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Date: Tue, 01 Apr 2014 21:04:25 +0900
From: Jaegeuk Kim <jaegeuk.kim@...sung.com>
To: Chao Yu <chao2.yu@...sung.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH 1/2] f2fs: avoid free slab cache under spinlock
Hi Chao,
One minor thing as below.
2014-03-29 (토), 11:29 +0800, Chao Yu:
> Move kmem_cache_free out of spinlock protection region for better performance.
>
> Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> ---
> fs/f2fs/checkpoint.c | 27 +++++++++++++++++----------
> fs/f2fs/node.c | 15 ++++++++++++++-
> 2 files changed, 31 insertions(+), 11 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index a80be51..d877f46 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -347,10 +347,11 @@ void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
> list_for_each_entry(orphan, head, list) {
> if (orphan->ino == ino) {
> list_del(&orphan->list);
> - kmem_cache_free(orphan_entry_slab, orphan);
> f2fs_bug_on(sbi->n_orphans == 0);
> sbi->n_orphans--;
> - break;
> + spin_unlock(&sbi->orphan_inode_lock);
> + kmem_cache_free(orphan_entry_slab, orphan);
> + return;
> }
> }
> spin_unlock(&sbi->orphan_inode_lock);
> @@ -577,6 +578,7 @@ void set_dirty_dir_page(struct inode *inode, struct page *page)
> {
> struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
> struct dir_inode_entry *new;
> + int ret = 0;
>
> if (!S_ISDIR(inode->i_mode))
> return;
> @@ -586,12 +588,13 @@ void set_dirty_dir_page(struct inode *inode, struct page *page)
> INIT_LIST_HEAD(&new->list);
>
> spin_lock(&sbi->dir_inode_lock);
> - if (__add_dirty_inode(inode, new))
> - kmem_cache_free(inode_entry_slab, new);
> -
> + ret = __add_dirty_inode(inode, new);
> inode_inc_dirty_dents(inode);
> SetPagePrivate(page);
> spin_unlock(&sbi->dir_inode_lock);
> +
> + if (ret)
> + kmem_cache_free(inode_entry_slab, new);
> }
>
> void add_dirty_dir_inode(struct inode *inode)
> @@ -599,20 +602,22 @@ void add_dirty_dir_inode(struct inode *inode)
> struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
> struct dir_inode_entry *new =
> f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
> + int ret = 0;
>
> new->inode = inode;
> INIT_LIST_HEAD(&new->list);
>
> spin_lock(&sbi->dir_inode_lock);
> - if (__add_dirty_inode(inode, new))
> - kmem_cache_free(inode_entry_slab, new);
> + ret = __add_dirty_inode(inode, new);
> spin_unlock(&sbi->dir_inode_lock);
> +
> + if (ret)
> + kmem_cache_free(inode_entry_slab, new);
> }
>
> void remove_dirty_dir_inode(struct inode *inode)
> {
> struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
> -
> struct list_head *this, *head;
>
> if (!S_ISDIR(inode->i_mode))
> @@ -630,13 +635,15 @@ void remove_dirty_dir_inode(struct inode *inode)
> entry = list_entry(this, struct dir_inode_entry, list);
> if (entry->inode == inode) {
> list_del(&entry->list);
> - kmem_cache_free(inode_entry_slab, entry);
> stat_dec_dirty_dir(sbi);
> - break;
> + spin_unlock(&sbi->dir_inode_lock);
> + kmem_cache_free(inode_entry_slab, entry);
> + goto done;
> }
> }
> spin_unlock(&sbi->dir_inode_lock);
>
> +done:
> /* Only from the recovery routine */
> if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
> clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index eced8d7..0021056 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1314,7 +1314,6 @@ static void __del_from_free_nid_list(struct f2fs_nm_info *nm_i,
> {
> list_del(&i->list);
> radix_tree_delete(&nm_i->free_nid_root, i->nid);
> - kmem_cache_free(free_nid_slab, i);
> }
>
> static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
> @@ -1361,13 +1360,19 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
> static void remove_free_nid(struct f2fs_nm_info *nm_i, nid_t nid)
> {
> struct free_nid *i;
> + bool need_free = false;
> +
> spin_lock(&nm_i->free_nid_list_lock);
> i = __lookup_free_nid_list(nm_i, nid);
> if (i && i->state == NID_NEW) {
> __del_from_free_nid_list(nm_i, i);
> nm_i->fcnt--;
> + need_free = true;
> }
> spin_unlock(&nm_i->free_nid_list_lock);
> +
> + if (need_free)
> + kmem_cache_free(free_nid_slab, i);
> }
>
> static void scan_nat_page(struct f2fs_nm_info *nm_i,
> @@ -1492,6 +1497,8 @@ void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
> f2fs_bug_on(!i || i->state != NID_ALLOC);
> __del_from_free_nid_list(nm_i, i);
> spin_unlock(&nm_i->free_nid_list_lock);
> +
> + kmem_cache_free(free_nid_slab, i);
> }
>
> /*
> @@ -1501,6 +1508,7 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
> {
> struct f2fs_nm_info *nm_i = NM_I(sbi);
> struct free_nid *i;
> + bool need_free = false;
>
> if (!nid)
> return;
> @@ -1510,11 +1518,15 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
> f2fs_bug_on(!i || i->state != NID_ALLOC);
> if (!available_free_memory(nm_i, FREE_NIDS)) {
> __del_from_free_nid_list(nm_i, i);
> + need_free = true;
> } else {
> i->state = NID_NEW;
> nm_i->fcnt++;
> }
> spin_unlock(&nm_i->free_nid_list_lock);
> +
> + if (need_free)
> + kmem_cache_free(free_nid_slab, i);
> }
>
> void recover_node_page(struct f2fs_sb_info *sbi, struct page *page,
> @@ -1926,6 +1938,7 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
> f2fs_bug_on(i->state == NID_ALLOC);
> __del_from_free_nid_list(nm_i, i);
> nm_i->fcnt--;
> + kmem_cache_free(free_nid_slab, i);
It seems that we need to do this too.
spin_unlock(&nm_i->free_nid_list_lock);
kmem_cache_free(free_nid_slab, i);
spin_lock(&nm_i->free_nid_list_lock);
Right?
> }
> f2fs_bug_on(nm_i->fcnt);
> spin_unlock(&nm_i->free_nid_list_lock);
--
Jaegeuk Kim
Samsung
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