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    SubjectRe: [RFC PATCH] sysrq: don't hold the sysrq_key_table_lock during the handler
    On Mon, 26 Jul 2010 17:54:02 +0800
    Xiaotian Feng <> wrote:

    > sysrq_key_table_lock is used to protect the sysrq_key_table, make sure
    > we get/replace the right operation for the sysrq. But in __handle_sysrq,
    > kernel will hold this lock and disable irqs until we finished op_p->handler().
    > This may cause false positive watchdog alert when we're doing "show-task-states"
    > on a system with many tasks.

    It would be better to find a suitable point in an inner loop and add an
    appropriately-commented touch_nmi_watchdog().

    That way the problem gets fixed for all irqs-off callers, not just one
    of them.

     \ /
      Last update: 2010-07-28 01:39    [W:0.018 / U:15.648 seconds]
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