Eric Dumazet a écrit :
I think your analysis is correct Pierre, but you speak of
'task-switches', where there is only a spinlock involved :
On UP case : a wake_up_all() wont preempt current thread : it will
task-switch only when current thread exits kernel mode.
On PREEMPT case : wake_up_all() wont preempt current thread (because
current thread is holding bh->lock).
On SMP : the awaken thread will spin some time on bh->lock, but not
task-switch again.
Ok, yes, you're right, thanks.
On RT kernel, this might be different of course...
So, I confirm it only happens on RT kernel ...
... but my patch does not work on those kernels :-/
In fact, I don't really see what's wrong ?
--
Pierre
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