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    SubjectRe: [PATCH 2/2] mm, memory_hotplug: remove timeout from __offline_memory
    On 2017/9/4 17:01, Michal Hocko wrote:

    > On Mon 04-09-17 16:58:30, Xishi Qiu wrote:
    >> On 2017/9/4 16:21, Michal Hocko wrote:
    >>
    >>> From: Michal Hocko <mhocko@suse.com>
    >>>
    >>> We have a hardcoded 120s timeout after which the memory offline fails
    >>> basically since the hot remove has been introduced. This is essentially
    >>> a policy implemented in the kernel. Moreover there is no way to adjust
    >>> the timeout and so we are sometimes facing memory offline failures if
    >>> the system is under a heavy memory pressure or very intensive CPU
    >>> workload on large machines.
    >>>
    >>> It is not very clear what purpose the timeout actually serves. The
    >>> offline operation is interruptible by a signal so if userspace wants
    >>
    >> Hi Michal,
    >>
    >> If the user know what he should do if migration for a long time,
    >> it is OK, but I don't think all the users know this operation
    >> (e.g. ctrl + c) and the affect.
    >
    > How is this operation any different from other potentially long
    > interruptible syscalls?
    >

    Hi Michal,

    I means the user should stop it by himself if migration always retry in endless.

    Thanks,
    Xishi Qiu

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