SYS_ARCH_SPECIFIC_SYSCALL   = 244
	SYS_WAIT4                   = 260
	SYS_PRLIMIT64               = 261
	SYS_FANOTIFY_INIT           = 262
	SYS_FANOTIFY_MARK           = 263
	SYS_NAME_TO_HANDLE_AT       = 264
	SYS_OPEN_BY_HANDLE_AT       = 265
	SYS_CLOCK_ADJTIME           = 266
	SYS_SYNCFS                  = 267
	SYS_SETNS                   = 268
	SYS_SENDMMSG                = 269
	SYS_PROCESS_VM_READV        = 270

	SYS_ARCH_SPECIFIC_SYSCALL   = 244
	SYS_WAIT4                   = 260
	SYS_PRLIMIT64               = 261
	SYS_FANOTIFY_INIT           = 262
	SYS_FANOTIFY_MARK           = 263
	SYS_NAME_TO_HANDLE_AT       = 264
	SYS_OPEN_BY_HANDLE_AT       = 265
	SYS_CLOCK_ADJTIME           = 266
	SYS_SYNCFS                  = 267
	SYS_SETNS                   = 268
	SYS_SENDMMSG                = 269
	SYS_PROCESS_VM_READV        = 270

	SYS_RISCV_FLUSH_ICACHE      = 259
	SYS_WAIT4                   = 260
	SYS_PRLIMIT64               = 261
	SYS_FANOTIFY_INIT           = 262
	SYS_FANOTIFY_MARK           = 263
	SYS_NAME_TO_HANDLE_AT       = 264
	SYS_OPEN_BY_HANDLE_AT       = 265
	SYS_CLOCK_ADJTIME           = 266
	SYS_SYNCFS                  = 267
	SYS_SETNS                   = 268
	SYS_SENDMMSG                = 269
	SYS_PROCESS_VM_READV        = 270

}

// duration computes the difference between now and the start time stored in the stamp.
//
// Returns 0 if the difference is negative, which may happen if now is stale or if the
// before and after timestamps cross a 2^(64-limiterEventBits) boundary.
func (s limiterEventStamp) duration(now int64) int64 {
	// The top limiterEventBits bits of the timestamp are derived from the current time
	// when computing a duration.

	SYS_MKNODAT                 = 259
	SYS_FCHOWNAT                = 260
	SYS_FUTIMESAT               = 261
	SYS_NEWFSTATAT              = 262
	SYS_UNLINKAT                = 263
	SYS_RENAMEAT                = 264
	SYS_LINKAT                  = 265
	SYS_SYMLINKAT               = 266
	SYS_READLINKAT              = 267
	SYS_FCHMODAT                = 268
	SYS_FACCESSAT               = 269
	SYS_PSELECT6                = 270

	SYS_CLOCK_NANOSLEEP         = 259
	SYS_SCHED_GETAFFINITY       = 260
	SYS_SCHED_SETAFFINITY       = 261
	SYS_TIMER_SETTIME           = 262
	SYS_TIMER_GETTIME           = 263
	SYS_TIMER_GETOVERRUN        = 264
	SYS_TIMER_DELETE            = 265
	SYS_TIMER_CREATE            = 266
	SYS_VSERVER                 = 267
	SYS_IO_SETUP                = 268
	SYS_IO_DESTROY              = 269
	SYS_IO_SUBMIT               = 270

	SYS_TIMER_GETOVERRUN             = 260
	SYS_TIMER_DELETE                 = 261
	SYS_CLOCK_SETTIME                = 262
	SYS_CLOCK_GETTIME                = 263
	SYS_CLOCK_GETRES                 = 264
	SYS_CLOCK_NANOSLEEP              = 265
	SYS_STATFS64                     = 266
	SYS_FSTATFS64                    = 267
	SYS_TGKILL                       = 268
	SYS_UTIMES                       = 269

	SYS_MBIND                   = 259
	SYS_GET_MEMPOLICY           = 260
	SYS_SET_MEMPOLICY           = 261
	SYS_MQ_OPEN                 = 262
	SYS_MQ_UNLINK               = 263
	SYS_MQ_TIMEDSEND            = 264
	SYS_MQ_TIMEDRECEIVE         = 265
	SYS_MQ_NOTIFY               = 266
	SYS_MQ_GETSETATTR           = 267
	SYS_KEXEC_LOAD              = 268
	SYS_ADD_KEY                 = 269
	SYS_REQUEST_KEY             = 270

	SYS_MBIND                   = 259
	SYS_GET_MEMPOLICY           = 260
	SYS_SET_MEMPOLICY           = 261
	SYS_MQ_OPEN                 = 262
	SYS_MQ_UNLINK               = 263
	SYS_MQ_TIMEDSEND            = 264
	SYS_MQ_TIMEDRECEIVE         = 265
	SYS_MQ_NOTIFY               = 266
	SYS_MQ_GETSETATTR           = 267
	SYS_KEXEC_LOAD              = 268
	SYS_ADD_KEY                 = 269
	SYS_REQUEST_KEY             = 270

	SYS_TIMER_SETTIME                = 260
	SYS_TIMER_GETTIME                = 261
	SYS_TIMER_GETOVERRUN             = 262
	SYS_TIMER_DELETE                 = 263
	SYS_CLOCK_SETTIME                = 264
	SYS_CLOCK_GETTIME                = 265
	SYS_CLOCK_GETRES                 = 266
	SYS_CLOCK_NANOSLEEP              = 267
	SYS_STATFS64                     = 268
	SYS_FSTATFS64                    = 269