runc do not have /proc/pid

[zdyj3170101136]

i find runc process do not have /proc/pid file.

so how should i get the address mapping of it?

[g0dA]

you want to get runc's /proc/pid/maps?

maybe you can do this：

1. runc create CONTAINER
2. runc exec -t CONTAINER bash
3. cat /proc/1/maps

If you want to get this information on the host，you can find runc init by ps xf -o pid,ppid,args，you will get the host PID of runc

[zdyj3170101136]

ps xf -o pid,ppid,args

when i use perf record.
i find there are lot's of runc program:

runc 153973 [017] 8540402.979679:     250000 cpu-clock:
            5612bcbbd460 syscall.Syscall+0x30 (/usr/bin/runc)
            5612bcbd2b73 internal/poll.(*FD).Read+0x133 (/usr/bin/runc)
            5612bcbd9ee2 os.(*File).Read+0x72 (/usr/bin/runc)
            5612bcc382e6 bufio.(*Scanner).Scan+0xa6 (/usr/bin/runc)
            5612bcccb87c github.com/opencontainers/runc/libcontainer/intelrdt.findIntelRdtMountpointDir+0x13c (/usr/bin/runc)
            5612bcccbe68 github.com/opencontainers/runc/libcontainer/intelrdt.getIntelRdtRoot+0x88 (/usr/bin/runc)
            5612bcccda68 github.com/opencontainers/runc/libcontainer/intelrdt.GetIntelRdtPath+0x28 (/usr/bin/runc)
            5612bcdd349e github.com/opencontainers/runc/libcontainer.(*linuxContainer).currentState+0x8e (/usr/bin/runc)
            5612bcdc3344 github.com/opencontainers/runc/libcontainer.(*linuxContainer).State+0x84 (/usr/bin/runc)
            5612bce354c3 main.glob..func16+0xe3 (/usr/bin/runc)
            5612bcdf9cea github.com/opencontainers/runc/vendor/github.com/urfave/cli.HandleAction+0xca (/usr/bin/runc)
            5612bcdfaeb8 github.com/opencontainers/runc/vendor/github.com/urfave/cli.Command.Run+0x998 (/usr/bin/runc)
            5612bcdf8021 github.com/opencontainers/runc/vendor/github.com/urfave/cli.(*App).Run+0x6b1 (/usr/bin/runc)
            5612bce290c8 main.main+0xab8 (/usr/bin/runc)
            5612bcb44154 runtime.main+0x214 (/usr/bin/runc)

but without /proc/pid:

so i can not get it's address mapping file.

[leiqi96]

After runc launched a container, runc exited.
from your picture，you can not see any process which pid is 153973 and you can not see any informations from /proc

[Howie59]

runc is to tool to launch process, not a daemon