Messages in this thread | | | From | "Manfred Spraul" <> | Subject | Re: 3rd version of R/W mmap_sem patch available | Date | Tue, 20 Mar 2001 00:13:14 +0100 |
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> > Besides, the fair semaphores would potentially slow things down, while > this potentially speeds things up. So.. It looks obvious enough. >
Rik, did you check that {pte,pmd}_alloc are thread safe? At least in 2.4.2 they aren't (include/asm-i386/pgalloc.h), and your patch doesn't touch pgalloc.
{pte,pmd}_alloc are called from handle_mm_fault, and that function is now running with down_read(). --
Manfred
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