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f2fs: introduce lifetime write IO statistics

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This patch introduces lifetime IO write statistics exposed to the sysfs interface.
The write IO amount is obtained from block layer, accumulated in the file system and
stored in the hot node summary of checkpoint.

Signed-off-by: Shuoran Liu <liushuoran@huawei.com>
Signed-off-by: Pengyang Hou <houpengyang@huawei.com>
[Jaegeuk Kim: add sysfs documentation]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Shuoran Liu
2016-01-27 09:57:30 +08:00
committed by Jaegeuk Kim
parent 6fe2bc9561
commit 8f1dbbbbdf
5 changed files with 78 additions and 3 deletions
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11
fs/f2fs/checkpoint.c
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@@ -921,6 +921,9 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
int cp_payload_blks = __cp_payload(sbi);
block_t discard_blk = NEXT_FREE_BLKADDR(sbi, curseg);
bool invalidate = false;
struct super_block *sb = sbi->sb;
struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
u64 kbytes_written;
/*
* This avoids to conduct wrong roll-forward operations and uses
@@ -1034,6 +1037,14 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
write_data_summaries(sbi, start_blk);
start_blk += data_sum_blocks;
/* Record write statistics in the hot node summary */
kbytes_written = sbi->kbytes_written;
if (sb->s_bdev->bd_part)
kbytes_written += BD_PART_WRITTEN(sbi);
seg_i->sum_blk->info.kbytes_written = cpu_to_le64(kbytes_written);
if (__remain_node_summaries(cpc->reason)) {
write_node_summaries(sbi, start_blk);
start_blk += NR_CURSEG_NODE_TYPE;