linuxdebug/tools/perf/Documentation/guestmount.txt

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--guestmount=<path>::
Guest OS root file system mount directory. Users mount guest OS
root directories under <path> by a specific filesystem access method,
typically, sshfs.
For example, start 2 guest OS, one's pid is 8888 and the other's is 9999:
[verse]
$ mkdir \~/guestmount
$ cd \~/guestmount
$ sshfs -o allow_other,direct_io -p 5551 localhost:/ 8888/
$ sshfs -o allow_other,direct_io -p 5552 localhost:/ 9999/
$ perf {GMEXAMPLECMD} --guestmount=~/guestmount {GMEXAMPLESUBCMD}