dlm: change lock time stamping

Use ktime instead of jiffies for timestamping lkb's.  Also stamp the
time on every lkb whenever it's added to a resource queue, instead of
just stamping locks subject to timeouts.  This will allow us to use
timestamps more widely for debugging all locks.

Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 8fc24f4..19e4f9e 100644 (file)
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -162,21 +162,21 @@ static int print_resource(struct dlm_rsb *res, struct seq_file *s)
 
 static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *r)
 {
-       unsigned int waiting = 0;
-       uint64_t xid = 0;
+       u64 xid = 0;
+       u64 us;
 
        if (lkb->lkb_flags & DLM_IFL_USER) {
                if (lkb->lkb_ua)
                        xid = lkb->lkb_ua->xid;
        }
 
-       if (lkb->lkb_timestamp)
-               waiting = jiffies_to_msecs(jiffies - lkb->lkb_timestamp);
+       /* microseconds since lkb was added to current queue */
+       us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
 
-       /* id nodeid remid pid xid exflags flags sts grmode rqmode time_ms
+       /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
           r_nodeid r_len r_name */
 
-       seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %u %u %d \"%s\"\n",
+       seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
                   lkb->lkb_id,
                   lkb->lkb_nodeid,
                   lkb->lkb_remid,
@@ -187,7 +187,7 @@ static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *
                   lkb->lkb_status,
                   lkb->lkb_grmode,
                   lkb->lkb_rqmode,
-                  waiting,
+                  (unsigned long long)us,
                   r->res_nodeid,
                   r->res_length,
                   r->res_name);

diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 868e4c9..e69135c 100644 (file)
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -245,7 +245,7 @@ struct dlm_lkb {
        struct list_head        lkb_astqueue;   /* need ast to be sent */
        struct list_head        lkb_ownqueue;   /* list of locks for a process */
        struct list_head        lkb_time_list;
-       unsigned long           lkb_timestamp;
+       ktime_t                 lkb_timestamp;
        unsigned long           lkb_timeout_cs;
 
        char                    *lkb_lvbptr;

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 7b758da..dfc57ae 100644 (file)
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -742,6 +742,8 @@ static void add_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int status)
 
        DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb););
 
+       lkb->lkb_timestamp = ktime_get();
+
        lkb->lkb_status = status;
 
        switch (status) {
@@ -1011,10 +1013,8 @@ static void add_timeout(struct dlm_lkb *lkb)
 {
        struct dlm_ls *ls = lkb->lkb_resource->res_ls;
 
-       if (is_master_copy(lkb)) {
-               lkb->lkb_timestamp = jiffies;
+       if (is_master_copy(lkb))
                return;
-       }
 
        if (test_bit(LSFL_TIMEWARN, &ls->ls_flags) &&
            !(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) {
@@ -1029,7 +1029,6 @@ static void add_timeout(struct dlm_lkb *lkb)
        DLM_ASSERT(list_empty(&lkb->lkb_time_list), dlm_print_lkb(lkb););
        mutex_lock(&ls->ls_timeout_mutex);
        hold_lkb(lkb);
-       lkb->lkb_timestamp = jiffies;
        list_add_tail(&lkb->lkb_time_list, &ls->ls_timeout);
        mutex_unlock(&ls->ls_timeout_mutex);
 }
@@ -1057,6 +1056,7 @@ void dlm_scan_timeout(struct dlm_ls *ls)
        struct dlm_rsb *r;
        struct dlm_lkb *lkb;
        int do_cancel, do_warn;
+       s64 wait_us;
 
        for (;;) {
                if (dlm_locking_stopped(ls))
@@ -1067,14 +1067,15 @@ void dlm_scan_timeout(struct dlm_ls *ls)
                mutex_lock(&ls->ls_timeout_mutex);
                list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) {
 
+                       wait_us = ktime_to_us(ktime_sub(ktime_get(),
+                                                       lkb->lkb_timestamp));
+
                        if ((lkb->lkb_exflags & DLM_LKF_TIMEOUT) &&
-                           time_after_eq(jiffies, lkb->lkb_timestamp +
-                                         lkb->lkb_timeout_cs * HZ/100))
+                           wait_us >= (lkb->lkb_timeout_cs * 10000))
                                do_cancel = 1;
 
                        if ((lkb->lkb_flags & DLM_IFL_WATCH_TIMEWARN) &&
-                           time_after_eq(jiffies, lkb->lkb_timestamp +
-                                          dlm_config.ci_timewarn_cs * HZ/100))
+                           wait_us >= dlm_config.ci_timewarn_cs * 10000)
                                do_warn = 1;
 
                        if (!do_cancel && !do_warn)
@@ -1120,12 +1121,12 @@ void dlm_scan_timeout(struct dlm_ls *ls)
 void dlm_adjust_timeouts(struct dlm_ls *ls)
 {
        struct dlm_lkb *lkb;
-       long adj = jiffies - ls->ls_recover_begin;
+       u64 adj_us = jiffies_to_usecs(jiffies - ls->ls_recover_begin);
 
        ls->ls_recover_begin = 0;
        mutex_lock(&ls->ls_timeout_mutex);
        list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list)
-               lkb->lkb_timestamp += adj;
+               lkb->lkb_timestamp = ktime_add_us(lkb->lkb_timestamp, adj_us);
        mutex_unlock(&ls->ls_timeout_mutex);
 }
 

diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
index 18bda83..46e582c 100644 (file)
--- a/fs/dlm/netlink.c
+++ b/fs/dlm/netlink.c
@@ -115,7 +115,6 @@ static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
        data->status = lkb->lkb_status;
        data->grmode = lkb->lkb_grmode;
        data->rqmode = lkb->lkb_rqmode;
-       data->timestamp = lkb->lkb_timestamp;
        if (lkb->lkb_ua)
                data->xid = lkb->lkb_ua->xid;
        if (r) {