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f2fs: support in batch multi blocks preallocation

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This patch introduces reserve_new_blocks to make preallocation of multi
blocks as in batch operation, so it can avoid lots of redundant
operation, result in better performance.

In virtual machine, with rotational device:

time fallocate -l 32G /mnt/f2fs/file

Before:
real	0m4.584s
user	0m0.000s
sys	0m4.580s

After:
real	0m0.292s
user	0m0.000s
sys	0m0.272s

In x86, with SSD:

time fallocate -l 500G $MNT/testfile

Before : 24.758 s
After  :  1.604 s

Signed-off-by: Chao Yu <yuchao0@huawei.com>
[Jaegeuk Kim: fix bugs and add performance numbers measured in x86.]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2016-05-09 19:56:30 +08:00
committed by Jaegeuk Kim
parent 0fac558b96
commit 46008c6d42
3 changed files with 117 additions and 49 deletions
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14
include/trace/events/f2fs.h
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@@ -694,28 +694,32 @@ TRACE_EVENT(f2fs_direct_IO_exit,
__entry->ret)
);
TRACE_EVENT(f2fs_reserve_new_block,
TRACE_EVENT(f2fs_reserve_new_blocks,
TP_PROTO(struct inode *inode, nid_t nid, unsigned int ofs_in_node),
TP_PROTO(struct inode *inode, nid_t nid, unsigned int ofs_in_node,
blkcnt_t count),
TP_ARGS(inode, nid, ofs_in_node),
TP_ARGS(inode, nid, ofs_in_node, count),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(nid_t, nid)
__field(unsigned int, ofs_in_node)
__field(blkcnt_t, count)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->nid = nid;
__entry->ofs_in_node = ofs_in_node;
__entry->count = count;
),
TP_printk("dev = (%d,%d), nid = %u, ofs_in_node = %u",
TP_printk("dev = (%d,%d), nid = %u, ofs_in_node = %u, count = %llu",
show_dev(__entry),
(unsigned int)__entry->nid,
__entry->ofs_in_node)
__entry->ofs_in_node,
(unsigned long long)__entry->count)
);
DECLARE_EVENT_CLASS(f2fs__submit_page_bio,