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f2fs: introduce async IPU policy 

This patch introduces an ASYNC IPU policy.

Under senario of large # of async updating(e.g. log writing in Android),
disk would be seriously fragmented, and higher frequent gc would be triggered.

This patch uses IPU to rewrite the async update writting, since async is
NOT sensitive to io latency.

Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
This commit is contained in:
Hou Pengyang 2017-04-18 11:57:16 +00:00 committed by Jaegeuk Kim
parent d84d1cbdec
commit 04485987f0
3 changed files with 13 additions and 3 deletions
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2
fs/f2fs/data.c
View File

@ -1356,7 +1356,7 @@ retry_encrypt:
if (unlikely(fio->old_blkaddr != NEW_ADDR &&
!is_cold_data(page) &&
!IS_ATOMIC_WRITTEN_PAGE(page) &&
need_inplace_update(inode))) {
need_inplace_update(inode, fio))) {
f2fs_unlock_op(F2FS_I_SB(inode));
fio->cp_rwsem_locked = false;
err = rewrite_data_page(fio);

2
fs/f2fs/file.c
View File

@ -1898,7 +1898,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
int err;
/* if in-place-update policy is enabled, don't waste time here */
if (need_inplace_update(inode))
if (need_inplace_update(inode, NULL))
return -EINVAL;
pg_start = range->start >> PAGE_SHIFT;

12
fs/f2fs/segment.h
View File

@ -556,9 +556,11 @@ enum {
F2FS_IPU_UTIL,
F2FS_IPU_SSR_UTIL,
F2FS_IPU_FSYNC,
F2FS_IPU_ASYNC,
};
static inline bool need_inplace_update(struct inode *inode)
static inline bool need_inplace_update(struct inode *inode,
struct f2fs_io_info *fio)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
unsigned int policy = SM_I(sbi)->ipu_policy;
@ -581,6 +583,14 @@ static inline bool need_inplace_update(struct inode *inode)
utilization(sbi) > SM_I(sbi)->min_ipu_util)
return true;
/*
* IPU for rewrite async pages
*/
if (policy & (0x1 << F2FS_IPU_ASYNC) &&
fio && fio->op == REQ_OP_WRITE &&
!(fio->op_flags & REQ_SYNC))
return true;
/* this is only set during fdatasync */
if (policy & (0x1 << F2FS_IPU_FSYNC) &&
is_inode_flag_set(inode, FI_NEED_IPU))