cacheline alignment and per-cpu data
From: Chris Friesen
Date: Fri Jun 09 2006 - 11:40:00 EST
Someone asked me a question that I couldn't answer, so I thought I'd
pass it on to here.
Suppose I declare an array of a struct type, where the size of the
struct is not a multiple of the cacheline size. Each element in the
array is used by a different cpu.
If I understand it, this would mean that the last member in the data
belonging to one cpu shares a cacheline with the first member in the
data belonging to the next cpu.
Will this cause cacheline pingpong? If I do this sort of thing do I
need to ensure that the struct is a multiple of cacheline size (or
specify cacheline alignement)?
Thanks,
Chris
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/