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authorChristoph Hellwig <hch@infradead.org>2011-04-24 19:06:17 +0000
committerAlex Elder <aelder@sgi.com>2011-04-28 13:18:09 -0500
commit8a072a4d4c6a5b6ec32836c467d2996393c76c6f (patch)
treeb21dad1310e4351854b9e2e24feb86beed20d1f7 /fs/xfs
parent97d3ac75e5e0ebf7ca38ae74cebd201c09b97ab2 (diff)
downloadop-kernel-dev-8a072a4d4c6a5b6ec32836c467d2996393c76c6f.zip
op-kernel-dev-8a072a4d4c6a5b6ec32836c467d2996393c76c6f.tar.gz
xfs: reduce the number of pagb_lock roundtrips in xfs_alloc_clear_busy
Instead of finding the per-ag and then taking and releasing the pagb_lock for every single busy extent completed sort the list of busy extents and only switch betweens AGs where nessecary. This becomes especially important with the online discard support which will hit this lock more often. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/linux-2.6/xfs_buf.c1
-rw-r--r--fs/xfs/linux-2.6/xfs_linux.h1
-rw-r--r--fs/xfs/xfs_alloc.c56
-rw-r--r--fs/xfs/xfs_alloc.h11
-rw-r--r--fs/xfs/xfs_log_cil.c5
-rw-r--r--fs/xfs/xfs_trans.c6
6 files changed, 61 insertions, 19 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 9ef9ed2..0988903 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -33,7 +33,6 @@
#include <linux/migrate.h>
#include <linux/backing-dev.h>
#include <linux/freezer.h>
-#include <linux/list_sort.h>
#include "xfs_sb.h"
#include "xfs_inum.h"
diff --git a/fs/xfs/linux-2.6/xfs_linux.h b/fs/xfs/linux-2.6/xfs_linux.h
index 244be9c..8633521 100644
--- a/fs/xfs/linux-2.6/xfs_linux.h
+++ b/fs/xfs/linux-2.6/xfs_linux.h
@@ -70,6 +70,7 @@
#include <linux/ctype.h>
#include <linux/writeback.h>
#include <linux/capability.h>
+#include <linux/list_sort.h>
#include <asm/page.h>
#include <asm/div64.h>
diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index 53157d4..44a51a7 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -2964,24 +2964,60 @@ fail:
*rlen = 0;
}
-void
-xfs_alloc_busy_clear(
+static void
+xfs_alloc_busy_clear_one(
struct xfs_mount *mp,
+ struct xfs_perag *pag,
struct xfs_busy_extent *busyp)
{
- struct xfs_perag *pag;
-
- list_del_init(&busyp->list);
-
- pag = xfs_perag_get(mp, busyp->agno);
- spin_lock(&pag->pagb_lock);
if (busyp->length) {
trace_xfs_alloc_busy_clear(mp, busyp->agno, busyp->bno,
busyp->length);
rb_erase(&busyp->rb_node, &pag->pagb_tree);
}
- spin_unlock(&pag->pagb_lock);
- xfs_perag_put(pag);
+ list_del_init(&busyp->list);
kmem_free(busyp);
}
+
+void
+xfs_alloc_busy_clear(
+ struct xfs_mount *mp,
+ struct list_head *list)
+{
+ struct xfs_busy_extent *busyp, *n;
+ struct xfs_perag *pag = NULL;
+ xfs_agnumber_t agno = NULLAGNUMBER;
+
+ list_for_each_entry_safe(busyp, n, list, list) {
+ if (busyp->agno != agno) {
+ if (pag) {
+ spin_unlock(&pag->pagb_lock);
+ xfs_perag_put(pag);
+ }
+ pag = xfs_perag_get(mp, busyp->agno);
+ spin_lock(&pag->pagb_lock);
+ agno = busyp->agno;
+ }
+
+ xfs_alloc_busy_clear_one(mp, pag, busyp);
+ }
+
+ if (pag) {
+ spin_unlock(&pag->pagb_lock);
+ xfs_perag_put(pag);
+ }
+}
+
+/*
+ * Callback for list_sort to sort busy extents by the AG they reside in.
+ */
+int
+xfs_busy_extent_ag_cmp(
+ void *priv,
+ struct list_head *a,
+ struct list_head *b)
+{
+ return container_of(a, struct xfs_busy_extent, list)->agno -
+ container_of(b, struct xfs_busy_extent, list)->agno;
+}
diff --git a/fs/xfs/xfs_alloc.h b/fs/xfs/xfs_alloc.h
index de5e27c..240ad28 100644
--- a/fs/xfs/xfs_alloc.h
+++ b/fs/xfs/xfs_alloc.h
@@ -140,7 +140,7 @@ xfs_alloc_busy_insert(struct xfs_trans *tp, xfs_agnumber_t agno,
xfs_agblock_t bno, xfs_extlen_t len);
void
-xfs_alloc_busy_clear(struct xfs_mount *mp, struct xfs_busy_extent *busyp);
+xfs_alloc_busy_clear(struct xfs_mount *mp, struct list_head *list);
int
xfs_alloc_busy_search(struct xfs_mount *mp, xfs_agnumber_t agno,
@@ -149,6 +149,15 @@ xfs_alloc_busy_search(struct xfs_mount *mp, xfs_agnumber_t agno,
void
xfs_alloc_busy_reuse(struct xfs_mount *mp, xfs_agnumber_t agno,
xfs_agblock_t fbno, xfs_extlen_t flen, bool userdata);
+
+int
+xfs_busy_extent_ag_cmp(void *priv, struct list_head *a, struct list_head *b);
+
+static inline void xfs_alloc_busy_sort(struct list_head *list)
+{
+ list_sort(NULL, list, xfs_busy_extent_ag_cmp);
+}
+
#endif /* __KERNEL__ */
/*
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index 9ca59be..7d56e88 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -361,13 +361,12 @@ xlog_cil_committed(
int abort)
{
struct xfs_cil_ctx *ctx = args;
- struct xfs_busy_extent *busyp, *n;
xfs_trans_committed_bulk(ctx->cil->xc_log->l_ailp, ctx->lv_chain,
ctx->start_lsn, abort);
- list_for_each_entry_safe(busyp, n, &ctx->busy_extents, list)
- xfs_alloc_busy_clear(ctx->cil->xc_log->l_mp, busyp);
+ xfs_alloc_busy_sort(&ctx->busy_extents);
+ xfs_alloc_busy_clear(ctx->cil->xc_log->l_mp, &ctx->busy_extents);
spin_lock(&ctx->cil->xc_cil_lock);
list_del(&ctx->committing);
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 7692279..d1f2485 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -608,10 +608,8 @@ STATIC void
xfs_trans_free(
struct xfs_trans *tp)
{
- struct xfs_busy_extent *busyp, *n;
-
- list_for_each_entry_safe(busyp, n, &tp->t_busy, list)
- xfs_alloc_busy_clear(tp->t_mountp, busyp);
+ xfs_alloc_busy_sort(&tp->t_busy);
+ xfs_alloc_busy_clear(tp->t_mountp, &tp->t_busy);
atomic_dec(&tp->t_mountp->m_active_trans);
xfs_trans_free_dqinfo(tp);
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