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253 lines
20 KiB
253 lines
20 KiB
7 months ago
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# BPF Compiler Collection (BCC)
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BCC is a toolkit for creating efficient kernel tracing and manipulation
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programs, and includes several useful tools and examples. It makes use of
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extended BPF (Berkeley Packet Filters), formally known as eBPF, a new feature
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that was first added to Linux 3.15. Much of what BCC uses requires Linux 4.1
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and above.
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eBPF was [described by](https://lkml.org/lkml/2015/4/14/232) Ingo Molnár as:
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> One of the more interesting features in this cycle is the ability to attach eBPF programs (user-defined, sandboxed bytecode executed by the kernel) to kprobes. This allows user-defined instrumentation on a live kernel image that can never crash, hang or interfere with the kernel negatively.
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BCC makes BPF programs easier to write, with kernel instrumentation in C
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(and includes a C wrapper around LLVM), and front-ends in Python and lua.
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It is suited for many tasks, including performance analysis and network
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traffic control.
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## Screenshot
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This example traces a disk I/O kernel function, and populates an in-kernel
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power-of-2 histogram of the I/O size. For efficiency, only the histogram
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summary is returned to user-level.
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```Shell
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# ./bitehist.py
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Tracing... Hit Ctrl-C to end.
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^C
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kbytes : count distribution
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0 -> 1 : 3 | |
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2 -> 3 : 0 | |
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4 -> 7 : 211 |********** |
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8 -> 15 : 0 | |
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16 -> 31 : 0 | |
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32 -> 63 : 0 | |
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64 -> 127 : 1 | |
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128 -> 255 : 800 |**************************************|
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```
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The above output shows a bimodal distribution, where the largest mode of
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800 I/O was between 128 and 255 Kbytes in size.
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See the source: [bitehist.py](examples/tracing/bitehist.py). What this traces,
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what this stores, and how the data is presented, can be entirely customized.
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This shows only some of many possible capabilities.
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## Installing
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See [INSTALL.md](INSTALL.md) for installation steps on your platform.
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## FAQ
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See [FAQ.txt](FAQ.txt) for the most common troubleshoot questions.
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## Reference guide
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See [docs/reference_guide.md](docs/reference_guide.md) for the reference guide to the bcc and bcc/BPF APIs.
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## Contents
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Some of these are single files that contain both C and Python, others have a
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pair of .c and .py files, and some are directories of files.
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### Tracing
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#### Examples:
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- examples/tracing/[bitehist.py](examples/tracing/bitehist.py): Block I/O size histogram. [Examples](examples/tracing/bitehist_example.txt).
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- examples/tracing/[disksnoop.py](examples/tracing/disksnoop.py): Trace block device I/O latency. [Examples](examples/tracing/disksnoop_example.txt).
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- examples/[hello_world.py](examples/hello_world.py): Prints "Hello, World!" for new processes.
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- examples/tracing/[mysqld_query.py](examples/tracing/mysqld_query.py): Trace MySQL server queries using USDT probes. [Examples](examples/tracing/mysqld_query_example.txt).
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- examples/tracing/[nodejs_http_server.py](examples/tracing/nodejs_http_server.py): Trace Node.js HTTP server requests using USDT probes. [Examples](examples/tracing/nodejs_http_server_example.txt).
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- examples/tracing/[stacksnoop](examples/tracing/stacksnoop.py): Trace a kernel function and print all kernel stack traces. [Examples](examples/tracing/stacksnoop_example.txt).
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- tools/[statsnoop](tools/statsnoop.py): Trace stat() syscalls. [Examples](tools/statsnoop_example.txt).
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- examples/tracing/[task_switch.py](examples/tracing/task_switch.py): Count task switches with from and to PIDs.
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- examples/tracing/[tcpv4connect.py](examples/tracing/tcpv4connect.py): Trace TCP IPv4 active connections. [Examples](examples/tracing/tcpv4connect_example.txt).
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- examples/tracing/[trace_fields.py](examples/tracing/trace_fields.py): Simple example of printing fields from traced events.
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- examples/tracing/[urandomread.py](examples/tracing/urandomread.py): A kernel tracepoint example, which traces random:urandom_read. [Examples](examples/tracing/urandomread_example.txt).
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- examples/tracing/[vfsreadlat.py](examples/tracing/vfsreadlat.py) examples/tracing/[vfsreadlat.c](examples/tracing/vfsreadlat.c): VFS read latency distribution. [Examples](examples/tracing/vfsreadlat_example.txt).
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- examples/tracing/[kvm_hypercall.py](examples/tracing/kvm_hypercall.py): Conditional static kernel tracepoints for KVM entry, exit and hypercall [Examples](examples/tracing/kvm_hypercall.txt).
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#### Tools:
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<center><a href="images/bcc_tracing_tools_2017.png"><img src="images/bcc_tracing_tools_2017.png" border=0 width=700></a></center>
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- tools/[argdist](tools/argdist.py): Display function parameter values as a histogram or frequency count. [Examples](tools/argdist_example.txt).
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- tools/[bashreadline](tools/bashreadline.py): Print entered bash commands system wide. [Examples](tools/bashreadline_example.txt).
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- tools/[biolatency](tools/biolatency.py): Summarize block device I/O latency as a histogram. [Examples](tools/biolatency_example.txt).
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- tools/[biotop](tools/biotop.py): Top for disks: Summarize block device I/O by process. [Examples](tools/biotop_example.txt).
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- tools/[biosnoop](tools/biosnoop.py): Trace block device I/O with PID and latency. [Examples](tools/biosnoop_example.txt).
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- tools/[bitesize](tools/bitesize.py): Show per process I/O size histogram. [Examples](tools/bitesize_example.txt).
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- tools/[bpflist](tools/bpflist.py): Display processes with active BPF programs and maps. [Examples](tools/bpflist_example.txt).
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- tools/[btrfsdist](tools/btrfsdist.py): Summarize btrfs operation latency distribution as a histogram. [Examples](tools/btrfsdist_example.txt).
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- tools/[btrfsslower](tools/btrfsslower.py): Trace slow btrfs operations. [Examples](tools/btrfsslower_example.txt).
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- tools/[capable](tools/capable.py): Trace security capability checks. [Examples](tools/capable_example.txt).
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- tools/[cachestat](tools/cachestat.py): Trace page cache hit/miss ratio. [Examples](tools/cachestat_example.txt).
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- tools/[cachetop](tools/cachetop.py): Trace page cache hit/miss ratio by processes. [Examples](tools/cachetop_example.txt).
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- tools/[cpudist](tools/cpudist.py): Summarize on- and off-CPU time per task as a histogram. [Examples](tools/cpudist_example.txt)
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- tools/[cpuunclaimed](tools/cpuunclaimed.py): Sample CPU run queues and calculate unclaimed idle CPU. [Examples](tools/cpuunclaimed_example.txt)
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- tools/[criticalstat](tools/criticalstat.py): Trace and report long atomic critical sections in the kernel. [Examples](tools/criticalstat_example.txt)
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- tools/[dbslower](tools/dbslower.py): Trace MySQL/PostgreSQL queries slower than a threshold. [Examples](tools/dbslower_example.txt).
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- tools/[dbstat](tools/dbstat.py): Summarize MySQL/PostgreSQL query latency as a histogram. [Examples](tools/dbstat_example.txt).
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- tools/[dcsnoop](tools/dcsnoop.py): Trace directory entry cache (dcache) lookups. [Examples](tools/dcsnoop_example.txt).
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- tools/[dcstat](tools/dcstat.py): Directory entry cache (dcache) stats. [Examples](tools/dcstat_example.txt).
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- tools/[deadlock_detector](tools/deadlock_detector.py): Detect potential deadlocks on a running process. [Examples](tools/deadlock_detector_example.txt).
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- tools/[execsnoop](tools/execsnoop.py): Trace new processes via exec() syscalls. [Examples](tools/execsnoop_example.txt).
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- tools/[ext4dist](tools/ext4dist.py): Summarize ext4 operation latency distribution as a histogram. [Examples](tools/ext4dist_example.txt).
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- tools/[ext4slower](tools/ext4slower.py): Trace slow ext4 operations. [Examples](tools/ext4slower_example.txt).
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- tools/[filelife](tools/filelife.py): Trace the lifespan of short-lived files. [Examples](tools/filelife_example.txt).
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- tools/[fileslower](tools/fileslower.py): Trace slow synchronous file reads and writes. [Examples](tools/fileslower_example.txt).
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- tools/[filetop](tools/filetop.py): File reads and writes by filename and process. Top for files. [Examples](tools/filetop_example.txt).
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- tools/[funccount](tools/funccount.py): Count kernel function calls. [Examples](tools/funccount_example.txt).
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- tools/[funclatency](tools/funclatency.py): Time functions and show their latency distribution. [Examples](tools/funclatency_example.txt).
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- tools/[funcslower](tools/funcslower.py): Trace slow kernel or user function calls. [Examples](tools/funcslower_example.txt).
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- tools/[gethostlatency](tools/gethostlatency.py): Show latency for getaddrinfo/gethostbyname[2] calls. [Examples](tools/gethostlatency_example.txt).
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- tools/[hardirqs](tools/hardirqs.py): Measure hard IRQ (hard interrupt) event time. [Examples](tools/hardirqs_example.txt).
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- tools/[inject](tools/inject.py): Targeted error injection with call chain and predicates [Examples](tools/inject_example.txt).
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- tools/[killsnoop](tools/killsnoop.py): Trace signals issued by the kill() syscall. [Examples](tools/killsnoop_example.txt).
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- tools/[llcstat](tools/llcstat.py): Summarize CPU cache references and misses by process. [Examples](tools/llcstat_example.txt).
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- tools/[mdflush](tools/mdflush.py): Trace md flush events. [Examples](tools/mdflush_example.txt).
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- tools/[mysqld_qslower](tools/mysqld_qslower.py): Trace MySQL server queries slower than a threshold. [Examples](tools/mysqld_qslower_example.txt).
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- tools/[memleak](tools/memleak.py): Display outstanding memory allocations to find memory leaks. [Examples](tools/memleak_example.txt).
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- tools/[nfsslower](tools/nfsslower.py): Trace slow NFS operations. [Examples](tools/nfsslower_example.txt).
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- tools/[nfsdist](tools/nfsdist.py): Summarize NFS operation latency distribution as a histogram. [Examples](tools/nfsdist_example.txt).
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- tools/[offcputime](tools/offcputime.py): Summarize off-CPU time by kernel stack trace. [Examples](tools/offcputime_example.txt).
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- tools/[offwaketime](tools/offwaketime.py): Summarize blocked time by kernel off-CPU stack and waker stack. [Examples](tools/offwaketime_example.txt).
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- tools/[oomkill](tools/oomkill.py): Trace the out-of-memory (OOM) killer. [Examples](tools/oomkill_example.txt).
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- tools/[opensnoop](tools/opensnoop.py): Trace open() syscalls. [Examples](tools/opensnoop_example.txt).
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- tools/[pidpersec](tools/pidpersec.py): Count new processes (via fork). [Examples](tools/pidpersec_example.txt).
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- tools/[profile](tools/profile.py): Profile CPU usage by sampling stack traces at a timed interval. [Examples](tools/profile_example.txt).
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- tools/[reset-trace](tools/reset-trace.sh): Reset the state of tracing. Maintenance tool only. [Examples](tools/reset-trace_example.txt).
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- tools/[runqlat](tools/runqlat.py): Run queue (scheduler) latency as a histogram. [Examples](tools/runqlat_example.txt).
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- tools/[runqlen](tools/runqlen.py): Run queue length as a histogram. [Examples](tools/runqlen_example.txt).
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- tools/[runqslower](tools/runqslower.py): Trace long process scheduling delays. [Examples](tools/runqslower_example.txt).
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- tools/[shmsnoop](tools/shmsnoop.py): Trace System V shared memory syscalls. [Examples](tools/shmsnoop_example.txt).
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- tools/[sofdsnoop](tools/sofdsnoop.py): Trace FDs passed through unix sockets. [Examples](tools/sofdsnoop_example.txt).
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- tools/[slabratetop](tools/slabratetop.py): Kernel SLAB/SLUB memory cache allocation rate top. [Examples](tools/slabratetop_example.txt).
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- tools/[softirqs](tools/softirqs.py): Measure soft IRQ (soft interrupt) event time. [Examples](tools/softirqs_example.txt).
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- tools/[solisten](tools/solisten.py): Trace TCP socket listen. [Examples](tools/solisten_example.txt).
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- tools/[sslsniff](tools/sslsniff.py): Sniff OpenSSL written and readed data. [Examples](tools/sslsniff_example.txt).
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- tools/[stackcount](tools/stackcount.py): Count kernel function calls and their stack traces. [Examples](tools/stackcount_example.txt).
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- tools/[syncsnoop](tools/syncsnoop.py): Trace sync() syscall. [Examples](tools/syncsnoop_example.txt).
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- tools/[syscount](tools/syscount.py): Summarize syscall counts and latencies. [Examples](tools/syscount_example.txt).
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- tools/[tcpaccept](tools/tcpaccept.py): Trace TCP passive connections (accept()). [Examples](tools/tcpaccept_example.txt).
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- tools/[tcpconnect](tools/tcpconnect.py): Trace TCP active connections (connect()). [Examples](tools/tcpconnect_example.txt).
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- tools/[tcpconnlat](tools/tcpconnlat.py): Trace TCP active connection latency (connect()). [Examples](tools/tcpconnlat_example.txt).
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- tools/[tcpdrop](tools/tcpdrop.py): Trace kernel-based TCP packet drops with details. [Examples](tools/tcpdrop_example.txt).
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- tools/[tcplife](tools/tcplife.py): Trace TCP sessions and summarize lifespan. [Examples](tools/tcplife_example.txt).
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- tools/[tcpretrans](tools/tcpretrans.py): Trace TCP retransmits and TLPs. [Examples](tools/tcpretrans_example.txt).
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- tools/[tcpstates](tools/tcpstates.py): Trace TCP session state changes with durations. [Examples](tools/tcpstates_example.txt).
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- tools/[tcpsubnet](tools/tcpsubnet.py): Summarize and aggregate TCP send by subnet. [Examples](tools/tcpsubnet_example.txt).
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- tools/[tcptop](tools/tcptop.py): Summarize TCP send/recv throughput by host. Top for TCP. [Examples](tools/tcptop_example.txt).
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- tools/[tcptracer](tools/tcptracer.py): Trace TCP established connections (connect(), accept(), close()). [Examples](tools/tcptracer_example.txt).
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- tools/[tplist](tools/tplist.py): Display kernel tracepoints or USDT probes and their formats. [Examples](tools/tplist_example.txt).
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- tools/[trace](tools/trace.py): Trace arbitrary functions, with filters. [Examples](tools/trace_example.txt).
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- tools/[ttysnoop](tools/ttysnoop.py): Watch live output from a tty or pts device. [Examples](tools/ttysnoop_example.txt).
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- tools/[ucalls](tools/lib/ucalls.py): Summarize method calls or Linux syscalls in high-level languages. [Examples](tools/lib/ucalls_example.txt).
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- tools/[uflow](tools/lib/uflow.py): Print a method flow graph in high-level languages. [Examples](tools/lib/uflow_example.txt).
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- tools/[ugc](tools/lib/ugc.py): Trace garbage collection events in high-level languages. [Examples](tools/lib/ugc_example.txt).
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- tools/[uobjnew](tools/lib/uobjnew.py): Summarize object allocation events by object type and number of bytes allocated. [Examples](tools/lib/uobjnew_example.txt).
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- tools/[ustat](tools/lib/ustat.py): Collect events such as GCs, thread creations, object allocations, exceptions and more in high-level languages. [Examples](tools/lib/ustat_example.txt).
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- tools/[uthreads](tools/lib/uthreads.py): Trace thread creation events in Java and raw pthreads. [Examples](tools/lib/uthreads_example.txt).
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- tools/[vfscount](tools/vfscount.py) tools/[vfscount.c](tools/vfscount.c): Count VFS calls. [Examples](tools/vfscount_example.txt).
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- tools/[vfsstat](tools/vfsstat.py) tools/[vfsstat.c](tools/vfsstat.c): Count some VFS calls, with column output. [Examples](tools/vfsstat_example.txt).
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- tools/[wakeuptime](tools/wakeuptime.py): Summarize sleep to wakeup time by waker kernel stack. [Examples](tools/wakeuptime_example.txt).
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- tools/[xfsdist](tools/xfsdist.py): Summarize XFS operation latency distribution as a histogram. [Examples](tools/xfsdist_example.txt).
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- tools/[xfsslower](tools/xfsslower.py): Trace slow XFS operations. [Examples](tools/xfsslower_example.txt).
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- tools/[zfsdist](tools/zfsdist.py): Summarize ZFS operation latency distribution as a histogram. [Examples](tools/zfsdist_example.txt).
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- tools/[zfsslower](tools/zfsslower.py): Trace slow ZFS operations. [Examples](tools/zfsslower_example.txt).
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### Networking
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Examples:
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- examples/networking/[distributed_bridge/](examples/networking/distributed_bridge): Distributed bridge example.
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- examples/networking/[http_filter/](examples/networking/http_filter): Simple HTTP filter example.
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- examples/networking/[simple_tc.py](examples/networking/simple_tc.py): Simple traffic control example.
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- examples/networking/[simulation.py](examples/networking/simulation.py): Simulation helper.
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- examples/networking/neighbor_sharing/[tc_neighbor_sharing.py](examples/networking/neighbor_sharing/tc_neighbor_sharing.py) examples/networking/neighbor_sharing/[tc_neighbor_sharing.c](examples/networking/neighbor_sharing/tc_neighbor_sharing.c): Per-IP classification and rate limiting.
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- examples/networking/[tunnel_monitor/](examples/networking/tunnel_monitor): Efficiently monitor traffic flows. [Example video](https://www.youtube.com/watch?v=yYy3Cwce02k).
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- examples/networking/vlan_learning/[vlan_learning.py](examples/networking/vlan_learning/vlan_learning.py) examples/[vlan_learning.c](examples/networking/vlan_learning/vlan_learning.c): Demux Ethernet traffic into worker veth+namespaces.
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### BPF Introspection:
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Tools that help to introspect BPF programs.
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- introspection/[bps.c](introspection/bps.c): List all BPF programs loaded into the kernel. 'ps' for BPF programs. [Examples](introspection/bps_example.txt).
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## Motivation
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BPF guarantees that the programs loaded into the kernel cannot crash, and
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cannot run forever, but yet BPF is general purpose enough to perform many
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arbitrary types of computation. Currently, it is possible to write a program in
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C that will compile into a valid BPF program, yet it is vastly easier to
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write a C program that will compile into invalid BPF (C is like that). The user
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won't know until trying to run the program whether it was valid or not.
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With a BPF-specific frontend, one should be able to write in a language and
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receive feedback from the compiler on the validity as it pertains to a BPF
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backend. This toolkit aims to provide a frontend that can only create valid BPF
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programs while still harnessing its full flexibility.
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Furthermore, current integrations with BPF have a kludgy workflow, sometimes
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involving compiling directly in a linux kernel source tree. This toolchain aims
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to minimize the time that a developer spends getting BPF compiled, and instead
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focus on the applications that can be written and the problems that can be
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solved with BPF.
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The features of this toolkit include:
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* End-to-end BPF workflow in a shared library
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* A modified C language for BPF backends
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* Integration with llvm-bpf backend for JIT
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* Dynamic (un)loading of JITed programs
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* Support for BPF kernel hooks: socket filters, tc classifiers,
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tc actions, and kprobes
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* Bindings for Python
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* Examples for socket filters, tc classifiers, and kprobes
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* Self-contained tools for tracing a running system
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|
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In the future, more bindings besides python will likely be supported. Feel free
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to add support for the language of your choice and send a pull request!
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## Tutorials
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||
|
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||
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- [docs/tutorial.md](docs/tutorial.md): Using bcc tools to solve performance, troubleshooting, and networking issues.
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|
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- [docs/tutorial_bcc_python_developer.md](docs/tutorial_bcc_python_developer.md): Developing new bcc programs using the Python interface.
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|
|
|
||
|
|
### Networking
|
||
|
|
|
||
|
|
At Red Hat Summit 2015, BCC was presented as part of a [session on BPF](http://www.devnation.org/#7784f1f7513e8542e4db519e79ff5eec).
|
||
|
|
A multi-host vxlan environment is simulated and a BPF program used to monitor
|
||
|
|
one of the physical interfaces. The BPF program keeps statistics on the inner
|
||
|
|
and outer IP addresses traversing the interface, and the userspace component
|
||
|
|
turns those statistics into a graph showing the traffic distribution at
|
||
|
|
multiple granularities. See the code [here](examples/networking/tunnel_monitor).
|
||
|
|
|
||
|
|
[](https://youtu.be/yYy3Cwce02k)
|
||
|
|
|
||
|
|
## Contributing
|
||
|
|
|
||
|
|
Already pumped up to commit some code? Here are some resources to join the
|
||
|
|
discussions in the [IOVisor](https://www.iovisor.org/) community and see
|
||
|
|
what you want to work on.
|
||
|
|
|
||
|
|
* _Mailing List:_ http://lists.iovisor.org/mailman/listinfo/iovisor-dev
|
||
|
|
* _IRC:_ #iovisor at irc.oftc.net
|
||
|
|
* _BCC Issue Tracker:_ [Github Issues](https://github.com/iovisor/bcc/issues)
|
||
|
|
* _A guide for contributing scripts:_ [CONTRIBUTING-SCRIPTS.md](CONTRIBUTING-SCRIPTS.md)
|
||
|
|
|
||
|
|
## External links
|
||
|
|
|
||
|
|
Looking for more information on BCC and how it's being used? You can find links to other BCC content on the web in [LINKS.md](LINKS.md).
|