diff options
Diffstat (limited to 'fs/xfs/xfs_log_priv.h')
| -rw-r--r-- | fs/xfs/xfs_log_priv.h | 93 |
1 files changed, 57 insertions, 36 deletions
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h index c6244cc733c..8952a392b5f 100644 --- a/fs/xfs/xfs_log_priv.h +++ b/fs/xfs/xfs_log_priv.h @@ -242,7 +242,7 @@ typedef struct xlog_res { typedef struct xlog_ticket { sv_t t_sema; /* sleep on this semaphore : 20 */ - struct xlog_ticket *t_next; /* :4|8 */ + struct xlog_ticket *t_next; /* :4|8 */ struct xlog_ticket *t_prev; /* :4|8 */ xlog_tid_t t_tid; /* transaction identifier : 4 */ int t_curr_res; /* current reservation in bytes : 4 */ @@ -324,6 +324,19 @@ typedef struct xlog_rec_ext_header { * - ic_offset is the current number of bytes written to in this iclog. * - ic_refcnt is bumped when someone is writing to the log. * - ic_state is the state of the iclog. + * + * Because of cacheline contention on large machines, we need to separate + * various resources onto different cachelines. To start with, make the + * structure cacheline aligned. The following fields can be contended on + * by independent processes: + * + * - ic_callback_* + * - ic_refcnt + * - fields protected by the global l_icloglock + * + * so we need to ensure that these fields are located in separate cachelines. + * We'll put all the read-only and l_icloglock fields in the first cacheline, + * and move everything else out to subsequent cachelines. */ typedef struct xlog_iclog_fields { sv_t ic_forcesema; @@ -332,17 +345,22 @@ typedef struct xlog_iclog_fields { struct xlog_in_core *ic_prev; struct xfs_buf *ic_bp; struct log *ic_log; - xfs_log_callback_t *ic_callback; - xfs_log_callback_t **ic_callback_tail; -#ifdef XFS_LOG_TRACE - struct ktrace *ic_trace; -#endif int ic_size; int ic_offset; - int ic_refcnt; int ic_bwritecnt; ushort_t ic_state; char *ic_datap; /* pointer to iclog data */ +#ifdef XFS_LOG_TRACE + struct ktrace *ic_trace; +#endif + + /* Callback structures need their own cacheline */ + spinlock_t ic_callback_lock ____cacheline_aligned_in_smp; + xfs_log_callback_t *ic_callback; + xfs_log_callback_t **ic_callback_tail; + + /* reference counts need their own cacheline */ + atomic_t ic_refcnt ____cacheline_aligned_in_smp; } xlog_iclog_fields_t; typedef union xlog_in_core2 { @@ -366,6 +384,7 @@ typedef struct xlog_in_core { #define ic_bp hic_fields.ic_bp #define ic_log hic_fields.ic_log #define ic_callback hic_fields.ic_callback +#define ic_callback_lock hic_fields.ic_callback_lock #define ic_callback_tail hic_fields.ic_callback_tail #define ic_trace hic_fields.ic_trace #define ic_size hic_fields.ic_size @@ -383,43 +402,46 @@ 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_ticket_cnt; /* free ticket count */ - int l_ticket_tcnt; /* total ticket count */ int l_covered_state;/* state of "covering disk * log entries" */ - xlog_ticket_t *l_freelist; /* free list of tickets */ - xlog_ticket_t *l_unmount_free;/* kmem_free these addresses */ - xlog_ticket_t *l_tail; /* free list of tickets */ xlog_in_core_t *l_iclog; /* head log queue */ spinlock_t l_icloglock; /* grab to change iclog state */ 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; @@ -427,19 +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) @@ -459,6 +478,8 @@ extern struct xfs_buf *xlog_get_bp(xlog_t *, int); extern void xlog_put_bp(struct xfs_buf *); extern int xlog_bread(xlog_t *, xfs_daddr_t, int, struct xfs_buf *); +extern kmem_zone_t *xfs_log_ticket_zone; + /* iclog tracing */ #define XLOG_TRACE_GRAB_FLUSH 1 #define XLOG_TRACE_REL_FLUSH 2 |