On 07/16/2012 04:12 PM, Thomas Gleixner wrote:
> Provide a generic interface for setting up and tearing down percpu
> threads.
>
> On registration the threads for already online cpus are created and
> started. On deregistration (modules) the threads are stoppped.
>
> During hotplug operations the threads are created, started, parked and
> unparked. The datastructure for registration provides a pointer to
> percpu storage space and optional setup, cleanup, park, unpark
> functions. These functions are called when the thread state changes.
>
> Each implementation has to provide a function which is queried and
> returns whether the thread should run and the thread function itself.
>
> The core code handles all state transitions and avoids duplicated code
> in the call sites.
>
> Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Elegant design and very beautiful code!
It was such a pleasure to read and review it :-)
Reviewed-by: Srivatsa S. Bhat <srivatsa.b...@linux.vnet.ibm.com>
[ A minor nit below ]
> ---
> include/linux/smpboot.h | 43 +++++++++
> kernel/cpu.c | 10 +-
> kernel/smpboot.c | 229
> ++++++++++++++++++++++++++++++++++++++++++++++++
> kernel/smpboot.h | 4
> 4 files changed, 285 insertions(+), 1 deletion(-)
>
> +
> +/**
> + * smpboot_thread_fn - percpu hotplug thread loop function
> + * @void: thread data pointer
s/void/data
> + *
> + * Checks for thread stop and park conditions. Calls the necessary
> + * setup, cleanup, park and unpark functions for the registered
> + * thread.
> + *
> + * Returns 1 when the thread should exit, 0 otherwise.
> + */
> +static int smpboot_thread_fn(void *data)
> +{
> + struct smpboot_thread_data *td = data;
> + struct smp_hotplug_thread *ht = td->ht;
> +
Regards,
Srivatsa S. Bhat
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