RE: semaphore and mutex in current Linux kernel (3.2.2)

[Chen, Dennis (SRDC SW)]

On Fri, Apr 6, 2012 at 6:10 PM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote:
> Chen, Dennis (SRDC SW) wrote:
>> On Thu, Apr 5, 2012 at 10:15 PM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote:
>>
>> I guess this is related with RCU component, but I don't found the right place where the code
>> Located yet.
>
> "On the internet, nobody can hear you being subtle."
>
> If some other process wants to run on the same CPU, needs_resched() is set.
> (This might happen to make the cursor blink, for keyboard input, or when
> somebody starts a rogue process like ps.)
>

Hmm, I forget that in each timer interrupt, __rcu_pending() will be called, it will call
set_need_resched() to set the TIF_NEED_RESCHED in some condition...
The optimization of mutex work closely with rcu, so fantastic!

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