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[XFS] On machines with more than 8 cpus, when running parallel I/O

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threads, the incore superblock lock becomes the limiting factor for
buffered write throughput. Make the contended fields in the incore
superblock use per-cpu counters so that there is no global lock to limit
scalability.

SGI-PV: 946630
SGI-Modid: xfs-linux-melb:xfs-kern:25106a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
David Chinner
2006-03-14 13:13:09 +11:00
committed by Nathan Scott
parent 9f4cbecd7e
commit 8d280b98cf
5 changed files with 586 additions and 17 deletions
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34
fs/xfs/xfs_mount.h
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@@ -267,6 +267,32 @@ typedef struct xfs_ioops {
#define XFS_IODONE(vfsp) \
(*(mp)->m_io_ops.xfs_iodone)(vfsp)
#ifdef HAVE_PERCPU_SB
/*
* Valid per-cpu incore superblock counters. Note that if you add new counters,
* you may need to define new counter disabled bit field descriptors as there
* are more possible fields in the superblock that can fit in a bitfield on a
* 32 bit platform. The XFS_SBS_* values for the current current counters just
* fit.
*/
typedef struct xfs_icsb_cnts {
uint64_t icsb_fdblocks;
uint64_t icsb_ifree;
uint64_t icsb_icount;
spinlock_t icsb_lock;
} xfs_icsb_cnts_t;
#define XFS_ICSB_SB_LOCKED (1 << 0) /* sb already locked */
#define XFS_ICSB_LAZY_COUNT (1 << 1) /* accuracy not needed */
extern int xfs_icsb_init_counters(struct xfs_mount *);
extern void xfs_icsb_sync_counters_lazy(struct xfs_mount *);
#else
#define xfs_icsb_init_counters(mp) (0)
#define xfs_icsb_sync_counters_lazy(mp) do { } while (0)
#endif
typedef struct xfs_mount {
bhv_desc_t m_bhv; /* vfs xfs behavior */
@@ -372,6 +398,10 @@ typedef struct xfs_mount {
struct xfs_qmops m_qm_ops; /* vector of XQM ops */
struct xfs_ioops m_io_ops; /* vector of I/O ops */
atomic_t m_active_trans; /* number trans frozen */
#ifdef HAVE_PERCPU_SB
xfs_icsb_cnts_t *m_sb_cnts; /* per-cpu superblock counters */
unsigned long m_icsb_counters; /* disabled per-cpu counters */
#endif
} xfs_mount_t;
/*
@@ -409,6 +439,8 @@ typedef struct xfs_mount {
#define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
* I/O size in stat() */
#define XFS_MOUNT_NO_PERCPU_SB (1ULL << 23) /* don't use per-cpu superblock
counters */
/*
@@ -546,6 +578,8 @@ extern void xfs_unmountfs_close(xfs_mount_t *, struct cred *);
extern int xfs_unmountfs_writesb(xfs_mount_t *);
extern int xfs_unmount_flush(xfs_mount_t *, int);
extern int xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int, int);
extern int xfs_mod_incore_sb_unlocked(xfs_mount_t *, xfs_sb_field_t,
int, int);
extern int xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
uint, int);
extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);