Messages in this thread | | | Subject | Re: semaphore => spinlock in {get|put}name | From | Andi Kleen <> | Date | 09 Mar 1998 15:10:44 +0100 |
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Jakub Jelinek <jj@sunsite.ms.mff.cuni.cz> writes:
> Hi! > > Is there any reason why do we use an expensive semaphore instead of a cheap > spinlock?
I think the reason is that get_free_page(GFP_KERNEL) may sleep, also a spin lock is a nop on UP (and UP needs it too because of the sleep).
-Andi
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