ocfs2: revert iput deferring code in ocfs2_drop_dentry_lock
The following patches are reverted in this patch because these patches
caused performance regression in the remote unlink() calls.
ea455f8ab683 - ocfs2: Push out dropping of dentry lock to ocfs2_wq
f7b1aa69be13 - ocfs2: Fix deadlock on umount
5fd131893793 - ocfs2: Don't oops in ocfs2_kill_sb on a failed mount
Previous patches in this series removed the possible deadlocks from
downconvert thread so the above patches shouldn't be needed anymore.
The regression is caused because these patches delay the iput() in case
of dentry unlocks. This also delays the unlocking of the open lockres.
The open lockresource is required to test if the inode can be wiped from
disk or not. When the deleting node does not get the open lock, it
marks it as orphan (even though it is not in use by another
node/process) and causes a journal checkpoint. This delays operations
following the inode eviction. This also moves the inode to the orphaned
inode which further causes more I/O and a lot of unneccessary orphans.
The following script can be used to generate the load causing issues:
declare -a create
declare -a remove
declare -a iterations=(1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384)
unique="`mktemp -u XXXXX`"
script="/tmp/idontknow-${unique}.sh"
cat <<EOF > "${script}"
for n in {1..8}; do mkdir -p test/dir\${n}
eval touch test/dir\${n}/foo{1.."\$1"}
done
EOF
chmod 700 "${script}"
function fcreate ()
{
exec 2>&1 /usr/bin/time --format=%E "${script}" "$1"
}
function fremove ()
{
exec 2>&1 /usr/bin/time --format=%E ssh node2 "cd `pwd`; rm -Rf test*"
}
function fcp ()
{
exec 2>&1 /usr/bin/time --format=%E ssh node3 "cd `pwd`; cp -R test test.new"
}
echo -------------------------------------------------
echo "| # files | create #s | copy #s | remove #s |"
echo -------------------------------------------------
for ((x=0; x < ${#iterations[*]} ; x++)) do
create[$x]="`fcreate ${iterations[$x]}`"
copy[$x]="`fcp ${iterations[$x]}`"
remove[$x]="`fremove`"
printf "| %8d | %9s | %9s | %9s |\n" ${iterations[$x]} ${create[$x]} ${copy[$x]} ${remove[$x]}
done
rm "${script}"
echo "------------------------"
Signed-off-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 64c0223..a780e20 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -275,19 +275,16 @@
OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
};
-#define OCFS2_OSB_SOFT_RO 0x0001
-#define OCFS2_OSB_HARD_RO 0x0002
-#define OCFS2_OSB_ERROR_FS 0x0004
-#define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008
-
-#define OCFS2_DEFAULT_ATIME_QUANTUM 60
+#define OCFS2_OSB_SOFT_RO 0x0001
+#define OCFS2_OSB_HARD_RO 0x0002
+#define OCFS2_OSB_ERROR_FS 0x0004
+#define OCFS2_DEFAULT_ATIME_QUANTUM 60
struct ocfs2_journal;
struct ocfs2_slot_info;
struct ocfs2_recovery_map;
struct ocfs2_replay_map;
struct ocfs2_quota_recovery;
-struct ocfs2_dentry_lock;
struct ocfs2_super
{
struct task_struct *commit_task;
@@ -415,11 +412,6 @@
struct list_head blocked_lock_list;
unsigned long blocked_lock_count;
- /* List of dentry locks to release. Anyone can add locks to
- * the list, ocfs2_wq processes the list */
- struct ocfs2_dentry_lock *dentry_lock_list;
- struct work_struct dentry_lock_work;
-
/* List of dquot structures to drop last reference to */
struct llist_head dquot_drop_list;
struct work_struct dquot_drop_work;
@@ -584,18 +576,6 @@
spin_unlock(&osb->osb_lock);
}
-
-static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb,
- unsigned long flag)
-{
- unsigned long ret;
-
- spin_lock(&osb->osb_lock);
- ret = osb->osb_flags & flag;
- spin_unlock(&osb->osb_lock);
- return ret;
-}
-
static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
int hard)
{