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linux/fs/xfs/xfs_ag.h
Dave Chinner 74f75a0cb7 xfs: convert buffer cache hash to rbtree 
The buffer cache hash is showing typical hash scalability problems.
In large scale testing the number of cached items growing far larger
than the hash can efficiently handle. Hence we need to move to a
self-scaling cache indexing mechanism.

I have selected rbtrees for indexing becuse they can have O(log n)
search scalability, and insert and remove cost is not excessive,
even on large trees. Hence we should be able to cache large numbers
of buffers without incurring the excessive cache miss search
penalties that the hash is imposing on us.

To ensure we still have parallel access to the cache, we need
multiple trees. Rather than hashing the buffers by disk address to
select a tree, it seems more sensible to separate trees by typical
access patterns. Most operations use buffers from within a single AG
at a time, so rather than searching lots of different lists,
separate the buffer indexes out into per-AG rbtrees. This means that
searches during metadata operation have a much higher chance of
hitting cache resident nodes, and that updates of the tree are less
likely to disturb trees being accessed on other CPUs doing
independent operations.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
2010-10-18 15:07:56 -05:00

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/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_AG_H__
#define __XFS_AG_H__
/*
* Allocation group header
* This is divided into three structures, placed in sequential 512-byte
* buffers after a copy of the superblock (also in a 512-byte buffer).
*/
struct xfs_buf;
struct xfs_mount;
struct xfs_trans;
#define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
#define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
#define XFS_AGF_VERSION 1
#define XFS_AGI_VERSION 1
#define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
#define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
/*
* Btree number 0 is bno, 1 is cnt. This value gives the size of the
* arrays below.
*/
#define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1)
/*
* The second word of agf_levels in the first a.g. overlaps the EFS
* superblock's magic number. Since the magic numbers valid for EFS
* are > 64k, our value cannot be confused for an EFS superblock's.
*/
typedef struct xfs_agf {
/*
* Common allocation group header information
*/
__be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
__be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
__be32 agf_seqno; /* sequence # starting from 0 */
__be32 agf_length; /* size in blocks of a.g. */
/*
* Freespace information
*/
__be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */
__be32 agf_spare0; /* spare field */
__be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */
__be32 agf_spare1; /* spare field */
__be32 agf_flfirst; /* first freelist block's index */
__be32 agf_fllast; /* last freelist block's index */
__be32 agf_flcount; /* count of blocks in freelist */
__be32 agf_freeblks; /* total free blocks */
__be32 agf_longest; /* longest free space */
__be32 agf_btreeblks; /* # of blocks held in AGF btrees */
} xfs_agf_t;
#define XFS_AGF_MAGICNUM 0x00000001
#define XFS_AGF_VERSIONNUM 0x00000002
#define XFS_AGF_SEQNO 0x00000004
#define XFS_AGF_LENGTH 0x00000008
#define XFS_AGF_ROOTS 0x00000010
#define XFS_AGF_LEVELS 0x00000020
#define XFS_AGF_FLFIRST 0x00000040
#define XFS_AGF_FLLAST 0x00000080
#define XFS_AGF_FLCOUNT 0x00000100
#define XFS_AGF_FREEBLKS 0x00000200
#define XFS_AGF_LONGEST 0x00000400
#define XFS_AGF_BTREEBLKS 0x00000800
#define XFS_AGF_NUM_BITS 12
#define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
#define XFS_AGF_FLAGS \
{ XFS_AGF_MAGICNUM, "MAGICNUM" }, \
{ XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
{ XFS_AGF_SEQNO, "SEQNO" }, \
{ XFS_AGF_LENGTH, "LENGTH" }, \
{ XFS_AGF_ROOTS, "ROOTS" }, \
{ XFS_AGF_LEVELS, "LEVELS" }, \
{ XFS_AGF_FLFIRST, "FLFIRST" }, \
{ XFS_AGF_FLLAST, "FLLAST" }, \
{ XFS_AGF_FLCOUNT, "FLCOUNT" }, \
{ XFS_AGF_FREEBLKS, "FREEBLKS" }, \
{ XFS_AGF_LONGEST, "LONGEST" }, \
{ XFS_AGF_BTREEBLKS, "BTREEBLKS" }
/* disk block (xfs_daddr_t) in the AG */
#define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
#define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
#define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)XFS_BUF_PTR(bp))
extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
/*
* Size of the unlinked inode hash table in the agi.
*/
#define XFS_AGI_UNLINKED_BUCKETS 64
typedef struct xfs_agi {
/*
* Common allocation group header information
*/
__be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
__be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
__be32 agi_seqno; /* sequence # starting from 0 */
__be32 agi_length; /* size in blocks of a.g. */
/*
* Inode information
* Inodes are mapped by interpreting the inode number, so no
* mapping data is needed here.
*/
__be32 agi_count; /* count of allocated inodes */
__be32 agi_root; /* root of inode btree */
__be32 agi_level; /* levels in inode btree */
__be32 agi_freecount; /* number of free inodes */
__be32 agi_newino; /* new inode just allocated */
__be32 agi_dirino; /* last directory inode chunk */
/*
* Hash table of inodes which have been unlinked but are
* still being referenced.
*/
__be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
} xfs_agi_t;
#define XFS_AGI_MAGICNUM 0x00000001
#define XFS_AGI_VERSIONNUM 0x00000002
#define XFS_AGI_SEQNO 0x00000004
#define XFS_AGI_LENGTH 0x00000008
#define XFS_AGI_COUNT 0x00000010
#define XFS_AGI_ROOT 0x00000020
#define XFS_AGI_LEVEL 0x00000040
#define XFS_AGI_FREECOUNT 0x00000080
#define XFS_AGI_NEWINO 0x00000100
#define XFS_AGI_DIRINO 0x00000200
#define XFS_AGI_UNLINKED 0x00000400
#define XFS_AGI_NUM_BITS 11
#define XFS_AGI_ALL_BITS ((1 << XFS_AGI_NUM_BITS) - 1)
/* disk block (xfs_daddr_t) in the AG */
#define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
#define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
#define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)XFS_BUF_PTR(bp))
extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
xfs_agnumber_t agno, struct xfs_buf **bpp);
/*
* The third a.g. block contains the a.g. freelist, an array
* of block pointers to blocks owned by the allocation btree code.
*/
#define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
#define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
#define XFS_AGFL_SIZE(mp) ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t))
#define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)XFS_BUF_PTR(bp))
typedef struct xfs_agfl {
__be32 agfl_bno[1]; /* actually XFS_AGFL_SIZE(mp) */
} xfs_agfl_t;
/*
* Busy block/extent entry. Indexed by a rbtree in perag to mark blocks that
* have been freed but whose transactions aren't committed to disk yet.
*
* Note that we use the transaction ID to record the transaction, not the
* transaction structure itself. See xfs_alloc_busy_insert() for details.
*/
struct xfs_busy_extent {
struct rb_node rb_node; /* ag by-bno indexed search tree */
struct list_head list; /* transaction busy extent list */
xfs_agnumber_t agno;
xfs_agblock_t bno;
xfs_extlen_t length;
xlog_tid_t tid; /* transaction that created this */
};
/*
* Per-ag incore structure, copies of information in agf and agi,
* to improve the performance of allocation group selection.
*/
#define XFS_PAGB_NUM_SLOTS 128
typedef struct xfs_perag {
struct xfs_mount *pag_mount; /* owner filesystem */
xfs_agnumber_t pag_agno; /* AG this structure belongs to */
atomic_t pag_ref; /* perag reference count */
char pagf_init; /* this agf's entry is initialized */
char pagi_init; /* this agi's entry is initialized */
char pagf_metadata; /* the agf is preferred to be metadata */
char pagi_inodeok; /* The agi is ok for inodes */
__uint8_t pagf_levels[XFS_BTNUM_AGF];
/* # of levels in bno & cnt btree */
__uint32_t pagf_flcount; /* count of blocks in freelist */
xfs_extlen_t pagf_freeblks; /* total free blocks */
xfs_extlen_t pagf_longest; /* longest free space */
__uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
xfs_agino_t pagi_freecount; /* number of free inodes */
xfs_agino_t pagi_count; /* number of allocated inodes */
/*
* Inode allocation search lookup optimisation.
* If the pagino matches, the search for new inodes
* doesn't need to search the near ones again straight away
*/
xfs_agino_t pagl_pagino;
xfs_agino_t pagl_leftrec;
xfs_agino_t pagl_rightrec;
#ifdef __KERNEL__
spinlock_t pagb_lock; /* lock for pagb_tree */
struct rb_root pagb_tree; /* ordered tree of busy extents */
atomic_t pagf_fstrms; /* # of filestreams active in this AG */
rwlock_t pag_ici_lock; /* incore inode lock */
struct radix_tree_root pag_ici_root; /* incore inode cache root */
int pag_ici_reclaimable; /* reclaimable inodes */
struct mutex pag_ici_reclaim_lock; /* serialisation point */
unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
/* buffer cache index */
spinlock_t pag_buf_lock; /* lock for pag_buf_tree */
struct rb_root pag_buf_tree; /* ordered tree of active buffers */
/* for rcu-safe freeing */
struct rcu_head rcu_head;
#endif
int pagb_count; /* pagb slots in use */
} xfs_perag_t;
/*
* tags for inode radix tree
*/
#define XFS_ICI_NO_TAG (-1) /* special flag for an untagged lookup
in xfs_inode_ag_iterator */
#define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */
#define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels)
#define XFS_MIN_FREELIST_RAW(bl,cl,mp) \
(MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
#define XFS_MIN_FREELIST(a,mp) \
(XFS_MIN_FREELIST_RAW( \
be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \
be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp))
#define XFS_MIN_FREELIST_PAG(pag,mp) \
(XFS_MIN_FREELIST_RAW( \
(unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
(unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))
#define XFS_AGB_TO_FSB(mp,agno,agbno) \
(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
#define XFS_FSB_TO_AGNO(mp,fsbno) \
((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
#define XFS_FSB_TO_AGBNO(mp,fsbno) \
((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
#define XFS_AGB_TO_DADDR(mp,agno,agbno) \
((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
(xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
/*
* For checking for bad ranges of xfs_daddr_t's, covering multiple
* allocation groups or a single xfs_daddr_t that's a superblock copy.
*/
#define XFS_AG_CHECK_DADDR(mp,d,len) \
((len) == 1 ? \
ASSERT((d) == XFS_SB_DADDR || \
xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
ASSERT(xfs_daddr_to_agno(mp, d) == \
xfs_daddr_to_agno(mp, (d) + (len) - 1)))
#endif /* __XFS_AG_H__ */
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