On Fri, Aug 14, 2020 at 09:30:11AM +0800, Zhaoyang Huang wrote: > file->f_ra->ra_pages will remain the initialized value since it opend, which may > be NOT equal to bdi->ra_pages as the latter one is updated somehow(etc, > echo xxx > /sys/block/dm/queue/read_ahead_kb).So sync ra->ra_pages to the > updated value when sync read. It still ignores the work done by shrink_readahead_size_eio() and fadvise(POSIX_FADV_SEQUENTIAL).
