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Date: Tue, 19 Oct 2010 18:12:07 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: npiggin@...nel.dk
CC: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [patch 27/35] fs: icache split IO and LRU lists
On Tue, 19 Oct 2010, npiggin@...nel.d wrote:
> Split inode reclaim and writeback lists in preparation to scale them up
> (per-bdi locking for i_io and per-zone locking for i_lru)
>
> Signed-off-by: Nick Piggin <npiggin@...nel.dk>
>
> ---
> fs/fs-writeback.c | 30 +++++++++++++++++-------------
> fs/inode.c | 46 +++++++++++++++++++++++++++-------------------
> fs/nilfs2/mdt.c | 3 ++-
> include/linux/fs.h | 3 ++-
> mm/backing-dev.c | 6 +++---
> 5 files changed, 51 insertions(+), 37 deletions(-)
>
> Index: linux-2.6/fs/fs-writeback.c
> ===================================================================
> --- linux-2.6.orig/fs/fs-writeback.c 2010-10-19 14:18:59.000000000 +1100
> +++ linux-2.6/fs/fs-writeback.c 2010-10-19 14:19:21.000000000 +1100
> @@ -173,11 +173,11 @@
> if (!list_empty(&wb->b_dirty)) {
> struct inode *tail;
>
> - tail = list_entry(wb->b_dirty.next, struct inode, i_list);
> + tail = list_entry(wb->b_dirty.next, struct inode, i_io);
> if (time_before(inode->dirtied_when, tail->dirtied_when))
> inode->dirtied_when = jiffies;
> }
> - list_move(&inode->i_list, &wb->b_dirty);
> + list_move(&inode->i_io, &wb->b_dirty);
> }
>
> /*
> @@ -188,7 +188,7 @@
> struct bdi_writeback *wb = &inode_to_bdi(inode)->wb;
>
> assert_spin_locked(&wb_inode_list_lock);
> - list_move(&inode->i_list, &wb->b_more_io);
> + list_move(&inode->i_io, &wb->b_more_io);
> }
>
> static void inode_sync_complete(struct inode *inode)
> @@ -230,14 +230,14 @@
>
> assert_spin_locked(&wb_inode_list_lock);
> while (!list_empty(delaying_queue)) {
> - inode = list_entry(delaying_queue->prev, struct inode, i_list);
> + inode = list_entry(delaying_queue->prev, struct inode, i_io);
> if (older_than_this &&
> inode_dirtied_after(inode, *older_than_this))
> break;
> if (sb && sb != inode->i_sb)
> do_sb_sort = 1;
> sb = inode->i_sb;
> - list_move(&inode->i_list, &tmp);
> + list_move(&inode->i_io, &tmp);
> }
>
> /* just one sb in list, splice to dispatch_queue and we're done */
> @@ -248,12 +248,12 @@
>
> /* Move inodes from one superblock together */
> while (!list_empty(&tmp)) {
> - inode = list_entry(tmp.prev, struct inode, i_list);
> + inode = list_entry(tmp.prev, struct inode, i_io);
> sb = inode->i_sb;
> list_for_each_prev_safe(pos, node, &tmp) {
> - inode = list_entry(pos, struct inode, i_list);
> + inode = list_entry(pos, struct inode, i_io);
> if (inode->i_sb == sb)
> - list_move(&inode->i_list, dispatch_queue);
> + list_move(&inode->i_io, dispatch_queue);
> }
> }
> }
> @@ -422,7 +422,11 @@
> /*
> * The inode is clean
> */
> - list_move(&inode->i_list, &inode_unused);
> + list_del_init(&inode->i_io);
> + if (list_empty(&inode->i_lru)) {
> + list_add(&inode->i_lru, &inode_unused);
> + inodes_stat.nr_unused++;
It's not obvious where this came from. How come nr_unused was
correctly accounted with the previous, list_move() version?
Miklos
> + }
> }
> }
> inode_sync_complete(inode);
> @@ -472,7 +476,7 @@
> while (!list_empty(&wb->b_io)) {
> long pages_skipped;
> struct inode *inode = list_entry(wb->b_io.prev,
> - struct inode, i_list);
> + struct inode, i_io);
>
> if (!spin_trylock(&inode->i_lock)) {
> spin_unlock(&wb_inode_list_lock);
> @@ -558,7 +562,7 @@
>
> while (!list_empty(&wb->b_io)) {
> struct inode *inode = list_entry(wb->b_io.prev,
> - struct inode, i_list);
> + struct inode, i_io);
> struct super_block *sb = inode->i_sb;
>
> if (!pin_sb_for_writeback(sb)) {
> @@ -703,7 +707,7 @@
> spin_lock(&wb_inode_list_lock);
> if (!list_empty(&wb->b_more_io)) {
> inode = list_entry(wb->b_more_io.prev,
> - struct inode, i_list);
> + struct inode, i_io);
> if (!spin_trylock(&inode->i_lock)) {
> spin_unlock(&wb_inode_list_lock);
> goto retry;
> @@ -1029,7 +1033,7 @@
>
> inode->dirtied_when = jiffies;
> spin_lock(&wb_inode_list_lock);
> - list_move(&inode->i_list, &bdi->wb.b_dirty);
> + list_move(&inode->i_io, &bdi->wb.b_dirty);
> spin_unlock(&wb_inode_list_lock);
> }
> }
> Index: linux-2.6/include/linux/fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/fs.h 2010-10-19 14:19:00.000000000 +1100
> +++ linux-2.6/include/linux/fs.h 2010-10-19 14:19:21.000000000 +1100
> @@ -727,7 +727,8 @@
>
> struct inode {
> struct hlist_bl_node i_hash;
> - struct list_head i_list; /* backing dev IO list */
> + struct list_head i_io; /* backing dev IO list */
> + struct list_head i_lru; /* inode LRU list */
> struct list_head i_sb_list;
> union {
> struct list_head i_dentry;
> Index: linux-2.6/mm/backing-dev.c
> ===================================================================
> --- linux-2.6.orig/mm/backing-dev.c 2010-10-19 14:18:59.000000000 +1100
> +++ linux-2.6/mm/backing-dev.c 2010-10-19 14:19:20.000000000 +1100
> @@ -74,11 +74,11 @@
>
> nr_wb = nr_dirty = nr_io = nr_more_io = 0;
> spin_lock(&wb_inode_list_lock);
> - list_for_each_entry(inode, &wb->b_dirty, i_list)
> + list_for_each_entry(inode, &wb->b_dirty, i_io)
> nr_dirty++;
> - list_for_each_entry(inode, &wb->b_io, i_list)
> + list_for_each_entry(inode, &wb->b_io, i_io)
> nr_io++;
> - list_for_each_entry(inode, &wb->b_more_io, i_list)
> + list_for_each_entry(inode, &wb->b_more_io, i_io)
> nr_more_io++;
> spin_unlock(&wb_inode_list_lock);
>
> Index: linux-2.6/fs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/inode.c 2010-10-19 14:19:00.000000000 +1100
> +++ linux-2.6/fs/inode.c 2010-10-19 14:19:21.000000000 +1100
> @@ -34,12 +34,13 @@
> * inode_hash_bucket lock protects:
> * inode hash table, i_hash
> * wb_inode_list_lock protects:
> - * inode_in_use, inode_unused, b_io, b_more_io, b_dirty, i_list
> + * inode_in_use, inode_unused, b_io, b_more_io, b_dirty, i_io, i_lru
> * inode->i_lock protects:
> * i_state
> * i_count
> * i_hash
> - * i_list
> + * i_io
> + * i_lru
> * i_sb_list
> *
> * Ordering:
> @@ -327,6 +328,7 @@
>
> void destroy_inode(struct inode *inode)
> {
> + BUG_ON(!list_empty(&inode->i_io));
> __destroy_inode(inode);
> if (inode->i_sb->s_op->destroy_inode)
> inode->i_sb->s_op->destroy_inode(inode);
> @@ -345,7 +347,8 @@
> INIT_HLIST_BL_NODE(&inode->i_hash);
> INIT_LIST_HEAD(&inode->i_dentry);
> INIT_LIST_HEAD(&inode->i_devices);
> - INIT_LIST_HEAD(&inode->i_list);
> + INIT_LIST_HEAD(&inode->i_io);
> + INIT_LIST_HEAD(&inode->i_lru);
> INIT_RADIX_TREE(&inode->i_data.page_tree, GFP_ATOMIC);
> spin_lock_init(&inode->i_data.tree_lock);
> spin_lock_init(&inode->i_data.i_mmap_lock);
> @@ -413,8 +416,8 @@
> while (!list_empty(head)) {
> struct inode *inode;
>
> - inode = list_first_entry(head, struct inode, i_list);
> - list_del_init(&inode->i_list);
> + inode = list_first_entry(head, struct inode, i_lru);
> + list_del_init(&inode->i_lru);
>
> evict(inode);
>
> @@ -445,13 +448,14 @@
> invalidate_inode_buffers(inode);
> if (!inode->i_count) {
> spin_lock(&wb_inode_list_lock);
> - list_del(&inode->i_list);
> + list_del_init(&inode->i_io);
> + list_del(&inode->i_lru);
> inodes_stat.nr_unused--;
> spin_unlock(&wb_inode_list_lock);
> WARN_ON(inode->i_state & I_NEW);
> inode->i_state |= I_FREEING;
> spin_unlock(&inode->i_lock);
> - list_add(&inode->i_list, dispose);
> + list_add(&inode->i_lru, dispose);
> continue;
> }
> spin_unlock(&inode->i_lock);
> @@ -530,20 +534,20 @@
> if (list_empty(&inode_unused))
> break;
>
> - inode = list_entry(inode_unused.prev, struct inode, i_list);
> + inode = list_entry(inode_unused.prev, struct inode, i_lru);
>
> if (!spin_trylock(&inode->i_lock)) {
> spin_unlock(&wb_inode_list_lock);
> goto again;
> }
> if (inode->i_count || (inode->i_state & ~I_REFERENCED)) {
> - list_del_init(&inode->i_list);
> + list_del_init(&inode->i_lru);
> spin_unlock(&inode->i_lock);
> inodes_stat.nr_unused--;
> continue;
> }
> if (inode->i_state & I_REFERENCED) {
> - list_move(&inode->i_list, &inode_unused);
> + list_move(&inode->i_lru, &inode_unused);
> inode->i_state &= ~I_REFERENCED;
> spin_unlock(&inode->i_lock);
> continue;
> @@ -556,7 +560,7 @@
> *
> * We'll try to get it back if it becomes freeable.
> */
> - list_move(&inode->i_list, &inode_unused);
> + list_move(&inode->i_lru, &inode_unused);
> spin_unlock(&wb_inode_list_lock);
> __iget(inode);
> spin_unlock(&inode->i_lock);
> @@ -567,7 +571,7 @@
> iput(inode);
> spin_lock(&wb_inode_list_lock);
> if (inode == list_entry(inode_unused.next,
> - struct inode, i_list)) {
> + struct inode, i_lru)) {
> if (spin_trylock(&inode->i_lock)) {
> if (can_unuse(inode))
> goto freeable;
> @@ -577,7 +581,7 @@
> continue;
> }
> freeable:
> - list_move(&inode->i_list, &freeable);
> + list_move(&inode->i_lru, &freeable);
> WARN_ON(inode->i_state & I_NEW);
> inode->i_state |= I_FREEING;
> spin_unlock(&inode->i_lock);
> @@ -1508,9 +1512,9 @@
> if (sb->s_flags & MS_ACTIVE) {
> inode->i_state |= I_REFERENCED;
> if (!(inode->i_state & (I_DIRTY|I_SYNC)) &&
> - list_empty(&inode->i_list)) {
> + list_empty(&inode->i_lru)) {
> spin_lock(&wb_inode_list_lock);
> - list_add(&inode->i_list, &inode_unused);
> + list_add(&inode->i_lru, &inode_unused);
> inodes_stat.nr_unused++;
> spin_unlock(&wb_inode_list_lock);
> }
> @@ -1526,11 +1530,15 @@
> inode->i_state &= ~I_WILL_FREE;
> __remove_inode_hash(inode);
> }
> - if (!list_empty(&inode->i_list)) {
> + if (!list_empty(&inode->i_lru)) {
> spin_lock(&wb_inode_list_lock);
> - list_del_init(&inode->i_list);
> - if (!inode->i_state)
> - inodes_stat.nr_unused--;
> + list_del_init(&inode->i_lru);
> + inodes_stat.nr_unused--;
> + spin_unlock(&wb_inode_list_lock);
> + }
> + if (!list_empty(&inode->i_io)) {
> + spin_lock(&wb_inode_list_lock);
> + list_del_init(&inode->i_io);
> spin_unlock(&wb_inode_list_lock);
> }
> inode_sb_list_del(inode);
> Index: linux-2.6/fs/nilfs2/mdt.c
> ===================================================================
> --- linux-2.6.orig/fs/nilfs2/mdt.c 2010-10-19 14:18:58.000000000 +1100
> +++ linux-2.6/fs/nilfs2/mdt.c 2010-10-19 14:19:16.000000000 +1100
> @@ -504,7 +504,8 @@
> #endif
> inode->dirtied_when = 0;
>
> - INIT_LIST_HEAD(&inode->i_list);
> + INIT_LIST_HEAD(&inode->i_io);
> + INIT_LIST_HEAD(&inode->i_lru);
> INIT_LIST_HEAD(&inode->i_sb_list);
> inode->i_state = 0;
> #endif
>
>
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