On Thu, 2007-07-05 at 17:51 -0400, Mathieu Desnoyers wrote:
> Thread Migration Preemption
>
> This patch adds the ability to protect critical sections from migration to
> another CPU without disabling preemption.
>
> This will be useful to minimize the amount of preemption disabling for the -rt
> patch. It will help leveraging improvements brought by the local_t types in
> asm/local.h (see Documentation/local_ops.txt). Note that the updates done to
> variables protected by migration_disable must be either atomic or protected from
> concurrent updates done by other threads.
>
> Typical use:
>
> migration_disable();
> local_inc(&__get_cpu_var(&my_local_t_var));
> migration_enable();
>
> Which will increment the variable atomically wrt the local CPU.
>
> Comments (such as how to integrate this in the already almost full
> preempt_count) are welcome.
Ingo and Thomas, this also would help with the IRQ thread running a
softirq issue. We wouldn't need to bind to a CPU the thread. We could
simply disable the ability to migrate while the IRQ thread was handling
the softirqs.
-- Steve
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
