On Sat, Nov 23, 2019 at 10:16:39AM +0800, zhengbin (A) wrote: > By the way, percpu IDA is for reducing performance impact? This patch has 2.16% > performance degradation(Use perf to get the cost of ida_alloc_range) 2.16% degradation in your tests ... I bet Eric didn't make it so complex for only 2% performance impact. Unfortunately, he didn't give any numbers in his patch submission, but it's going to be a bigger problem on multi-socket machines than on a laptop. Eric, any memories from 2010? Commit f991bd2e14210fb93d722cb23e54991de20e8a3d if it helps.
