+ ocfs2-add-locking-filter-debugfs-file.patch added to -mm tree

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The patch titled
     Subject: ocfs2: add locking filter debugfs file
has been added to the -mm tree.  Its filename is
     ocfs2-add-locking-filter-debugfs-file.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-add-locking-filter-debugfs-file.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-add-locking-filter-debugfs-file.patch

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------------------------------------------------------
From: Gang He <ghe@xxxxxxxx>
Subject: ocfs2: add locking filter debugfs file

Add locking filter debugfs file, which is used to filter lock resources
dump from locking_state debugfs file.  We use d_filter_secs field to
filter lock resources dump, the default d_filter_secs(0) value filters
nothing, otherwise, only dump the last N seconds active lock resources. 
This enhancement can avoid dumping lots of old records.  The d_filter_secs
value can be changed via locking_filter file.

Link: http://lkml.kernel.org/r/20190611015414.27754-2-ghe@xxxxxxxx
Signed-off-by: Gang He <ghe@xxxxxxxx>
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>
Cc: Mark Fasheh <mark@xxxxxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Cc: Changwei Ge <gechangwei@xxxxxxx>
Cc: Gang He <ghe@xxxxxxxx>
Cc: Jun Piao <piaojun@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/ocfs2/dlmglue.c |   38 ++++++++++++++++++++++++++++++++++++++
 fs/ocfs2/ocfs2.h   |    2 ++
 2 files changed, 40 insertions(+)

--- a/fs/ocfs2/dlmglue.c~ocfs2-add-locking-filter-debugfs-file
+++ a/fs/ocfs2/dlmglue.c
@@ -2991,6 +2991,8 @@ struct ocfs2_dlm_debug *ocfs2_new_dlm_de
 	kref_init(&dlm_debug->d_refcnt);
 	INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
 	dlm_debug->d_locking_state = NULL;
+	dlm_debug->d_locking_filter = NULL;
+	dlm_debug->d_filter_secs = 0;
 out:
 	return dlm_debug;
 }
@@ -3090,10 +3092,34 @@ static int ocfs2_dlm_seq_show(struct seq
 	int i;
 	char *lvb;
 	struct ocfs2_lock_res *lockres = v;
+#ifdef CONFIG_OCFS2_FS_STATS
+	u64 now, last;
+	struct ocfs2_dlm_debug *dlm_debug =
+			((struct ocfs2_dlm_seq_priv *)m->private)->p_dlm_debug;
+#endif
 
 	if (!lockres)
 		return -EINVAL;
 
+#ifdef CONFIG_OCFS2_FS_STATS
+	if (dlm_debug->d_filter_secs) {
+		now = ktime_to_us(ktime_get_real());
+		if (lockres->l_lock_prmode.ls_last >
+		    lockres->l_lock_exmode.ls_last)
+			last = lockres->l_lock_prmode.ls_last;
+		else
+			last = lockres->l_lock_exmode.ls_last;
+		/*
+		 * Use d_filter_secs field to filter lock resources dump,
+		 * the default d_filter_secs(0) value filters nothing,
+		 * otherwise, only dump the last N seconds active lock
+		 * resources.
+		 */
+		if ((now - last) / 1000000 > dlm_debug->d_filter_secs)
+			return 0;
+	}
+#endif
+
 	seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
 
 	if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
@@ -3243,6 +3269,17 @@ static int ocfs2_dlm_init_debug(struct o
 		goto out;
 	}
 
+	dlm_debug->d_locking_filter = debugfs_create_u32("locking_filter",
+						0600,
+						osb->osb_debug_root,
+						&dlm_debug->d_filter_secs);
+	if (!dlm_debug->d_locking_filter) {
+		ret = -EINVAL;
+		mlog(ML_ERROR,
+		     "Unable to create locking filter debugfs file.\n");
+		goto out;
+	}
+
 	ocfs2_get_dlm_debug(dlm_debug);
 out:
 	return ret;
@@ -3254,6 +3291,7 @@ static void ocfs2_dlm_shutdown_debug(str
 
 	if (dlm_debug) {
 		debugfs_remove(dlm_debug->d_locking_state);
+		debugfs_remove(dlm_debug->d_locking_filter);
 		ocfs2_put_dlm_debug(dlm_debug);
 	}
 }
--- a/fs/ocfs2/ocfs2.h~ocfs2-add-locking-filter-debugfs-file
+++ a/fs/ocfs2/ocfs2.h
@@ -223,6 +223,8 @@ struct ocfs2_orphan_scan {
 struct ocfs2_dlm_debug {
 	struct kref d_refcnt;
 	struct dentry *d_locking_state;
+	struct dentry *d_locking_filter;
+	u32 d_filter_secs;
 	struct list_head d_lockres_tracking;
 };
 
_

Patches currently in -mm which might be from ghe@xxxxxxxx are

ocfs2-add-last-unlock-times-in-locking_state.patch
ocfs2-add-locking-filter-debugfs-file.patch
ocfs2-add-first-lock-wait-time-in-locking_state.patch




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