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[XFS] Reorganise xlog_t for better cacheline isolation of contention 

To reduce contention on the log in large CPU count, separate out different
parts of the xlog_t structure onto different cachelines. Move each lock
onto a different cacheline along with all the members that are
accessed/modified while that lock is held.

Also, move the debugging code into debug code.

SGI-PV: 978729
SGI-Modid: xfs-linux-melb:xfs-kern:30772a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
David Chinner 2008-04-10 12:18:54 +10:00 committed by Lachlan McIlroy
parent eb01c9cd87
commit 4679b2d36d
2 changed files with 32 additions and 28 deletions
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5
fs/xfs/xfs_log.c
View File

@ -1237,9 +1237,9 @@ xlog_alloc_log(xfs_mount_t *mp,
XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
iclog->ic_bp = bp;
iclog->hic_data = bp->b_addr;
#ifdef DEBUG
log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header);
#endif
head = &iclog->ic_header;
memset(head, 0, sizeof(xlog_rec_header_t));
head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
@ -1250,7 +1250,6 @@ xlog_alloc_log(xfs_mount_t *mp,
head->h_fmt = cpu_to_be32(XLOG_FMT);
memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t));
iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize;
iclog->ic_state = XLOG_STATE_ACTIVE;
iclog->ic_log = log;

55
fs/xfs/xfs_log_priv.h
View File

@ -361,7 +361,7 @@ typedef struct xlog_iclog_fields {
/* reference counts need their own cacheline */
atomic_t ic_refcnt ____cacheline_aligned_in_smp;
} xlog_iclog_fields_t ____cacheline_aligned_in_smp;
} xlog_iclog_fields_t;
typedef union xlog_in_core2 {
xlog_rec_header_t hic_header;
@ -402,8 +402,29 @@ typedef struct xlog_in_core {
* that round off problems won't occur when releasing partial reservations.
*/
typedef struct log {
/* The following fields don't need locking */
struct xfs_mount *l_mp; /* mount point */
struct xfs_buf *l_xbuf; /* extra buffer for log
* wrapping */
struct xfs_buftarg *l_targ; /* buftarg of log */
uint l_flags;
uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */
struct xfs_buf_cancel **l_buf_cancel_table;
int l_iclog_hsize; /* size of iclog header */
int l_iclog_heads; /* # of iclog header sectors */
uint l_sectbb_log; /* log2 of sector size in BBs */
uint l_sectbb_mask; /* sector size (in BBs)
* alignment mask */
int l_iclog_size; /* size of log in bytes */
int l_iclog_size_log; /* log power size of log */
int l_iclog_bufs; /* number of iclog buffers */
xfs_daddr_t l_logBBstart; /* start block of log */
int l_logsize; /* size of log in bytes */
int l_logBBsize; /* size of log in BB chunks */
/* The following block of fields are changed while holding icloglock */
sema_t l_flushsema; /* iclog flushing semaphore */
sema_t l_flushsema ____cacheline_aligned_in_smp;
/* iclog flushing semaphore */
int l_flushcnt; /* # of procs waiting on this
* sema */
int l_covered_state;/* state of "covering disk
@ -413,27 +434,14 @@ typedef struct log {
xfs_lsn_t l_tail_lsn; /* lsn of 1st LR with unflushed
* buffers */
xfs_lsn_t l_last_sync_lsn;/* lsn of last LR on disk */
struct xfs_mount *l_mp; /* mount point */
struct xfs_buf *l_xbuf; /* extra buffer for log
* wrapping */
struct xfs_buftarg *l_targ; /* buftarg of log */
xfs_daddr_t l_logBBstart; /* start block of log */
int l_logsize; /* size of log in bytes */
int l_logBBsize; /* size of log in BB chunks */
int l_curr_cycle; /* Cycle number of log writes */
int l_prev_cycle; /* Cycle number before last
* block increment */
int l_curr_block; /* current logical log block */
int l_prev_block; /* previous logical log block */
int l_iclog_size; /* size of log in bytes */
int l_iclog_size_log; /* log power size of log */
int l_iclog_bufs; /* number of iclog buffers */
/* The following field are used for debugging; need to hold icloglock */
char *l_iclog_bak[XLOG_MAX_ICLOGS];
/* The following block of fields are changed while holding grant_lock */
spinlock_t l_grant_lock;
spinlock_t l_grant_lock ____cacheline_aligned_in_smp;
xlog_ticket_t *l_reserve_headq;
xlog_ticket_t *l_write_headq;
int l_grant_reserve_cycle;
@ -441,19 +449,16 @@ typedef struct log {
int l_grant_write_cycle;
int l_grant_write_bytes;
/* The following fields don't need locking */
#ifdef XFS_LOG_TRACE
struct ktrace *l_trace;
struct ktrace *l_grant_trace;
#endif
uint l_flags;
uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */
struct xfs_buf_cancel **l_buf_cancel_table;
int l_iclog_hsize; /* size of iclog header */
int l_iclog_heads; /* # of iclog header sectors */
uint l_sectbb_log; /* log2 of sector size in BBs */
uint l_sectbb_mask; /* sector size (in BBs)
* alignment mask */
/* The following field are used for debugging; need to hold icloglock */
#ifdef DEBUG
char *l_iclog_bak[XLOG_MAX_ICLOGS];
#endif
} xlog_t;
#define XLOG_FORCED_SHUTDOWN(log) ((log)->l_flags & XLOG_IO_ERROR)