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| author | Damien Le Moal <damien.lemoal@wdc.com> | 2019-03-16 09:13:07 +0900 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2019-04-05 09:33:55 -0700 |
| commit | 95175dafc4399ab5b9e937da205b2a6927b19227 (patch) | |
| tree | 2c09a8e8f4fd9cd970e8ed93a09dcabbf1e64e27 /fs/f2fs/super.c | |
| parent | 0916878da355650d7e77104a7ac0fa1784eca852 (diff) | |
| download | linux-95175dafc4399ab5b9e937da205b2a6927b19227.tar.gz linux-95175dafc4399ab5b9e937da205b2a6927b19227.tar.bz2 linux-95175dafc4399ab5b9e937da205b2a6927b19227.zip | |
f2fs: Reduce zoned block device memory usage
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@wdc.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/super.c')
| -rw-r--r-- | fs/f2fs/super.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index f2aaa2cc6b3e..0b6fa77c35f3 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1024,7 +1024,7 @@ static void destroy_device_list(struct f2fs_sb_info *sbi) for (i = 0; i < sbi->s_ndevs; i++) { blkdev_put(FDEV(i).bdev, FMODE_EXCL); #ifdef CONFIG_BLK_DEV_ZONED - kvfree(FDEV(i).blkz_type); + kvfree(FDEV(i).blkz_seq); #endif } kvfree(sbi->devs); @@ -2798,9 +2798,11 @@ static int init_blkz_info(struct f2fs_sb_info *sbi, int devi) if (nr_sectors & (bdev_zone_sectors(bdev) - 1)) FDEV(devi).nr_blkz++; - FDEV(devi).blkz_type = f2fs_kmalloc(sbi, FDEV(devi).nr_blkz, - GFP_KERNEL); - if (!FDEV(devi).blkz_type) + FDEV(devi).blkz_seq = f2fs_kzalloc(sbi, + BITS_TO_LONGS(FDEV(devi).nr_blkz) + * sizeof(unsigned long), + GFP_KERNEL); + if (!FDEV(devi).blkz_seq) return -ENOMEM; #define F2FS_REPORT_NR_ZONES 4096 @@ -2827,7 +2829,8 @@ static int init_blkz_info(struct f2fs_sb_info *sbi, int devi) } for (i = 0; i < nr_zones; i++) { - FDEV(devi).blkz_type[n] = zones[i].type; + if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL) + set_bit(n, FDEV(devi).blkz_seq); sector += zones[i].len; n++; } |