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Re: Dynamically allocated locks
On Mar 25, 2008, at 1:04 PM, jonathan%dsg.stanford.edu@localhost wrote:
In message <FA2A84E8-8919-42A8-883C-A6658DCC3FE6%shagadelic.org@localhost>,
Jason Thorpe writes:
On Mar 24, 2008, at 10:10 AM, Matt Thomas wrote:
Yes. One / cacheline size is a dramatic waste of space. Some
128 bytes per cacheline. On systems with small caches or UP systems
Two independent locks in a single cache line is guaranteed to
false-sharing situation. It is best avoided, even if cache pressure
is the trade-off.
Even on a UP system? In the kernel? Surely not.
Obviously on a UP system, it doesn't matter, and Andy already
suggested that he would change the code to account for that.
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