Simplify and optimize inotify and fanotify read_events APIs
#2315
| Job | Run time |
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| 4m 9s | |
| 1m 27s | |
| 1m 28s | |
| 1m 45s | |
| 1m 32s | |
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| 1m 3s | |
| 1m 14s | |
| 16s | |
| 1m 28s | |
| 1m 3s | |
| 1m 5s | |
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| 17m 59s |