Difference between revisions of "Linux kernel"

Latest revision as of 08:55, 20 April 2021

Most likely the first thing to enable is the CONFIG_EXPERT=y (General setup -> Configure standard kernel features (expert users)) option, which on x86_64 depends on the CONFIG_EMBEDDED=y (General setup -> Embedded system) one (welcome to Kconfig reverse chains hell).

The following options must be enabled for CRIU to work:

General setup options
- CONFIG_CHECKPOINT_RESTORE=y (Checkpoint/restore support)
- CONFIG_NAMESPACES=y (Namespaces support)
- CONFIG_UTS_NS=y (Namespaces support -> UTS namespace)
- CONFIG_IPC_NS=y (Namespaces support -> IPC namespace)
- CONFIG_SYSVIPC_SYSCTL=y
- CONFIG_PID_NS=y (Namespaces support -> PID namespaces)
- CONFIG_NET_NS=y (Namespaces support -> Network namespace)
- CONFIG_FHANDLE=y (Open by fhandle syscalls)
- CONFIG_EVENTFD=y (Enable eventfd() system call)
- CONFIG_EPOLL=y (Enable eventpoll support)
Networking support -> Networking options options for sock-diag subsystem
- CONFIG_UNIX_DIAG=y (Unix domain sockets -> UNIX: socket monitoring interface)
- CONFIG_INET_DIAG=y (TCP/IP networking -> INET: socket monitoring interface)
- CONFIG_INET_UDP_DIAG=y (TCP/IP networking -> INET: socket monitoring interface -> UDP: socket monitoring interface)
- CONFIG_PACKET_DIAG=y (Packet socket -> Packet: sockets monitoring interface)
- CONFIG_NETLINK_DIAG=y (Netlink socket -> Netlink: sockets monitoring interface)
CONFIG_NETFILTER_XT_MARK=y (Networking support -> Networking options -> Network packet filtering framework (Netfilter) -> Core Netfilter Configuration -> Netfilter Xtables support (required for ip_tables) -> nfmark target and match support)
CONFIG_TUN=y (Networking support -> Universal TUN/TAP device driver support)

Other options not required by CRIU, but C/R supported (ZDTM test suite may fail without them):

CONFIG_INOTIFY_USER=y (File systems -> Inotify support for userspace)
CONFIG_FANOTIFY=y (File systems -> Filesystem wide access notification)
CONFIG_MEMCG=y (General setup -> Control Group support -> Memory controller)
CONFIG_CGROUP_DEVICE=y (General setup -> Control Group support -> Device controller)
CONFIG_MACVLAN=y (Device Drivers -> Network device support -> Network core driver support -> MAC-VLAN support)
CONFIG_BRIDGE=y (Networking support -> Networking options -> 802.1d Ethernet Bridging)
CONFIG_BINFMT_MISC=y (Userspace binary formats -> Kernel support for MISC binaries)
CONFIG_IA32_EMULATION=y (x86 only) (Executable file formats -> Emulations -> IA32 Emulation)

For some usage scenarios there is an ability to track memory changes and produce incremental dumps. Need to enable the CONFIG_MEM_SOFT_DIRTY=y (optional) (Processor type and features -> Track memory changes). In order to enable lazy migration, the userfaultfd system call is required CONFIG_USERFAULTFD=y (optional) (General setup -> Enable userfaultfd() system call).

In the beginning of the project we had our custom kernel, which contained some experimental CRIU related patches. Nowadays this is almost not used.

@@ Line 1: / Line 1: @@
-== Configuring the kernel ==
 Most likely the first thing to enable is the <code>CONFIG_EXPERT=y</code> (General setup -> Configure standard kernel features (expert users)) option, which on x86_64 depends on the <code>CONFIG_EMBEDDED=y</code> (General setup -> Embedded system) one (welcome to Kconfig reverse chains hell).
@@ Line 10: / Line 8: @@
 ** <code>CONFIG_UTS_NS=y</code> (Namespaces support -> UTS namespace)
 ** <code>CONFIG_IPC_NS=y</code> (Namespaces support -> IPC namespace)
+** <code>CONFIG_SYSVIPC_SYSCTL=y</code>
 ** <code>CONFIG_PID_NS=y</code> (Namespaces support -> PID namespaces)
 ** <code>CONFIG_NET_NS=y</code> (Namespaces support -> Network namespace)
@@ Line 21: / Line 20: @@
 ** <code>CONFIG_PACKET_DIAG=y</code> (Packet socket -> Packet: sockets monitoring interface)
 ** <code>CONFIG_NETLINK_DIAG=y</code> (Netlink socket -> Netlink: sockets monitoring interface)
+* <code>CONFIG_NETFILTER_XT_MARK=y</code> (Networking support -> Networking options -> Network packet filtering framework (Netfilter) -> Core Netfilter Configuration -> Netfilter Xtables support (required for ip_tables) -> nfmark target and match support)
+* <code>CONFIG_TUN=y</code> (Networking support -> Universal TUN/TAP device driver support)
 Other options not required by CRIU, but C/R supported ([[ZDTM test suite]] may fail without them):
 * <code>CONFIG_INOTIFY_USER=y</code> (File systems -> Inotify support for userspace)
 * <code>CONFIG_FANOTIFY=y</code> (File systems -> Filesystem wide access notification)
-* <code>CONFIG_NETFILTER_XT_MARK=y</code> (Networking support -> Networking options -> Network packet filtering framework (Netfilter) -> Core Netfilter Configuration -> Netfilter Xtables support (required for ip_tables) -> nfmark target and match support)
 * <code>CONFIG_MEMCG=y</code> (General setup -> Control Group support -> Memory controller)
 * <code>CONFIG_CGROUP_DEVICE=y</code> (General setup -> Control Group support -> Device controller)
@@ Line 33: / Line 34: @@
 * <code>CONFIG_IA32_EMULATION=y</code> (x86 only) (Executable file formats -> Emulations -> IA32 Emulation)
-For some [[usage scenarios]] there is an ability to track memory changes and produce [[incremental dumps]]. Need to enable the <code>CONFIG_MEM_SOFT_DIRTY=y</code> (optional) (Processor type and features -> Track memory changes).
+For some [[usage scenarios]] there is an ability to track memory changes and produce [[incremental dumps]]. Need to enable the <code>CONFIG_MEM_SOFT_DIRTY=y</code> (optional) (Processor type and features -> Track memory changes). In order to enable [[lazy migration]], the [[userfaultfd]] system call is required <code>CONFIG_USERFAULTFD=y</code> (optional) (General setup -> Enable userfaultfd() system call).
-Note we also have our [[custom kernel]], which might contain some experimental CRIU related patches.
+In the beginning of the project we had our [[custom kernel]], which contained some experimental CRIU related patches. Nowadays this is almost not used.
 [[Category: Building]]

Difference between revisions of "Linux kernel"

Latest revision as of 08:55, 20 April 2021

Navigation menu

Search