Man page - hardirqs-bpfcc(8)
Packages contas this manual
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- profile-bpfcc(8)
- bpflist-bpfcc(8)
- statsnoop-bpfcc(8)
- inject-bpfcc(8)
- stackcount-bpfcc(8)
- pythonflow-bpfcc(8)
- perlstat-bpfcc(8)
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- filegone-bpfcc(8)
- kvmexit-bpfcc(8)
- javathreads-bpfcc(8)
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- nfsdist-bpfcc(8)
- oomkill-bpfcc(8)
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- rubygc-bpfcc(8)
- runqslower-bpfcc(8)
- rdmaucma-bpfcc(8)
- reset-trace-bpfcc(8)
- dbslower-bpfcc(8)
- ustat(8)
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- vfsstat-bpfcc(8)
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- llcstat-bpfcc(8)
- netqtop-bpfcc(8)
- javagc-bpfcc(8)
- syscount-bpfcc(8)
- cthreads-bpfcc(8)
- filelife-bpfcc(8)
- biolatpcts-bpfcc(8)
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- zfsslower-bpfcc(8)
- xfsdist-bpfcc(8)
- dcsnoop-bpfcc(8)
- tcpaccept-bpfcc(8)
- syncsnoop-bpfcc(8)
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- tclstat-bpfcc(8)
- cpuunclaimed-bpfcc(8)
- mysqld_qslower-bpfcc(8)
- filetop-bpfcc(8)
- funcinterval-bpfcc(8)
- tcpconnlat-bpfcc(8)
- uobjnew(8)
- uthreads(8)
- runqlat-bpfcc(8)
- sofdsnoop-bpfcc(8)
- readahead-bpfcc(8)
- memleak-bpfcc(8)
- tcpsynbl-bpfcc(8)
- biotop-bpfcc(8)
- fileslower-bpfcc(8)
- uflow(8)
- tcpdrop-bpfcc(8)
- phpcalls-bpfcc(8)
- killsnoop-bpfcc(8)
- cachetop-bpfcc(8)
- ugc(8)
- f2fsslower-bpfcc(8)
- softirqs-bpfcc(8)
- bashreadline-bpfcc(8)
- pythoncalls-bpfcc(8)
- tclcalls-bpfcc(8)
- perlflow-bpfcc(8)
- compactsnoop-bpfcc(8)
- ppchcalls-bpfcc(8)
- tplist-bpfcc(8)
- solisten-bpfcc(8)
- exitsnoop-bpfcc(8)
- funcslower-bpfcc(8)
- sslsniff-bpfcc(8)
- offwaketime-bpfcc(8)
- perlcalls-bpfcc(8)
- nfsslower-bpfcc(8)
- xfsslower-bpfcc(8)
- javacalls-bpfcc(8)
- tcptop-bpfcc(8)
- hardirqs-bpfcc(8)
- ext4slower-bpfcc(8)
apt-get install bpfcc-tools
Manual
| hardirqs(8) | System Manager's Manual | hardirqs(8) |
NAME
hardirqs - Measure hard IRQ (hard interrupt) event time. Uses Linux eBPF/bcc.
SYNOPSIS
hardirqs [-h] [-T] [-N] [-C] [-d] [interval] [outputs]
DESCRIPTION
This summarizes the time spent servicing hard IRQs (hard interrupts), and can show this time as either totals or histogram distributions. A system-wide summary of this time is shown by the %irq column of mpstat(1), and event counts (but not times) are shown by /proc/interrupts.
This tool uses the irq:irq_handler_entry and irq:irq_handler_exit kernel tracepoints, which is a stable tracing mechanism. BPF programs can attach to tracepoints from Linux 4.7 only. An older version of this tool is available in tools/old, and uses kprobes instead of tracepoints.
Since this uses BPF, only the root user can use this tool.
REQUIREMENTS
CONFIG_BPF and bcc.
OPTIONS
EXAMPLES
- Sum hard IRQ event time until Ctrl-C:
- # hardirqs
- Show hard IRQ event time as histograms:
- # hardirqs -d
- Print 1 second summaries, 10 times:
- # hardirqs 1 10
- 1 second summaries, printed in nanoseconds, with timestamps:
- # hardirqs -NT 1
- Sum hard IRQ event time on CPU 1 until Ctrl-C:
- # hardirqs -c 1
FIELDS
- HARDIRQ
- The irq action name for this hard IRQ.
- TOTAL_usecs
- Total time spent in this hard IRQ in microseconds.
- TOTAL_nsecs
- Total time spent in this hard IRQ in nanoseconds.
- usecs
- Range of microseconds for this bucket.
- nsecs
- Range of nanoseconds for this bucket.
- count
- Number of hard IRQs in this time range.
- distribution
- ASCII representation of the distribution (the count column).
OVERHEAD
This traces kernel functions and maintains in-kernel counts, which are asynchronously copied to user-space. While the rate of interrupts be very high (>1M/sec), this is a relatively efficient way to trace these events, and so the overhead is expected to be small for normal workloads, but could become noticeable for heavy workloads. Measure in a test environment before use.
SOURCE
This is from bcc.
- https://github.com/iovisor/bcc
Also look in the bcc distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.
OS
Linux
STABILITY
Unstable - in development.
AUTHOR
Brendan Gregg, Hengqi Chen, Rocky Xing
SEE ALSO
softirqs(8)
| 2015-10-20 | USER COMMANDS |