Hi all,
Could we move IPU judgement outside cp_rwsem lock like below:
if (set ipu policy)
if (ipu success)
return
lock_op
opu
unlock_op
And at same time when we write new checkpoint, we set ipu policy
during whole cp, the process is like this:
....|----OPU----|----IPU（write cp）----|----OPU----|----IPU（write cp）----|....
Thanks.
On 2017/4/21 17:56, Hou Pengyang wrote:
> If a page is cold, NOT atomit written and need_ipu now, there is
> a high probability that IPU should be adapted. For IPU, we try to
> check extent tree to get the block index first, instead of reading
> the dnode page, where may lead to an useless dnode IO, since no need to
> update the dnode index for IPU.
>
> Signed-off-by: Hou Pengyang <[email protected]>
> ---
> fs/f2fs/data.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 4ba11a6..3a660f7 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1355,8 +1355,34 @@ int do_write_data_page(struct f2fs_io_info *fio)
> struct page *page = fio->page;
> struct inode *inode = page->mapping->host;
> struct dnode_of_data dn;
> + struct extent_info ei = {0,0,0};
> int err = 0;
>
> + /*
> + * If a page is cold, NOT atomit written and need_ipu now, there is
> + * a high probability that IPU should be adapted. For IPU, we try to
> + * check extent tree to get the block index first, instead of reading
> + * the dnode page, where may lead to an useless dnode IO, since no need
> to
> + * update the dnode index for IPU.
> + */
> + if (unlikely(!is_cold_data(page) &&
> + !IS_ATOMIC_WRITTEN_PAGE(page) &&
> + need_inplace_update(inode, fio) &&
> + f2fs_lookup_extent_cache(inode, page->index, &ei))) {
> +
> + fio->old_blkaddr = ei.blk + page->index - ei.fofs;
> +
> + if (fio->old_blkaddr != NEW_ADDR &&
> + fio->old_blkaddr != NULL_ADDR) {
> + err = f2fs_encrypt_page(fio, page);
> + if (err)
> + return err;
> + set_page_writeback(page);
> + err = do_rewrite_data_page(fio, page);
> + return err;
> + }
> + }
> +
> set_new_dnode(&dn, inode, NULL, NULL, 0);
> err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
> if (err)
>
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