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    SubjectRe: [PATCH]: Fix bogus softlockup warning with sysrq-t
    Prarit Bhargava wrote:
    > There are some situations when soft lockup warnings are expected in the
    > kernel. For example, when doing an alt-sysrq-t on a large number of processes,
    > the dump to console can take a long time and the tasklist_lock is held over
    > that period. This results in a bogus soft lockup warning.

    Wouldn't it be better to just temporarily disable softlockups for the

    > This patch reworks touch_softlockup_watchdog to touch ALL cpu's
    > touch_timestamp. It also introduces touch_cpu_softlockup_watchdog to touch
    > a single cpu's touch_timestamp.

    Doesn't this mean that if one CPU gets locked up, it will be undetected
    so long as some other CPU is making progress?

    I have another pair of softlockup patches in which I try to address:

    * ignoring time stolen by hypervisors
    * threads going to sleep tickless for long periods of time

    I could easy add a "global disable" function, which would allow long
    sysrq messages, and it would help Thilo with his long flash update freezes.

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      Last update: 2007-03-27 07:45    [W:0.020 / U:2.996 seconds]
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