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Message-id: <00be01d13c79$a3db6970$eb923c50$@samsung.com>
Date: Tue, 22 Dec 2015 13:28:09 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: 'Jaegeuk Kim' <jaegeuk@...nel.org>
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: use atomic variable for
total_extent_tree
Hi Jaegeuk,
> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Tuesday, December 22, 2015 11:39 AM
> To: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> linux-f2fs-devel@...ts.sourceforge.net
> Cc: Jaegeuk Kim
> Subject: [f2fs-dev] [PATCH 1/2] f2fs: use atomic variable for total_extent_tree
>
> It would be better to use atomic variable for total_extent_tree.
total_extent_tree was protected by extent_tree_lock semaphore, so intention here
is to make related calculation in available_free_memory or update_general_status
more accurate, right?
Thanks,
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> fs/f2fs/debug.c | 5 +++--
> fs/f2fs/extent_cache.c | 8 ++++----
> fs/f2fs/f2fs.h | 2 +-
> fs/f2fs/node.c | 3 ++-
> fs/f2fs/shrinker.c | 3 ++-
> 5 files changed, 12 insertions(+), 9 deletions(-)
>
> diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> index bb307e6..ed5dfcc 100644
> --- a/fs/f2fs/debug.c
> +++ b/fs/f2fs/debug.c
> @@ -38,7 +38,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
> si->hit_rbtree = atomic64_read(&sbi->read_hit_rbtree);
> si->hit_total = si->hit_largest + si->hit_cached + si->hit_rbtree;
> si->total_ext = atomic64_read(&sbi->total_hit_ext);
> - si->ext_tree = sbi->total_ext_tree;
> + si->ext_tree = atomic_read(&sbi->total_ext_tree);
> si->ext_node = atomic_read(&sbi->total_ext_node);
> si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
> si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
> @@ -193,7 +193,8 @@ get_cache:
> si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
> for (i = 0; i <= UPDATE_INO; i++)
> si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
> - si->cache_mem += sbi->total_ext_tree * sizeof(struct extent_tree);
> + si->cache_mem += atomic_read(&sbi->total_ext_tree) *
> + sizeof(struct extent_tree);
> si->cache_mem += atomic_read(&sbi->total_ext_node) *
> sizeof(struct extent_node);
>
> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
> index e86e9f1e..0e97d6af 100644
> --- a/fs/f2fs/extent_cache.c
> +++ b/fs/f2fs/extent_cache.c
> @@ -70,7 +70,7 @@ static struct extent_tree *__grab_extent_tree(struct inode *inode)
> rwlock_init(&et->lock);
> atomic_set(&et->refcount, 0);
> et->count = 0;
> - sbi->total_ext_tree++;
> + atomic_inc(&sbi->total_ext_tree);
> }
> atomic_inc(&et->refcount);
> up_write(&sbi->extent_tree_lock);
> @@ -570,7 +570,7 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int
> nr_shrink)
>
> radix_tree_delete(root, et->ino);
> kmem_cache_free(extent_tree_slab, et);
> - sbi->total_ext_tree--;
> + atomic_dec(&sbi->total_ext_tree);
> tree_cnt++;
>
> if (node_cnt + tree_cnt >= nr_shrink)
> @@ -663,7 +663,7 @@ void f2fs_destroy_extent_tree(struct inode *inode)
> f2fs_bug_on(sbi, atomic_read(&et->refcount) || et->count);
> radix_tree_delete(&sbi->extent_tree_root, inode->i_ino);
> kmem_cache_free(extent_tree_slab, et);
> - sbi->total_ext_tree--;
> + atomic_dec(&sbi->total_ext_tree);
> up_write(&sbi->extent_tree_lock);
>
> F2FS_I(inode)->extent_tree = NULL;
> @@ -715,7 +715,7 @@ void init_extent_cache_info(struct f2fs_sb_info *sbi)
> init_rwsem(&sbi->extent_tree_lock);
> INIT_LIST_HEAD(&sbi->extent_list);
> spin_lock_init(&sbi->extent_lock);
> - sbi->total_ext_tree = 0;
> + atomic_set(&sbi->total_ext_tree, 0);
> atomic_set(&sbi->total_ext_node, 0);
> }
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 19beabe..a7f6191 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -762,7 +762,7 @@ struct f2fs_sb_info {
> struct rw_semaphore extent_tree_lock; /* locking extent radix tree */
> struct list_head extent_list; /* lru list for shrinker */
> spinlock_t extent_lock; /* locking extent lru list */
> - int total_ext_tree; /* extent tree count */
> + atomic_t total_ext_tree; /* extent tree count */
> atomic_t total_ext_node; /* extent info count */
>
> /* basic filesystem units */
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index d842b19..6cc8ac7 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -65,7 +65,8 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
> sizeof(struct ino_entry)) >> PAGE_CACHE_SHIFT;
> res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
> } else if (type == EXTENT_CACHE) {
> - mem_size = (sbi->total_ext_tree * sizeof(struct extent_tree) +
> + mem_size = (atomic_read(&sbi->total_ext_tree) *
> + sizeof(struct extent_tree) +
> atomic_read(&sbi->total_ext_node) *
> sizeof(struct extent_node)) >> PAGE_CACHE_SHIFT;
> res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
> diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
> index da0d8e0..a11e099 100644
> --- a/fs/f2fs/shrinker.c
> +++ b/fs/f2fs/shrinker.c
> @@ -32,7 +32,8 @@ static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
>
> static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi)
> {
> - return sbi->total_ext_tree + atomic_read(&sbi->total_ext_node);
> + return atomic_read(&sbi->total_ext_tree) +
> + atomic_read(&sbi->total_ext_node);
> }
>
> unsigned long f2fs_shrink_count(struct shrinker *shrink,
> --
> 2.5.4 (Apple Git-61)
>
>
> ------------------------------------------------------------------------------
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@...ts.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
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