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A page is recently evicted if its last 4226 * eviction was recent enough that its reentry to the cache would 4227 * indicate that it is actively being used by the system, and that 4228 * there is memory pressure on the system. 4229 * 4230 * `off` and `len` must be non-negative integers. If `len` > 0, 4231 * the queried range is [`off`, `off` + `len`]. If `len` == 0, 4232 * we will query in the range from `off` to the end of the file. 4233 * 4234 * The `flags` argument is unused for now, but is included for future 4235 * extensibility. User should pass 0 (i.e no flag specified). 4236 * 4237 * Currently, hugetlbfs is not supported. 4238 * 4239 * Because the status of a page can change after cachestat() checks it 4240 * but before it returns to the application, the returned values may 4241 * contain stale information. 4242 * 4243 * return values: 4244 * zero - success 4245 * -EFAULT - cstat or cstat_range points to an illegal address 4246 * -EINVAL - invalid flags 4247 * -EBADF - invalid file descriptor 4248 * -EOPNOTSUPP - file descriptor is of a hugetlbfs file 4249 */ > 4250 SYSCALL_DEFINE4(cachestat, unsigned int, fd, -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests