Re: alignment faults in 3.6

On Fri, Oct 12, 2012 at 04:48:20PM +0200, Eric Dumazet wrote:

quoted

Somehow, I doubt anyone would be willing to walk through all the noise the 
faults would likely trigger.

If this can be mapped to an event that can be used by perf tool, that
might be useful ?

There are performance counters for the various different types of alignment 
faults supported by perf. Modern x86 makes the vast majority of unaligned 
accesses very low overhead -- the only ones that really hurt are those 
straddling different vm pages, but even those have little cost compared to 
obsolete microarchitectures (*cough* P4 *cough*).

		-ben
-- 
"Thought is the essence of where you are now."