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Date: Thu, 30 Mar 2017 20:54:15 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: heyunlei <heyunlei@...wei.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 1/2] f2fs: write small sized IO to hot log
On 03/31, heyunlei wrote:
> Hi Jaegeuk,
>
> On 2017/3/30 4:48, Jaegeuk Kim wrote:
> > It would better split small and large IOs separately in order to get more
> > consecutive big writes.
> >
> > The default threshold is set to 64KB, but configurable by sysfs/min_hot_blocks.
> >
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> > fs/f2fs/data.c | 9 +++++++++
> > fs/f2fs/f2fs.h | 2 ++
> > fs/f2fs/segment.c | 13 ++++++-------
> > fs/f2fs/segment.h | 1 +
> > fs/f2fs/super.c | 2 ++
> > 5 files changed, 20 insertions(+), 7 deletions(-)
> >
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index 090413236b27..8f36080b47c4 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -1432,6 +1432,8 @@ static int __write_data_page(struct page *page, bool *submitted,
> > need_balance_fs = true;
> > else if (has_not_enough_free_secs(sbi, 0, 0))
> > goto redirty_out;
> > + else
> > + set_inode_flag(inode, FI_HOT_DATA);
>
> Why here we need this, can you explain more about this?
I fixed this.
Please refer the up-to-date patch that I've been testing.
https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev-test&id=6976ab59090395014368296f154426c9311d69dc
https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev-test&id=65f770f2ead7dfdf661b2da49af1aa814b662c93
Thanks,
>
> Thanks.
>
> >
> > err = -EAGAIN;
> > if (f2fs_has_inline_data(inode)) {
> > @@ -1457,6 +1459,7 @@ static int __write_data_page(struct page *page, bool *submitted,
> > if (wbc->for_reclaim) {
> > f2fs_submit_merged_bio_cond(sbi, inode, 0, page->index,
> > DATA, WRITE);
> > + clear_inode_flag(inode, FI_HOT_DATA);
> > remove_dirty_inode(inode);
> > submitted = NULL;
> > }
> > @@ -1511,6 +1514,12 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> >
> > pagevec_init(&pvec, 0);
> >
> > + if (get_dirty_pages(mapping->host) <=
> > + SM_I(F2FS_M_SB(mapping))->min_hot_blocks)
> > + set_inode_flag(mapping->host, FI_HOT_DATA);
> > + else
> > + clear_inode_flag(mapping->host, FI_HOT_DATA);
> > +
> > if (wbc->range_cyclic) {
> > writeback_index = mapping->writeback_index; /* prev offset */
> > index = writeback_index;
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 5a49518ee786..32d6f674c114 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -678,6 +678,7 @@ struct f2fs_sm_info {
> > unsigned int ipu_policy; /* in-place-update policy */
> > unsigned int min_ipu_util; /* in-place-update threshold */
> > unsigned int min_fsync_blocks; /* threshold for fsync */
> > + unsigned int min_hot_blocks; /* threshold for hot block allocation */
> >
> > /* for flush command control */
> > struct flush_cmd_control *fcc_info;
> > @@ -1717,6 +1718,7 @@ enum {
> > FI_DO_DEFRAG, /* indicate defragment is running */
> > FI_DIRTY_FILE, /* indicate regular/symlink has dirty pages */
> > FI_NO_PREALLOC, /* indicate skipped preallocated blocks */
> > + FI_HOT_DATA, /* indicate file is hot */
> > };
> >
> > static inline void __mark_inode_dirty_flag(struct inode *inode,
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index b5b2a4745328..bff3f3bc7827 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -1841,18 +1841,16 @@ static int __get_segment_type_6(struct page *page, enum page_type p_type)
> > if (p_type == DATA) {
> > struct inode *inode = page->mapping->host;
> >
> > - if (S_ISDIR(inode->i_mode))
> > - return CURSEG_HOT_DATA;
> > - else if (is_cold_data(page) || file_is_cold(inode))
> > + if (is_cold_data(page) || file_is_cold(inode))
> > return CURSEG_COLD_DATA;
> > - else
> > - return CURSEG_WARM_DATA;
> > + if (is_inode_flag_set(inode, FI_HOT_DATA))
> > + return CURSEG_HOT_DATA;
> > + return CURSEG_WARM_DATA;
> > } else {
> > if (IS_DNODE(page))
> > return is_cold_node(page) ? CURSEG_WARM_NODE :
> > CURSEG_HOT_NODE;
> > - else
> > - return CURSEG_COLD_NODE;
> > + return CURSEG_COLD_NODE;
> > }
> > }
> >
> > @@ -2959,6 +2957,7 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
> > sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;
> > sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
> > sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
> > + sm_info->min_hot_blocks = DEF_MIN_HOT_BLOCKS;
> >
> > sm_info->trim_sections = DEF_BATCHED_TRIM_SECTIONS;
> >
> > diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> > index 31846b0fcb95..57e36c1ce7bd 100644
> > --- a/fs/f2fs/segment.h
> > +++ b/fs/f2fs/segment.h
> > @@ -540,6 +540,7 @@ static inline int utilization(struct f2fs_sb_info *sbi)
> > */
> > #define DEF_MIN_IPU_UTIL 70
> > #define DEF_MIN_FSYNC_BLOCKS 8
> > +#define DEF_MIN_HOT_BLOCKS 16
> >
> > enum {
> > F2FS_IPU_FORCE,
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index b4c5c6298698..2d78f3c76d18 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -296,6 +296,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
> > F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
> > F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
> > F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
> > +F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
> > F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
> > F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
> > F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
> > @@ -321,6 +322,7 @@ static struct attribute *f2fs_attrs[] = {
> > ATTR_LIST(ipu_policy),
> > ATTR_LIST(min_ipu_util),
> > ATTR_LIST(min_fsync_blocks),
> > + ATTR_LIST(min_hot_blocks),
> > ATTR_LIST(max_victim_search),
> > ATTR_LIST(dir_level),
> > ATTR_LIST(ram_thresh),
> >
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