); /* 20 4 */
|
|
clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566ec377 clang version 8.0.0 (http://llvm.org/git/clang.git 8587270a739ee30c926a76d5657e65e85b560f6e) (http://llvm.org/git/llvm.git 0566eefef9c3777bd780ec4cbb9efa764633b76c); /* 24 4 */
|
|
|
|
/* size: 28, cachelines: 1, members: 7 */
|
|
/* last cacheline: 28 bytes */
|
|
};
|
|
#
|
|
|
|
We need to pass some options to llvm, via the llvm.opts variable in ~/.perfconfig:
|
|
|
|
[root@seventh perf]# cat ~/.perfconfig
|
|
[llvm]
|
|
dump-obj = true
|
|
clang-opt = -g
|
|
opts = -mattr=dwarfris
|
|
[root@seventh perf]# perf trace -e tools/perf/examples/bpf/hello.c cat /etc/passwd > /dev/null
|
|
LLVM: dumping tools/perf/examples/bpf/hello.o
|
|
0.000 __bpf_stdout__:Hello, world
|
|
0.018 __bpf_stdout__:Hello, world
|
|
0.209 __bpf_stdout__:Hello, world
|
|
[root@seventh perf]# pahole tools/perf/examples/bpf/hello.o
|
|
struct bpf_map {
|
|
unsigned int type; /* 0 4 */
|
|
unsigned int key_size; /* 4 4 */
|
|
unsigned int value_size; /* 8 4 */
|
|
unsigned int max_entries; /* 12 4 */
|
|
unsigned int map_flags; /* 16 4 */
|
|
unsigned int inner_map_idx; /* 20 4 */
|
|
unsigned int numa_node; /* 24 4 */
|
|
|
|
/* size: 28, cachelines: 1, members: 7 */
|
|
/* last cacheline: 28 bytes */
|
|
};
|
|
[root@seventh perf]#
|
|
|
|
This is not needed when using elfutils >= 0.173, pahole will just work as above.
|
|
|
|
Now we need to go test the kernel, and to load that file with a BTF section we
|
|
can also use perf, passing the .o file instead of the .c one, skipping the
|
|
compilation phase and using the modified .o file, we will also run in system
|
|
wide mode, so taht we can keep that BPF object loaded and attached to the
|
|
tracepoint, so that we can use the kernel facilities to inspect the BTF file as
|
|
read and processed by the kernel:
|
|
|
|
# perf trace -e tools/perf/examples/bpf/hello.c 2> /dev/null
|
|
|
|
Now to look if the kernel has the bpf filesystem:
|
|
|
|
[acme@jouet perf]$ grep bpf /proc/filesystems
|
|
nodev bpf
|
|
[acme@jouet perf]$
|
|
[root@jouet ~]# mount -t bpf nodev /sys/fs/bpf
|
|
[root@jouet ~]# mount | grep bpf
|
|
nodev on /sys/fs/bpf type bpf (rw,relatime)
|
|
[root@jouet ~]# cd /sys/fs/bpf
|
|
[root@jouet bpf]# ls -la
|
|
total 0
|
|
drwxrwxrwt. 2 root root 0 Aug 15 17:42 .
|
|
drwxr-xr-x. 10 root root 0 Aug 13 15:04 ..
|
|
[root@jouet bpf]#
|
|
|
|
Work is planned to allow using BTF info to pretty print from the bpf fs, see:
|
|
|
|
https://www.spinics.net/lists/netdev/msg518606.html
|
|
Date: Sat, 11 Aug 2018
|
|
|
|
<quote>
|
|
For bpftool, BTF pretty print support is missing
|
|
for per-cpu maps. bpffs print for per-cpu hash/array maps
|
|
need to be added as well. Will add them later.
|
|
|
|
Acked-by: Yonghong Song <yhs@xxxxxx>
|
|
</quote>
|
|
|
|
To see what libbpf and its users, like perf, does when a ".BTF" ELF section is
|
|
found in a BPF object being loaded via sys_bpf(), we can use 'perf ftrace' to
|
|
show the sequence of events inside the kernel to load, validade and initialize
|
|
data structures related to the request:
|
|
|
|
# perf ftrace -G *btf* perf trace -e tools/perf/examples/bpf/hello.o cat /etc/passwd
|
|
3) | bpf_btf_load() {
|
|
3) | capable() {
|
|
3) | ns_capable_common() {
|
|
3) | security_capable() {
|
|
3) 0.048 us | cap_capable();
|
|
3) | selinux_capable() {
|
|
3) 0.092 us | cred_has_capability();
|
|
3) 0.444 us | }
|
|
3) 1.387 us | }
|
|
3) 1.764 us | }
|
|
3) 2.168 us | }
|
|
3) | btf_new_fd() {
|
|
3) | kmem_cache_alloc_trace() {
|
|
3) | _cond_resched() {
|
|
3) 0.041 us | rcu_all_qs();
|
|
3) 0.407 us | }
|
|
3) 0.040 us | should_failslab();
|
|
3) 0.161 us | prefetch_freepointer();
|
|
3) 0.097 us | memcg_kmem_put_cache();
|
|
3) 2.719 us | }
|
|
3) | kmem_cache_alloc_trace() {
|
|
3) | _cond_resched() {
|
|
3) 0.040 us | rcu_all_qs();
|
|
3) 0.409 us | }
|
|
3) 0.040 us | should_failslab();
|
|
3) 0.110 us | prefetch_freepointer();
|
|
3) 0.099 us | memcg_kmem_put_cache();
|
|
3) 2.296 us | }
|
|
3) 0.054 us | bpf_check_uarg_tail_zero();
|
|
3) | __check_object_size() {
|
|
3) 0.152 us | __virt_addr_valid();
|
|
3) 0.047 us | __check_heap_object();
|
|
3) 0.040 us | check_stack_object();
|
|
3) 1.465 us | }
|
|
3) 0.041 us | btf_sec_info_cmp();
|
|
3) | kvmalloc_node() {
|
|
3) | __kmalloc_node() {
|
|
3) 0.051 us | kmalloc_slab();
|
|
3) | _cond_resched() {
|
|
3) 0.042 us | rcu_all_qs();
|
|
3) 0.401 us | }
|
|
3) 0.038 us | should_failslab();
|
|
3) 0.040 us | memcg_kmem_put_cache();
|
|
3) 2.168 us | }
|
|
3) 2.591 us | }
|
|
3) | __check_object_size() {
|
|
3) 0.108 us | __virt_addr_valid();
|
|
3) 0.050 us | __check_heap_object();
|
|
3) 0.039 us | check_stack_object();
|
|
3) 1.469 us | }
|
|
3) | btf_struct_check_meta() {
|
|
3) 0.057 us | __btf_verifier_log_type();
|
|
3) 0.057 us | btf_verifier_log_member();
|
|
3) 0.043 us | btf_verifier_log_member();
|
|
3) 0.042 us | btf_verifier_log_member();
|
|
3) 0.043 us | btf_verifier_log_member();
|
|
3) 0.043 us | btf_verifier_log_member();
|
|
3) | btf_verifier_log_member() {
|
|
3) ==========> |
|
|
3) | smp_irq_work_interrupt() {
|
|
3) | irq_enter() {
|
|
3) | rcu_irq_enter() {
|
|
3) 0.038 us | rcu_nmi_enter();
|
|
3) 0.412 us | }
|
|
3) 0.054 us | irqtime_account_irq();
|
|
3) 1.409 us | }
|
|
3) | __wake_up() {
|
|
3) | __wake_up_common_lock() {
|
|
3) 0.040 us | _raw_spin_lock_irqsave();
|
|
3) 0.051 us | __wake_up_common();
|
|
3) 0.044 us | _raw_spin_unlock_irqrestore();
|
|
3) 1.155 us | }
|
|
3) 1.508 us | }
|
|
3) | irq_exit() {
|
|
3) 0.062 us | irqtime_account_irq();
|
|
3) 0.038 us | idle_cpu();
|
|
3) | rcu_irq_exit() {
|
|
3) 0.038 us | rcu_nmi_exit();
|
|
3) 0.419 us | }
|
|
3) 1.601 us | }
|
|
3) 6.230 us | }
|
|
3) <========== |
|
|
3) 0.088 us | } /* btf_verifier_log_member */
|
|
3) 0.041 us | btf_verifier_log_member();
|
|
3) + 10.759 us | }
|
|
3) | kvmalloc_node() {
|
|
3) | __kmalloc_node() {
|
|
3) 0.043 us | kmalloc_slab();
|
|
3) | _cond_resched() {
|
|
3) 0.037 us | rcu_all_qs();
|
|
3) 0.455 us | }
|
|
3) 0.040 us | should_failslab();
|
|
3) 0.037 us | memcg_kmem_put_cache();
|
|
3) 2.227 us | }
|
|
3) 2.624 us | } /* kvmalloc_node */
|
|
3) | kvfree() {
|
|
3) 0.048 us | kfree();
|
|
3) 0.662 us | }
|
|
3) | btf_int_check_meta() {
|
|
3) 0.043 us | __btf_verifier_log_type();
|
|
3) 0.457 us | }
|
|
3) | btf_array_check_meta() {
|
|
3) 0.041 us | __btf_verifier_log_type();
|
|
3) 0.393 us | }
|
|
3) | btf_int_check_meta() {
|
|
3) 0.094 us | __btf_verifier_log_type();
|
|
3) 0.447 us | }
|
|
3) | btf_int_check_meta() {
|
|
3) 0.043 us | __btf_verifier_log_type();
|
|
3) 0.573 us | }
|
|
3) | btf_int_check_meta() {
|
|
3) 0.085 us | __btf_verifier_log_type();
|
|
3) 0.446 us | }
|
|
3) | btf_ref_type_check_meta() {
|
|
3) 0.042 us | __btf_verifier_log_type();
|
|
3) 0.451 us | }
|
|
3) | btf_ref_type_check_meta() {
|
|
3) 0.042 us | __btf_verifier_log_type();
|
|
3) 0.427 us | }
|
|
3) | btf_ref_type_check_meta() {
|
|
3) 0.042 us | __btf_verifier_log_type();
|
|
3) 0.397 us | }
|
|
3) | btf_ref_type_check_meta() {
|
|
3) 0.041 us | __btf_verifier_log_type();
|
|
3) 0.399 us | }
|
|
3) | btf_int_check_meta() {
|
|
3) 0.043 us | __btf_verifier_log_type();
|
|
3) 0.602 us | }
|
|
3) | btf_ref_type_check_meta() {
|
|
3) 0.040 us | __btf_verifier_log_type();
|
|
3) 0.733 us | }
|
|
3) | btf_array_check_meta() {
|
|
3) 0.094 us | __btf_verifier_log_type();
|
|
3) 0.452 us | }
|
|
3) | kvmalloc_node() {
|
|
3) | __kmalloc_node() {
|
|
3) 0.039 us | kmalloc_slab();
|
|
3) | _cond_resched() {
|
|
3) 0.041 us | rcu_all_qs();
|
|
3) 0.579 us | }
|
|
3) 0.039 us | should_failslab();
|
|
3) 0.042 us | memcg_kmem_put_cache();
|
|
3) 2.538 us | }
|
|
3) 2.886 us | }
|
|
3) | kvmalloc_node() {
|
|
3) | __kmalloc_node() {
|
|
3) 0.041 us | kmalloc_slab();
|
|
3) | _cond_resched() {
|
|
3) 0.038 us | rcu_all_qs();
|
|
3) 0.708 us | }
|
|
3) 0.038 us | should_failslab();
|
|
3) 0.040 us | memcg_kmem_put_cache();
|
|
3) 2.483 us | }
|
|
3) 2.829 us | }
|
|
3) | kvmalloc_node() {
|
|
3) | __kmalloc_node() {
|
|
3) 0.057 us | kmalloc_slab();
|
|
3) | _cond_resched() {
|
|
3) 0.040 us | rcu_all_qs();
|
|
3) 0.533 us | }
|
|
3) 0.039 us | should_failslab();
|
|
3) 0.038 us | memcg_kmem_put_cache();
|
|
3) 2.680 us | }
|
|
3) 3.171 us | }
|
|
3) 0.054 us | env_stack_push();
|
|
3) | btf_struct_resolve() {
|
|
3) 0.051 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.039 us | btf_int_check_member();
|
|
3) 0.039 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.039 us | btf_int_check_member();
|
|
3) 0.040 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.040 us | btf_int_check_member();
|
|
3) 0.039 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.099 us | btf_int_check_member();
|
|
3) 0.040 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.042 us | btf_int_check_member();
|
|
3) 0.040 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.038 us | btf_int_check_member();
|
|
3) 0.038 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.039 us | btf_int_check_member();
|
|
3) 6.545 us | }
|
|
3) 0.053 us | env_stack_push();
|
|
3) | btf_array_resolve() {
|
|
3) 0.039 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.090 us | btf_type_id_size();
|
|
3) 0.060 us | btf_type_int_is_regular();
|
|
3) 0.058 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.051 us | btf_type_id_size();
|
|
3) 0.055 us | btf_type_int_is_regular();
|
|
3) 3.414 us | }
|
|
3) 0.041 us | btf_type_id_size();
|
|
3) 0.057 us | env_stack_push();
|
|
3) | btf_ptr_resolve() {
|
|
3) 0.056 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.054 us | env_stack_push();
|
|
3) 1.056 us | }
|
|
3) 0.063 us | btf_ptr_resolve();
|
|
3) | btf_ptr_resolve() {
|
|
3) 0.049 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.086 us | btf_type_id_size();
|
|
3) 1.052 us | }
|
|
3) 0.045 us | env_stack_push();
|
|
3) 0.060 us | btf_ptr_resolve();
|
|
3) 0.045 us | env_stack_push();
|
|
3) | btf_ptr_resolve() {
|
|
3) 0.039 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.062 us | btf_type_id_size();
|
|
3) 1.325 us | }
|
|
3) 0.054 us | env_stack_push();
|
|
3) | btf_modifier_resolve() {
|
|
3) 0.061 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.043 us | btf_type_id_size();
|
|
3) 0.877 us | }
|
|
3) 0.052 us | env_stack_push();
|
|
3) | btf_array_resolve() {
|
|
3) 0.060 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.051 us | btf_type_id_size();
|
|
3) 0.042 us | btf_type_int_is_regular();
|
|
3) 0.040 us | env_type_is_resolve_sink.isra.19();
|
|
3) 0.042 us | btf_type_id_size();
|
|
3) 0.041 us | btf_type_int_is_regular();
|
|
3) 2.822 us | }
|
|
3) 0.048 us | btf_type_id_size();
|
|
3) | kvfree() {
|
|
3) 0.148 us | kfree();
|
|
3) 0.685 us | }
|
|
3) 0.287 us | kfree();
|
|
3) 0.042 us | _raw_spin_lock_bh();
|
|
3) | kmem_cache_alloc() {
|
|
3) 0.040 us | should_failslab();
|
|
3) 0.111 us | prefetch_freepointer();
|
|
3) 0.094 us | memcg_kmem_put_cache();
|
|
3) 2.139 us | }
|
|
3) | _raw_spin_unlock_bh() {
|
|
3) 0.079 us | __local_bh_enable_ip();
|
|
3) 0.460 us | }
|
|
3) | anon_inode_getfd() {
|
|
3) | get_unused_fd_flags() {
|
|
3) | __alloc_fd() {
|
|
3) 0.040 us | _raw_spin_lock();
|
|
3) 0.041 us | expand_files();
|
|
3) 1.374 us | }
|
|
3) 1.759 us | }
|
|
3) | anon_inode_getfile() {
|
|
3) | d_alloc_pseudo() {
|
|
3) | __d_alloc() {
|
|
3) | kmem_cache_alloc() {
|
|
3) | _cond_resched() {
|
|
3) 0.035 us | rcu_all_qs();
|
|
3) 0.507 us | }
|
|
3) 0.040 us | should_failslab();
|
|
3) | memcg_kmem_get_cache() {
|
|
3) 0.091 us | get_mem_cgroup_from_mm();
|
|
3) 0.633 us | }
|
|
3) 0.111 us | prefetch_freepointer();
|
|
3) 0.082 us | memcg_kmem_put_cache();
|
|
3) 4.178 us | }
|
|
3) 0.162 us | d_set_d_op();
|
|
3) 5.545 us | }
|
|
3) 6.270 us | }
|
|
3) 0.112 us | mntget();
|
|
3) 0.125 us | ihold();
|
|
3) | d_instantiate() {
|
|
3) 0.120 us | security_d_instantiate();
|
|
3) 0.106 us | _raw_spin_lock();
|
|
3) | __d_instantiate() {
|
|
3) 0.069 us | d_flags_for_inode();
|
|
3) 0.090 us | _raw_spin_lock();
|
|
3) 1.483 us | }
|
|
3) 2.767 us | }
|
|
3) | alloc_file() {
|
|
3) | get_empty_filp() {
|
|
3) | kmem_cache_alloc() {
|
|
3) | _cond_resched() {
|
|
3) 0.039 us | rcu_all_qs();
|
|
3)root:x:0:0:root:/root:/bin/bash
|
|
bin:x:1:1:bin:/bin:/sbin/nologin
|
|
daemon:x:2:2:daemon:/sbin:/sbin/nologin
|
|
adm:x:3:4:adm:/var/adm:/sbin/nologin
|
|
<SNIP rest of /proc/passwd contents>
|
|
0.382 us | }
|
|
3) 0.040 us | should_failslab();
|
|
3) | memcg_kmem_get_cache() {
|
|
3) 0.039 us | get_mem_cgroup_from_mm();
|
|
3) 0.626 us | }
|
|
3) 0.050 us | prefetch_freepointer();
|
|
3) 0.059 us | memcg_kmem_put_cache();
|
|
3) 3.280 us | }
|
|
3) | security_file_alloc() {
|
|
3) | selinux_file_alloc_security() {
|
|
3) | kmem_cache_alloc() {
|
|
3) | _cond_resched() {
|
|
3) 0.038 us | rcu_all_qs();
|
|
3) 0.422 us | }
|
|
3) 0.040 us | should_failslab();
|
|
3) 0.051 us | prefetch_freepointer();
|
|
3) 0.054 us | memcg_kmem_put_cache();
|
|
3) 2.660 us | }
|
|
3) 3.062 us | }
|
|
3) 3.548 us | }
|
|
3) 0.039 us | __mutex_init();
|
|
3) 8.091 us | }
|
|
3) 8.617 us | }
|
|
3) + 20.810 us | }
|
|
3) | fd_install() {
|
|
3) 0.054 us | __fd_install();
|
|
3) 0.723 us | }
|
|
3) + 24.438 us | }
|
|
3) ! 109.639 us | }
|
|
3) ! 112.925 us | }
|
|
3) | btf_release() {
|
|
3) | btf_put() {
|
|
3) 0.145 us | _raw_spin_lock_irqsave();
|
|
3) | call_rcu_sched() {
|
|
3) | __call_rcu() {
|
|
3) 0.082 us | rcu_segcblist_enqueue();
|
|
3) 1.323 us | }
|
|
3) 1.782 us | }
|
|
3) 0.069 us | _raw_spin_unlock_irqrestore();
|
|
3) | call_rcu_sched() {
|
|
3) | __call_rcu() {
|
|
3) 0.069 us | rcu_segcblist_enqueue();
|
|
3) 0.541 us | }
|
|
3) 0.984 us | }
|
|
3) 5.210 us | }
|
|
3) 5.954 us | }
|
|
|
|
This should be enough for us to validate pahole's BTF encoder, and now one can
|
|
use 'pahole -F btf' to obtain mostly the same results as with the default use
|
|
of '-F dwarf', modulo things like explicit alignments that are not present in
|
|
BTF and need some work to be inferred from existing non-natural alignment holes.
|
|
|
|
- Arnaldo
|