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docs: start documenting lazy-pages

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Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
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Mike Rapoport 2017-05-01 10:11:56 +03:00 • committed by Andrei Vagin
parent fc34b5144c
commit 668ea674bd
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Documentation/criu.txt
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@ -317,6 +317,15 @@ For example, the command line for the above example should look like this:
engine's default directory for tasks, permissions will not be preserved on
the upper directories with no tasks in them, which may cause problems.
*--lazy-pages*::
Perform the dump procedure without writing memory pages into the
image files and prepare to service page requests over the
network. When *dump* runs in this mode it presumes that
*lazy-pages* daemon will connect to it and fetch memory pages to
lazily inject them into the restored process address space. This
option is intended for post-copy (lazy) migration and should be
used in conjunction with *restore* with appropriate options.
*restore*
~~~~~~~~~
Restores previously checkpointed processes.
@ -466,6 +475,14 @@ are not adequate, but this can be suppressed by using *--cpu-cap=none*.
to restore on an older kernel, or a kernel configured without some
options.
*--lazy-pages*::
Restore the processes without filling out the entire memory
contents. When this option is used, *restore* sets up the
infrastucture required to fill memory pages either on demand when
the process accesses them or in the background without stopping the
restored process.
This option requires running *lazy-pages* daemon.
*check*
~~~~~~~
Checks whether the kernel supports the features needed by *criu* to
@ -532,6 +549,18 @@ Launches *criu* in page server mode.
*--port* 'number'::
Page server port number.
*lazy-pages*
~~~~~~~~~~~~
Launches *criu* in lazy-pages daemon mode.
The *lazy-pages* daemon is responsible for managing user-level demand
paging for the restored processes. It gets information required to
fill the process memory pages from the *restore* and from the
checkpont directory. When a restored process access certain memory
page for the first time, the *lazy-pages* daemon injects its contents
into the process address space. The memory pages that are not yet
requested by the restored processes are injected in the background.
*exec*
~~~~~~
Executes a system call inside a destination task\'s context. This functionality