bcc-shmsnoop man page

shmsnoop ā€” Trace System V shared memory syscalls. Uses Linux eBPF/bcc.

Synopsis

shmsnoop [-h] [-T] [-p] [-t] [-d DURATION] [-n NAME]

Description

shmsnoop traces System V shared memory syscalls: shmget, shmat, shmdt, shmctl

Since this uses BPF, only the root user can use this tool.

Requirements

CONFIG_BPF and bcc.

Options

-h

Print usage message.

-T

Include a timestamp column.

-p PID

Trace this process ID only (filtered in-kernel).

-t TID

Trace this thread ID only (filtered in-kernel).

-d DURATION

Total duration of trace in seconds.

-n NAME

Only print command lines matching this command name (regex)

Examples

Trace all shm* syscalls:

# shmsnoop

Trace all shm* syscalls, and include timestamps:

# shmsnoop -T

Only trace shm* syscalls where the process contains "server":

# shmsnoop -n server

Fields

TIME(s)

Time of shm syscall return, in seconds.

PID

Process ID

COMM

Parent process/command name.

RET

Return value of shm syscall.

ARGS

"arg: value" couples that represent given syscall arguments as described in their manpage

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

Jiri Olsa

See Also

opensnoop(1)

Info

2018-09-24 USER COMMANDS