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-Using perf
-==========
-
-Top::
-
-  sudo perf top -p `pidof ceph-osd`
-
-To capture some data with call graphs::
-
-  sudo perf record -p `pidof ceph-osd` -F 99 --call-graph dwarf -- sleep 60
-
-To view by caller (where you can see what each top function calls)::
-
-  sudo perf report --call-graph caller
-
-To view by callee (where you can see who calls each top function)::  
-
-  sudo perf report --call-graph callee
-
-:note: If the caller/callee views look the same you may be
-       suffering from a kernel bug; upgrade to 4.8 or later.
-
-Flamegraphs
------------
-
-First, get things set up::
-
-  cd ~/src
-  git clone https://github.com/brendangregg/FlameGraph
-
-Run ceph, then record some perf data::
-
-  sudo perf record -p `pidof ceph-osd` -F 99 --call-graph dwarf -- sleep 60
-
-Then generate the flamegraph::
-
-  sudo perf script | ~/src/FlameGraph/stackcollapse-perf.pl > /tmp/folded
-  ~/src/FlameGraph/flamegraph.pl /tmp/folded > /tmp/perf.svg
-  firefox /tmp/perf.svg