Messages in this thread | | | From | "Stefan Monnier" <monnier+lists/linux/kernel/news/@tequila.cs.yale.edu> | Subject | Re: spin_unlock optimization(i386) | Date | 30 Nov 1999 02:34:01 -0500 |
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>>>>> "Andrea" == Andrea Arcangeli <andrea@suse.de> writes: > Because the write buffer as documented is not allowed to show changes to > the other cpus not in processor order. It can only delay the writes > undefinitely but that make no difference at all for SMP.
Of course it makes a difference:
A = 1 B = 0 read B read A
You might very well get `read A=0' and `read B=1' even though this does not correspond to any UP interleaving of the two threads.
Stefan
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