Messages in this thread | | | From | "Chen, Dennis (SRDC SW)" <> | Subject | RE: semaphore and mutex in current Linux kernel (3.2.2) | Date | Fri, 6 Apr 2012 17:47:28 +0000 |
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On Fri, Apr 6, 2012 at 6:10 PM, Clemens Ladisch <clemens@ladisch.de> wrote: > Chen, Dennis (SRDC SW) wrote: >> On Thu, Apr 5, 2012 at 10:15 PM, Clemens Ladisch <clemens@ladisch.de> 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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