[Devel] [PATCH RH7 0/2]

[Pavel Tikhomirov]

Empty commit message header. Please remain the same name across 
versions, e.g. "Start time of a task inside a container"

On 1/13/20 11:25 AM, Valeriy Vdovin wrote:
> This patch addresses the problem of varying views on start time
> of a resumed process between container and host. From a container
> point of view the resumed process is the same old process with
> the same old start time, which hasn't changed after suspend/resume.
>  From a host point of view the resumed process is just a new one
> with a new start_time. Both the host and the container want to
> see start time that is only relevant to their context.
> 
> To support that we should teach the output of of /proc/pid/stat
> to show container-related value from container context and host-
> related value from host context.
> 
> The patch introduces new field to task_struct that stores container-
> related start time value. It will be seen in /proc/pid/stat in case
> if it was requested by a task, that's in ve cgroup.
> Setting this field can be done with prctl only from host or a
> container task with pseudosuper flag set.
> 
> At suspend this value is dumped by criu and at restore it's set back
> from a dump by criu.
> 
> Valeriy Vdovin (1):
>    ve/proc: Added separate start time field to task_struct to show in
>      container
> 
>   fs/proc/array.c            | 16 ++++------------
>   include/linux/sched.h      |  5 +++++
>   include/uapi/linux/prctl.h |  7 +++++++
>   kernel/fork.c              | 15 +++++++++++++++
>   kernel/sys.c               | 23 +++++++++++++++++++++++
>   kernel/ve/ve.c             | 22 ++++++++++++++++++++++
>   6 files changed, 76 insertions(+), 12 deletions(-)
> 
> (2):
>    dump/restore: Maintain proper start_time param from
>   criu/cr-dump.c         | 49 ++++++++++++++++++++++++++++++++++++
>   criu/cr-restore.c      | 68 ++++++++++++++++++++++++++++++--------------------
>   criu/include/crtools.h | 31 +++++++++++++++++++++++
>   images/core.proto      |  2 ++
>   4 files changed, 123 insertions(+), 27 deletions(-)
> 

-- 
Best regards, Tikhomirov Pavel
Software Developer, Virtuozzo.