bionic (8) filelife-bpfcc.8.gz

NAME

       filelife - Trace the lifespan of short-lived files. Uses Linux eBPF/bcc.

SYNOPSIS

       filelife [-h] [-p PID]

DESCRIPTION

       This  traces  the creation and deletion of files, providing information on who deleted the file, the file
       age, and the file name. The intent is to provide information  on  short-lived  files,  for  debugging  or
       performance analysis.

       This works by tracing the kernel vfs_create() and vfs_delete() functions (and maybe more, see the source)
       using dynamic tracing, and will need updating to match any changes to these functions.

       This makes use of a Linux 4.5 feature (bpf_perf_event_output()); for kernels  older  than  4.5,  see  the
       version under tools/old, which uses an older mechanism.

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

REQUIREMENTS

       CONFIG_BPF and bcc.

OPTIONS

       -h     Print usage message.

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

EXAMPLES

       Trace all short-lived files, and print details:
              # filelife

       Trace all short-lived files created AND deleted by PID 181:
              # filelife -p 181

FIELDS

       TIME   Time of the deletion.

       PID    Process ID that deleted the file.

       COMM   Process name for the PID.

       AGE(s) Age of the file, from creation to deletion, in seconds.

       FILE   Filename.

OVERHEAD

       This  traces  the  kernel  VFS file create and delete functions and prints output for each delete. As the
       rate of this is generally expected to be low (< 1000/s), the overhead is also expected to be  negligible.
       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

SEE ALSO

       opensnoop(1)