Re: Mutex vs semaphores scheduler bug

[David Howells]

Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> The problem appears to be that rwsem doesn't allow lock-stealing

With good reason.  rwsems can be read or write locked for a long time - so if
readers can jump the queue on read-locked rwsems, then writer starvation is a
real possibility.  I carefully implemented it so that it is a strict FIFO to
avoid certain problems I was having.

David
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