Hi Vyacheslav, > NILFS2 has special method nilfs_sb_need_update() [1] and special > constant NILFS_SB_FREQ [2] that it is used usually for definition > frequency of superblocks updating. So, as far as I can judge, default > value of such frequency under high I/O load is 10 seconds (Minimum > interval of periodical update of superblocks (in seconds)). > > [1] http://lxr.free-electrons.com/source/fs/nilfs2/the_nilfs.h#L254 > [2] http://lxr.free-electrons.com/source/fs/nilfs2/the_nilfs.h#L252 Thanks for the in-depth explanation. > We need to the periodical in-place superblock write only for updating > a pointer to the most latest log. And, this will be eliminable if we > can invent the fast way to determine the latest log. Maybe it would be enough to detect whether the stored pointer to the last log is recent and otherwise perform a slow scan? Thanks, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
