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.
Compared with v3, I need to do the related change since last
lock/unlock uses wall time in microsecond. secondly, adjust
CONFIG_OCFS2_FS_STATS macro positions.
Compared with v2, ocfs2_dlm_init_debug() returns directly with
error when creating locking filter debugfs file is failed, since
ocfs2_dlm_shutdown_debug() will handle this failure perfectly.
Compared with v1, the main change is to add CONFIG_OCFS2_FS_STATS
macro definition judgment.
Signed-off-by: Gang He <g...@suse.com>
Reviewed-by: Joseph Qi <joseph...@linux.alibaba.com>
---
fs/ocfs2/dlmglue.c | 38 ++++++++++++++++++++++++++++++++++++++
fs/ocfs2/ocfs2.h | 2 ++
2 files changed, 40 insertions(+)
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 3b0e7d399df2..d4caa6d117c6 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -3005,6 +3005,8 @@ struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
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;
}
@@ -3104,10 +3106,34 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void
*v)
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)
@@ -3257,6 +3283,17 @@ static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
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;
@@ -3268,6 +3305,7 @@ static void ocfs2_dlm_shutdown_debug(struct ocfs2_super
*osb)
if (dlm_debug) {
debugfs_remove(dlm_debug->d_locking_state);
+ debugfs_remove(dlm_debug->d_locking_filter);
ocfs2_put_dlm_debug(dlm_debug);
}
}
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 6f43651f01b3..6d0a77703d0e 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -237,6 +237,8 @@ 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;
};
--
2.21.0
