Re: [PATCH] tmpfs: use ida to get inode number

[Matthew Wilcox]

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.