[PATCH 31/39] xfs: track CIL ticket reservation in percpu structure

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

To get it out from under the cil spinlock.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/xfs_log_cil.c  | 21 ++++++++++++++++-----
 fs/xfs/xfs_log_priv.h |  1 +
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index 620824c6f7fa..f5ce7099afc5 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -91,12 +91,17 @@ xlog_cil_pcp_aggregate(
 	for_each_online_cpu(cpu) {
 		cilpcp = per_cpu_ptr(cil->xc_pcp, cpu);
 
+		ctx->ticket->t_curr_res += cilpcp->space_reserved;
+		ctx->ticket->t_unit_res += cilpcp->space_reserved;
+		cilpcp->space_reserved = 0;
+
 		/*
 		 * We're in the middle of switching cil contexts.  Reset the
 		 * counter we use to detect when the current context is nearing
 		 * full.
 		 */
 		cilpcp->space_used = 0;
+
 	}
 }
 
@@ -516,6 +521,7 @@ xlog_cil_insert_items(
 	 * based on how close we are to the hard limit.
 	 */
 	cilpcp = get_cpu_ptr(cil->xc_pcp);
+	cilpcp->space_reserved += ctx_res;
 	cilpcp->space_used += len;
 	if (space_used >= XLOG_CIL_SPACE_LIMIT(log) ||
 	    cilpcp->space_used >
@@ -526,10 +532,6 @@ xlog_cil_insert_items(
 	}
 	put_cpu_ptr(cilpcp);
 
-	spin_lock(&cil->xc_cil_lock);
-	ctx->ticket->t_unit_res += ctx_res;
-	ctx->ticket->t_curr_res += ctx_res;
-
 	/*
 	 * If we've overrun the reservation, dump the tx details before we move
 	 * the log items. Shutdown is imminent...
@@ -551,6 +553,7 @@ xlog_cil_insert_items(
 	 * We do this here so we only need to take the CIL lock once during
 	 * the transaction commit.
 	 */
+	spin_lock(&cil->xc_cil_lock);
 	list_for_each_entry(lip, &tp->t_items, li_trans) {
 
 		/* Skip items which aren't dirty in this transaction. */
@@ -1439,12 +1442,20 @@ xlog_cil_pcp_dead(
 	spin_lock(&xlog_cil_pcp_lock);
 	list_for_each_entry_safe(cil, n, &xlog_cil_pcp_list, xc_pcp_list) {
 		struct xlog_cil_pcp	*cilpcp = per_cpu_ptr(cil->xc_pcp, cpu);
+		struct xfs_cil_ctx	*ctx;
 
 		spin_unlock(&xlog_cil_pcp_lock);
 		down_write(&cil->xc_ctx_lock);
+		ctx = cil->xc_ctx;
+
+		atomic_add(cilpcp->space_used, &ctx->space_used);
+		if (ctx->ticket) {
+			ctx->ticket->t_curr_res += cilpcp->space_reserved;
+			ctx->ticket->t_unit_res += cilpcp->space_reserved;
+		}
 
-		atomic_add(cilpcp->space_used, &cil->xc_ctx->space_used);
 		cilpcp->space_used = 0;
+		cilpcp->space_reserved = 0;
 
 		up_write(&cil->xc_ctx_lock);
 		spin_lock(&xlog_cil_pcp_lock);
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 373b7dbde4af..b80cb3a0edb7 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -232,6 +232,7 @@ struct xfs_cil_ctx {
  */
 struct xlog_cil_pcp {
 	uint32_t		space_used;
+	uint32_t		space_reserved;
 	struct list_head	busy_extents;
 	struct list_head	log_items;
 };
-- 
2.31.1