Turns out that distro packages use this file as an indicator of the perf event subsystem - this is easier to check for from scripts than the existence of the system call. This is easy enough to keep around for the kernel, so add a comment to make sure it stays so.
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| @@ -938,6 +938,12 @@ static struct ctl_table kern_table[] = { · 937 unmodified lines | |||
| 938 | }, | 938 | }, |
| 939 | #endif | 939 | #endif |
| 940 | #ifdef CONFIG_PERF_EVENTS | 940 | #ifdef CONFIG_PERF_EVENTS |
| 941 | /* | ||
| 942 | * User-space scripts rely on the existence of this file | ||
| 943 | * as a feature check for perf_events being enabled. | ||
| 944 | * | ||
| 945 | * So it's an ABI, do not remove! | ||
| 946 | */ | ||
| 941 | { | 947 | { |
| 942 | .procname = "perf_event_paranoid", | 948 | .procname = "perf_event_paranoid", |
| 943 | .data = &sysctl_perf_event_paranoid, | 949 | .data = &sysctl_perf_event_paranoid, |