On 2019/3/16 8:13, Damien Le Moal wrote: > For zoned block devices, an array of zone types for each device is > allocated and initialized in order to determine if a section is stored > on a sequential zone (zone reset needed) or a conventional zone (no > zone reset needed and regular discard applies). Considering this usage, > the zone types stored in memory can be replaced with a bitmap to > indicate an equivalent information, that is, if a zone is sequential or > not. This reduces the memory usage for each zoned device by roughly 8: > on a 14TB disk with zones of 256 MB, the zone type array consumes > 13x4KB pages while the bitmap uses only 2x4KB pages. > > This patch changes the f2fs_dev_info structure blkz_type field to the > bitmap blkz_seq. Access to this bitmap is done using the helper > function f2fs_blkz_is_seq(), which is a rewrite of the function > get_blkz_type(). > > Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx> Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx> Thanks,
