This patch dumps all the tasks on the workqueue it can fit in one page
into a debugfs file. Useful for debugging.
Signed-off-by: Sunil Mushran <[EMAIL PROTECTED]>
---
fs/ocfs2/dlm/dlmdebug.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/dlm/dlmdebug.h | 1 +
2 files changed, 86 insertions(+), 0 deletions(-)
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index 25334a4..a05077b 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -794,6 +794,79 @@ static int debug_buffer_release(struct inode *inode,
struct file *file)
/* end - util funcs */
+/* begin - work queue funcs */
+static int debug_workqueue_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
+{
+ struct dlm_work_item *wi;
+ int out = 0;
+ unsigned long total = 0;
+
+ spin_lock(&dlm->work_lock);
+
+ list_for_each_entry(wi, &dlm->work_list, list) {
+ ++total;
+ if (db->len - out < 100)
+ continue;
+ if (wi->func == dlm_request_all_locks_worker) {
+ out += snprintf(db->buf + out, db->len - out,
+ "RequestAllLocks, "
+ "recomaster=%d, deadnode=%d\n",
+ wi->u.ral.reco_master,
+ wi->u.ral.dead_node);
+ } else if (wi->func == dlm_mig_lockres_worker) {
+ out += snprintf(db->buf + out, db->len - out,
+ "MigrateLockres, %.*s, master=%d\n",
+ wi->u.ml.lockres->lockname.len,
+ wi->u.ml.lockres->lockname.name,
+ wi->u.ml.real_master);
+ } else if (wi->func == dlm_assert_master_worker) {
+ out += snprintf(db->buf + out, db->len - out,
+ "AssertMaster, %.*s, "
+ "from=%d, flags=0x%X, ignore=%d\n",
+ wi->u.am.lockres->lockname.len,
+ wi->u.am.lockres->lockname.name,
+ wi->u.am.request_from,
+ wi->u.am.flags,
+ wi->u.am.ignore_higher);
+ } else {
+ out += snprintf(db->buf + out, db->len - out,
+ "Unknown, 0x%p\n", wi->func);
+ }
+ }
+ spin_unlock(&dlm->work_lock);
+
+ out += snprintf(db->buf + out, db->len - out,
+ "Total on list: %ld\n", total);
+
+ return out;
+}
+
+static int debug_workqueue_open(struct inode *inode, struct file *file)
+{
+ struct dlm_ctxt *dlm = inode->i_private;
+ struct debug_buffer *db;
+
+ db = debug_buffer_allocate();
+ if (!db)
+ goto bail;
+
+ db->len = debug_workqueue_print(dlm, db);
+
+ file->private_data = db;
+
+ return 0;
+bail:
+ return -ENOMEM;
+}
+
+static struct file_operations debug_workqueue_fops = {
+ .open = debug_workqueue_open,
+ .release = debug_buffer_release,
+ .read = debug_buffer_read,
+ .llseek = debug_buffer_llseek,
+};
+/* end - work queue funcs */
+
/* begin - purge list funcs */
static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
{
@@ -1349,6 +1422,16 @@ int dlm_debug_init(struct dlm_ctxt *dlm)
goto bail;
}
+ /* for dumping the dlm work queue */
+ dc->debug_workqueue_dentry =
+ debugfs_create_file("workqueue", S_IFREG|S_IRUSR,
+ dlm->dlm_debugfs_subroot,
+ dlm, &debug_workqueue_fops);
+ if (!dc->debug_workqueue_dentry) {
+ mlog_errno(-ENOMEM);
+ goto bail;
+ }
+
dlm_debug_get(dc);
return 0;
@@ -1362,6 +1445,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm)
struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
if (dc) {
+ if (dc->debug_workqueue_dentry)
+ debugfs_remove(dc->debug_workqueue_dentry);
if (dc->debug_purgelist_dentry)
debugfs_remove(dc->debug_purgelist_dentry);
if (dc->debug_mle_dentry)
diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h
index ca7bc32..fcc19c8 100644
--- a/fs/ocfs2/dlm/dlmdebug.h
+++ b/fs/ocfs2/dlm/dlmdebug.h
@@ -31,6 +31,7 @@ struct dlm_debug_ctxt {
struct dentry *debug_lockres_dentry;
struct dentry *debug_mle_dentry;
struct dentry *debug_purgelist_dentry;
+ struct dentry *debug_workqueue_dentry;
};
struct debug_buffer
--
1.5.2.5
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