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Commit f1fb4cd8 authored by Brendan Gregg's avatar Brendan Gregg
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add dynamic tracing warning

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man/man8/biosnoop.8
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...@@ -12,6 +12,9 @@ the I/O was first created (which usually identifies the responsible process). ...@@ -12,6 +12,9 @@ the I/O was first created (which usually identifies the responsible process).
This uses in-kernel eBPF maps to cache process details (PID and comm) by I/O This uses in-kernel eBPF maps to cache process details (PID and comm) by I/O
request, as well as a starting timestamp for calculating I/O latency. request, as well as a starting timestamp for calculating I/O latency.
This works by tracing various kernel blk_*() functions using dynamic tracing,
and will need updating to match any changes to these functions.
Since this uses BPF, only the root user can use this tool. Since this uses BPF, only the root user can use this tool.
.SH REQUIREMENTS .SH REQUIREMENTS
CONFIG_BPF and bcc. CONFIG_BPF and bcc.
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