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tools: fix vfscount output when no duration is specified #2483

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Aug 5, 2019
Merged

tools: fix vfscount output when no duration is specified #2483

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6 changes: 5 additions & 1 deletion man/man8/vfscount.8
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
.SH NAME
vfscount \- Count VFS calls ("vfs_*"). Uses Linux eBPF/bcc.
.SH SYNOPSIS
.B vfscount
.B vfscount [duration]
.SH DESCRIPTION
This counts VFS calls. This can be useful for general workload
characterization of these operations.
Expand All @@ -14,6 +14,10 @@ Edit the script to customize which functions to trace.
Since this uses BPF, only the root user can use this tool.
.SH REQUIREMENTS
CONFIG_BPF and bcc.
.SH OPTIONS
.TP
duration
duration of the trace in seconds.
.SH EXAMPLES
.TP
Count some VFS calls until Ctrl-C is hit:
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1 change: 0 additions & 1 deletion tools/vfscount.py
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Expand Up @@ -54,7 +54,6 @@ def usage():
sleep(interval)
except KeyboardInterrupt:
pass
exit()

print("\n%-16s %-26s %8s" % ("ADDR", "FUNC", "COUNT"))
counts = b.get_table("counts")
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