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f2fs: use BIO_MAX_PAGES for bio allocation 

We don't need to allocate bio partially in order to maximize sequential writes.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-10-18 11:07:45 -07:00
parent 3e7b5bbbef
commit 664ba972df
5 changed files with 8 additions and 22 deletions
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2
fs/f2fs/checkpoint.c
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@ -228,7 +228,7 @@ void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
f2fs_put_page(page, 0);
if (readahead)
ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR, true);
ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
}
static int f2fs_write_meta_page(struct page *page,

4
fs/f2fs/data.c
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@ -277,10 +277,8 @@ void f2fs_submit_page_mbio(struct f2fs_io_info *fio)
__submit_merged_bio(io);
alloc_new:
if (io->bio == NULL) {
int bio_blocks = MAX_BIO_BLOCKS(sbi);
io->bio = __bio_alloc(sbi, fio->new_blkaddr,
bio_blocks, is_read);
BIO_MAX_PAGES, is_read);
io->fio = *fio;
}

3
fs/f2fs/node.c
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@ -2098,7 +2098,6 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
struct f2fs_node *rn;
struct f2fs_summary *sum_entry;
block_t addr;
int bio_blocks = MAX_BIO_BLOCKS(sbi);
int i, idx, last_offset, nrpages;
/* scan the node segment */
@ -2107,7 +2106,7 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
sum_entry = &sum->entries[0];
for (i = 0; i < last_offset; i += nrpages, addr += nrpages) {
nrpages = min(last_offset - i, bio_blocks);
nrpages = min(last_offset - i, BIO_MAX_PAGES);
/* readahead node pages */
ra_meta_pages(sbi, addr, nrpages, META_POR, true);

4
fs/f2fs/segment.c
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@ -2317,10 +2317,10 @@ static void build_sit_entries(struct f2fs_sb_info *sbi)
int sit_blk_cnt = SIT_BLK_CNT(sbi);
unsigned int i, start, end;
unsigned int readed, start_blk = 0;
int nrpages = MAX_BIO_BLOCKS(sbi) * 8;
do {
readed = ra_meta_pages(sbi, start_blk, nrpages, META_SIT, true);
readed = ra_meta_pages(sbi, start_blk, BIO_MAX_PAGES,
META_SIT, true);
start = start_blk * sit_i->sents_per_block;
end = (start_blk + readed) * sit_i->sents_per_block;

17
fs/f2fs/segment.h
View File

@ -102,8 +102,6 @@
(((sector_t)blk_addr) << F2FS_LOG_SECTORS_PER_BLOCK)
#define SECTOR_TO_BLOCK(sectors) \
(sectors >> F2FS_LOG_SECTORS_PER_BLOCK)
#define MAX_BIO_BLOCKS(sbi) \
((int)min((int)max_hw_blocks(sbi), BIO_MAX_PAGES))
/*
* indicate a block allocation direction: RIGHT and LEFT.
@ -696,13 +694,6 @@ static inline bool sec_usage_check(struct f2fs_sb_info *sbi, unsigned int secno)
return false;
}
static inline unsigned int max_hw_blocks(struct f2fs_sb_info *sbi)
{
struct block_device *bdev = sbi->sb->s_bdev;
struct request_queue *q = bdev_get_queue(bdev);
return SECTOR_TO_BLOCK(queue_max_sectors(q));
}
/*
* It is very important to gather dirty pages and write at once, so that we can
* submit a big bio without interfering other data writes.
@ -720,7 +711,7 @@ static inline int nr_pages_to_skip(struct f2fs_sb_info *sbi, int type)
else if (type == NODE)
return 8 * sbi->blocks_per_seg;
else if (type == META)
return 8 * MAX_BIO_BLOCKS(sbi);
return 8 * BIO_MAX_PAGES;
else
return 0;
}
@ -737,11 +728,9 @@ static inline long nr_pages_to_write(struct f2fs_sb_info *sbi, int type,
return 0;
nr_to_write = wbc->nr_to_write;
desired = BIO_MAX_PAGES;
if (type == NODE)
desired = 2 * max_hw_blocks(sbi);
else
desired = MAX_BIO_BLOCKS(sbi);
desired <<= 1;
wbc->nr_to_write = desired;
return desired - nr_to_write;