From: Christoph Hellwig Date: Mon, 20 Feb 2012 02:31:25 +0000 (+0000) Subject: xfs: add the xlog_grant_head structure X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=28496968a6ac37c8b8c44b5156e633c581bb8378;p=linux-beck.git xfs: add the xlog_grant_head structure Add a new data structure to allow sharing code between the log grant and regrant code. Reviewed-by: Mark Tinguely Signed-off-by: Christoph Hellwig Reviewed-by: Dave Chinner Signed-off-by: Ben Myers --- diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index 02a35fba5eae..ad0cac378e9a 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -158,7 +158,7 @@ xlog_reserveq_wake( struct xlog_ticket *tic; int need_bytes; - list_for_each_entry(tic, &log->l_reserveq, t_queue) { + list_for_each_entry(tic, &log->l_reserve_head.waiters, t_queue) { if (tic->t_flags & XLOG_TIC_PERM_RESERV) need_bytes = tic->t_unit_res * tic->t_cnt; else @@ -183,7 +183,7 @@ xlog_writeq_wake( struct xlog_ticket *tic; int need_bytes; - list_for_each_entry(tic, &log->l_writeq, t_queue) { + list_for_each_entry(tic, &log->l_write_head.waiters, t_queue) { ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); need_bytes = tic->t_unit_res; @@ -205,7 +205,7 @@ xlog_reserveq_wait( struct xlog_ticket *tic, int need_bytes) { - list_add_tail(&tic->t_queue, &log->l_reserveq); + list_add_tail(&tic->t_queue, &log->l_reserve_head.waiters); do { if (XLOG_FORCED_SHUTDOWN(log)) @@ -213,7 +213,7 @@ xlog_reserveq_wait( xlog_grant_push_ail(log, need_bytes); __set_current_state(TASK_UNINTERRUPTIBLE); - spin_unlock(&log->l_grant_reserve_lock); + spin_unlock(&log->l_reserve_head.lock); XFS_STATS_INC(xs_sleep_logspace); @@ -221,10 +221,10 @@ xlog_reserveq_wait( schedule(); trace_xfs_log_grant_wake(log, tic); - spin_lock(&log->l_grant_reserve_lock); + spin_lock(&log->l_reserve_head.lock); if (XLOG_FORCED_SHUTDOWN(log)) goto shutdown; - } while (xlog_space_left(log, &log->l_grant_reserve_head) < need_bytes); + } while (xlog_space_left(log, &log->l_reserve_head.grant) < need_bytes); list_del_init(&tic->t_queue); return 0; @@ -239,7 +239,7 @@ xlog_writeq_wait( struct xlog_ticket *tic, int need_bytes) { - list_add_tail(&tic->t_queue, &log->l_writeq); + list_add_tail(&tic->t_queue, &log->l_write_head.waiters); do { if (XLOG_FORCED_SHUTDOWN(log)) @@ -247,7 +247,7 @@ xlog_writeq_wait( xlog_grant_push_ail(log, need_bytes); __set_current_state(TASK_UNINTERRUPTIBLE); - spin_unlock(&log->l_grant_write_lock); + spin_unlock(&log->l_write_head.lock); XFS_STATS_INC(xs_sleep_logspace); @@ -255,10 +255,10 @@ xlog_writeq_wait( schedule(); trace_xfs_log_regrant_write_wake(log, tic); - spin_lock(&log->l_grant_write_lock); + spin_lock(&log->l_write_head.lock); if (XLOG_FORCED_SHUTDOWN(log)) goto shutdown; - } while (xlog_space_left(log, &log->l_grant_write_head) < need_bytes); + } while (xlog_space_left(log, &log->l_write_head.grant) < need_bytes); list_del_init(&tic->t_queue); return 0; @@ -779,22 +779,22 @@ xfs_log_space_wake( if (XLOG_FORCED_SHUTDOWN(log)) return; - if (!list_empty_careful(&log->l_writeq)) { + if (!list_empty_careful(&log->l_write_head.waiters)) { ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); - spin_lock(&log->l_grant_write_lock); - free_bytes = xlog_space_left(log, &log->l_grant_write_head); + spin_lock(&log->l_write_head.lock); + free_bytes = xlog_space_left(log, &log->l_write_head.grant); xlog_writeq_wake(log, &free_bytes); - spin_unlock(&log->l_grant_write_lock); + spin_unlock(&log->l_write_head.lock); } - if (!list_empty_careful(&log->l_reserveq)) { + if (!list_empty_careful(&log->l_reserve_head.waiters)) { ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); - spin_lock(&log->l_grant_reserve_lock); - free_bytes = xlog_space_left(log, &log->l_grant_reserve_head); + spin_lock(&log->l_reserve_head.lock); + free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); xlog_reserveq_wake(log, &free_bytes); - spin_unlock(&log->l_grant_reserve_lock); + spin_unlock(&log->l_reserve_head.lock); } } @@ -1070,12 +1070,12 @@ xlog_alloc_log(xfs_mount_t *mp, xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0); xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0); log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ - xlog_assign_grant_head(&log->l_grant_reserve_head, 1, 0); - xlog_assign_grant_head(&log->l_grant_write_head, 1, 0); - INIT_LIST_HEAD(&log->l_reserveq); - INIT_LIST_HEAD(&log->l_writeq); - spin_lock_init(&log->l_grant_reserve_lock); - spin_lock_init(&log->l_grant_write_lock); + xlog_assign_grant_head(&log->l_reserve_head.grant, 1, 0); + xlog_assign_grant_head(&log->l_write_head.grant, 1, 0); + INIT_LIST_HEAD(&log->l_reserve_head.waiters); + INIT_LIST_HEAD(&log->l_write_head.waiters); + spin_lock_init(&log->l_reserve_head.lock); + spin_lock_init(&log->l_write_head.lock); error = EFSCORRUPTED; if (xfs_sb_version_hassector(&mp->m_sb)) { @@ -1250,7 +1250,7 @@ xlog_grant_push_ail( ASSERT(BTOBB(need_bytes) < log->l_logBBsize); - free_bytes = xlog_space_left(log, &log->l_grant_reserve_head); + free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); free_blocks = BTOBBT(free_bytes); /* @@ -1382,8 +1382,8 @@ xlog_sync(xlog_t *log, roundoff < BBTOB(1))); /* move grant heads by roundoff in sync */ - xlog_grant_add_space(log, &log->l_grant_reserve_head, roundoff); - xlog_grant_add_space(log, &log->l_grant_write_head, roundoff); + xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff); + xlog_grant_add_space(log, &log->l_write_head.grant, roundoff); /* put cycle number in every block */ xlog_pack_data(log, iclog, roundoff); @@ -2547,8 +2547,8 @@ restart: * path. Hence any lock will be globally hot if we take it unconditionally on * every pass. * - * As tickets are only ever moved on and off the reserveq under the - * l_grant_reserve_lock, we only need to take that lock if we are going to add + * As tickets are only ever moved on and off the l_reserve.waiters under the + * l_reserve.lock, we only need to take that lock if we are going to add * the ticket to the queue and sleep. We can avoid taking the lock if the ticket * was never added to the reserveq because the t_queue list head will be empty * and we hold the only reference to it so it can safely be checked unlocked. @@ -2574,23 +2574,23 @@ xlog_grant_log_space( need_bytes = tic->t_unit_res; if (tic->t_flags & XFS_LOG_PERM_RESERV) need_bytes *= tic->t_ocnt; - free_bytes = xlog_space_left(log, &log->l_grant_reserve_head); - if (!list_empty_careful(&log->l_reserveq)) { - spin_lock(&log->l_grant_reserve_lock); + free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); + if (!list_empty_careful(&log->l_reserve_head.waiters)) { + spin_lock(&log->l_reserve_head.lock); if (!xlog_reserveq_wake(log, &free_bytes) || free_bytes < need_bytes) error = xlog_reserveq_wait(log, tic, need_bytes); - spin_unlock(&log->l_grant_reserve_lock); + spin_unlock(&log->l_reserve_head.lock); } else if (free_bytes < need_bytes) { - spin_lock(&log->l_grant_reserve_lock); + spin_lock(&log->l_reserve_head.lock); error = xlog_reserveq_wait(log, tic, need_bytes); - spin_unlock(&log->l_grant_reserve_lock); + spin_unlock(&log->l_reserve_head.lock); } if (error) return error; - xlog_grant_add_space(log, &log->l_grant_reserve_head, need_bytes); - xlog_grant_add_space(log, &log->l_grant_write_head, need_bytes); + xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes); + xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); trace_xfs_log_grant_exit(log, tic); xlog_verify_grant_tail(log); return 0; @@ -2627,23 +2627,23 @@ xlog_regrant_write_log_space( * otherwise try to get some space for this transaction. */ need_bytes = tic->t_unit_res; - free_bytes = xlog_space_left(log, &log->l_grant_write_head); - if (!list_empty_careful(&log->l_writeq)) { - spin_lock(&log->l_grant_write_lock); + free_bytes = xlog_space_left(log, &log->l_write_head.grant); + if (!list_empty_careful(&log->l_write_head.waiters)) { + spin_lock(&log->l_write_head.lock); if (!xlog_writeq_wake(log, &free_bytes) || free_bytes < need_bytes) error = xlog_writeq_wait(log, tic, need_bytes); - spin_unlock(&log->l_grant_write_lock); + spin_unlock(&log->l_write_head.lock); } else if (free_bytes < need_bytes) { - spin_lock(&log->l_grant_write_lock); + spin_lock(&log->l_write_head.lock); error = xlog_writeq_wait(log, tic, need_bytes); - spin_unlock(&log->l_grant_write_lock); + spin_unlock(&log->l_write_head.lock); } if (error) return error; - xlog_grant_add_space(log, &log->l_grant_write_head, need_bytes); + xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); trace_xfs_log_regrant_write_exit(log, tic); xlog_verify_grant_tail(log); return 0; @@ -2665,9 +2665,9 @@ xlog_regrant_reserve_log_space(xlog_t *log, if (ticket->t_cnt > 0) ticket->t_cnt--; - xlog_grant_sub_space(log, &log->l_grant_reserve_head, + xlog_grant_sub_space(log, &log->l_reserve_head.grant, ticket->t_curr_res); - xlog_grant_sub_space(log, &log->l_grant_write_head, + xlog_grant_sub_space(log, &log->l_write_head.grant, ticket->t_curr_res); ticket->t_curr_res = ticket->t_unit_res; xlog_tic_reset_res(ticket); @@ -2678,7 +2678,7 @@ xlog_regrant_reserve_log_space(xlog_t *log, if (ticket->t_cnt > 0) return; - xlog_grant_add_space(log, &log->l_grant_reserve_head, + xlog_grant_add_space(log, &log->l_reserve_head.grant, ticket->t_unit_res); trace_xfs_log_regrant_reserve_exit(log, ticket); @@ -2724,8 +2724,8 @@ xlog_ungrant_log_space(xlog_t *log, bytes += ticket->t_unit_res*ticket->t_cnt; } - xlog_grant_sub_space(log, &log->l_grant_reserve_head, bytes); - xlog_grant_sub_space(log, &log->l_grant_write_head, bytes); + xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes); + xlog_grant_sub_space(log, &log->l_write_head.grant, bytes); trace_xfs_log_ungrant_exit(log, ticket); @@ -3349,7 +3349,7 @@ xlog_verify_grant_tail( int tail_cycle, tail_blocks; int cycle, space; - xlog_crack_grant_head(&log->l_grant_write_head, &cycle, &space); + xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space); xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks); if (tail_cycle != cycle) { if (cycle - 1 != tail_cycle && @@ -3619,15 +3619,15 @@ xfs_log_force_umount( * we don't enqueue anything once the SHUTDOWN flag is set, and this * action is protected by the grant locks. */ - spin_lock(&log->l_grant_reserve_lock); - list_for_each_entry(tic, &log->l_reserveq, t_queue) + spin_lock(&log->l_reserve_head.lock); + list_for_each_entry(tic, &log->l_reserve_head.waiters, t_queue) wake_up_process(tic->t_task); - spin_unlock(&log->l_grant_reserve_lock); + spin_unlock(&log->l_reserve_head.lock); - spin_lock(&log->l_grant_write_lock); - list_for_each_entry(tic, &log->l_writeq, t_queue) + spin_lock(&log->l_write_head.lock); + list_for_each_entry(tic, &log->l_write_head.waiters, t_queue) wake_up_process(tic->t_task); - spin_unlock(&log->l_grant_write_lock); + spin_unlock(&log->l_write_head.lock); if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { ASSERT(!logerror); diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h index d8c5e47bbc2f..eba4ec925a45 100644 --- a/fs/xfs/xfs_log_priv.h +++ b/fs/xfs/xfs_log_priv.h @@ -469,6 +469,16 @@ struct xfs_cil { #define XLOG_CIL_SPACE_LIMIT(log) (log->l_logsize >> 3) #define XLOG_CIL_HARD_SPACE_LIMIT(log) (3 * (log->l_logsize >> 4)) +/* + * ticket grant locks, queues and accounting have their own cachlines + * as these are quite hot and can be operated on concurrently. + */ +struct xlog_grant_head { + spinlock_t lock ____cacheline_aligned_in_smp; + struct list_head waiters; + atomic64_t grant; +}; + /* * The reservation head lsn is not made up of a cycle number and block number. * Instead, it uses a cycle number and byte number. Logs don't expect to @@ -520,17 +530,8 @@ typedef struct log { /* lsn of 1st LR with unflushed * buffers */ atomic64_t l_tail_lsn ____cacheline_aligned_in_smp; - /* - * ticket grant locks, queues and accounting have their own cachlines - * as these are quite hot and can be operated on concurrently. - */ - spinlock_t l_grant_reserve_lock ____cacheline_aligned_in_smp; - struct list_head l_reserveq; - atomic64_t l_grant_reserve_head; - - spinlock_t l_grant_write_lock ____cacheline_aligned_in_smp; - struct list_head l_writeq; - atomic64_t l_grant_write_head; + struct xlog_grant_head l_reserve_head; + struct xlog_grant_head l_write_head; /* The following field are used for debugging; need to hold icloglock */ #ifdef DEBUG diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 8a3d8aedd1f4..7c75c7374d5a 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -965,9 +965,9 @@ xlog_find_tail( log->l_curr_cycle++; atomic64_set(&log->l_tail_lsn, be64_to_cpu(rhead->h_tail_lsn)); atomic64_set(&log->l_last_sync_lsn, be64_to_cpu(rhead->h_lsn)); - xlog_assign_grant_head(&log->l_grant_reserve_head, log->l_curr_cycle, + xlog_assign_grant_head(&log->l_reserve_head.grant, log->l_curr_cycle, BBTOB(log->l_curr_block)); - xlog_assign_grant_head(&log->l_grant_write_head, log->l_curr_cycle, + xlog_assign_grant_head(&log->l_write_head.grant, log->l_curr_cycle, BBTOB(log->l_curr_block)); /* diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index bb134a819930..a80e30854fce 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -782,12 +782,12 @@ DECLARE_EVENT_CLASS(xfs_loggrant_class, __entry->curr_res = tic->t_curr_res; __entry->unit_res = tic->t_unit_res; __entry->flags = tic->t_flags; - __entry->reserveq = list_empty(&log->l_reserveq); - __entry->writeq = list_empty(&log->l_writeq); - xlog_crack_grant_head(&log->l_grant_reserve_head, + __entry->reserveq = list_empty(&log->l_reserve_head.waiters); + __entry->writeq = list_empty(&log->l_write_head.waiters); + xlog_crack_grant_head(&log->l_reserve_head.grant, &__entry->grant_reserve_cycle, &__entry->grant_reserve_bytes); - xlog_crack_grant_head(&log->l_grant_write_head, + xlog_crack_grant_head(&log->l_write_head.grant, &__entry->grant_write_cycle, &__entry->grant_write_bytes); __entry->curr_cycle = log->l_curr_cycle;