Commit a26ca7c982cb ("bpf: btf: Add pretty print support to the
basic arraymap") and Commit 699c86d6ec21 ("bpf: btf: add pretty print
for hash/lru_hash maps") added bpffs pretty print for array, hash and
lru hash maps. The pretty print gives users a structurally formatted
dump for keys/values which much easy to understand than raw bytes.
This patch set implemented bpffs pretty print support for
percpu arraymap, percpu hashmap and percpu lru hashmap.
For complex key/value types, the pretty print here is even more useful
due to
. large volumne of data making it even harder to correlate bytes
to a particular field in a particular cpu.
. kernel rounds the value size for each cpu to multiple of 8.
User has to be aware of this otherwise wrong value may be
derived from cpu 1/2/...
For example, we may have a bpffs pretty print like below:
43602: {
cpu0:
{43602,0,-43602,0x3,0xaa52,0x3,{43602|[82,170,0,0,0,0,0,0]},ENUM_TWO}
cpu1:
{43602,0,-43602,0x3,0xaa52,0x3,{43602|[82,170,0,0,0,0,0,0]},ENUM_TWO}
cpu2:
{43602,0,-43602,0x3,0xaa52,0x3,{43602|[82,170,0,0,0,0,0,0]},ENUM_TWO}
cpu3:
{43602,0,-43602,0x3,0xaa52,0x3,{43602|[82,170,0,0,0,0,0,0]},ENUM_TWO}
}
for a percpu map.
This patch also added percpu formatted print on bpftool. For example,
bpftool may print like below:
{
"key": 0,
"values": [{
"cpu": 0,
"value": {
"ui32": 0,
"ui16": 0,
}
},{
"cpu": 1,
"value": {
"ui32": 1,
"ui16": 0,
}
},{
"cpu": 2,
"value": {
"ui32": 2,
"ui16": 0,
}
},{
"cpu": 3,
"value": {
"ui32": 3,
"ui16": 0,
}
}
]
}
Patch #1 implemented bpffs pretty print for percpu arraymap/hash/lru_hash
in kernel. Patch #2 added the test case in tools bpf selftest test_btf.
Patch #3 added percpu map btf based dump.
Yonghong Song (3):
bpf: add bpffs pretty print for percpu arraymap/hash/lru_hash
tools/bpf: add bpffs percpu map pretty print tests in test_btf
tools/bpf: bpftool: add btf percpu map formated dump
kernel/bpf/arraymap.c | 24 +++++
kernel/bpf/hashtab.c | 31 ++++++
tools/bpf/bpftool/map.c | 33 +++++-
tools/testing/selftests/bpf/test_btf.c | 179 ++++++++++++++++++++++++++-------
4 files changed, 230 insertions(+), 37 deletions(-)
--
2.14.3
