---
 kernel/trace/latency_hist.c |   37 +++++++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 12 deletions(-)

Index: linux-2.6.33.7.2-rt30/kernel/trace/latency_hist.c
===================================================================
--- linux-2.6.33.7.2-rt30.orig/kernel/trace/latency_hist.c
+++ linux-2.6.33.7.2-rt30/kernel/trace/latency_hist.c
@@ -94,8 +94,11 @@ static struct enable_data preemptirqsoff
     defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
 struct maxlatproc_data {
        char comm[FIELD_SIZEOF(struct task_struct, comm)];
+       char current_comm[FIELD_SIZEOF(struct task_struct, comm)];
        int pid;
+       int current_pid;
        int prio;
+       int current_prio;
        long latency;
        long timeroffset;
 };
@@ -227,8 +230,12 @@ void notrace latency_hist(int latency_ty
                    latency_type == MISSED_TIMER_OFFSETS ||
                    latency_type == TIMERANDWAKEUP_LATENCY) {
                        strncpy(mp->comm, p->comm, sizeof(mp->comm));
+                       strncpy(mp->current_comm, current->comm,
+                           sizeof(mp->current_comm));
                        mp->pid = task_pid_nr(p);
+                       mp->current_pid = task_pid_nr(current);
                        mp->prio = p->prio;
+                       mp->current_prio = current->prio;
                        mp->latency = latency;
                        mp->timeroffset = timeroffset;
                }
@@ -346,6 +353,13 @@ static struct file_operations latency_hi
        .release = seq_release,
 };
 
+static void clear_maxlatprocdata(struct maxlatproc_data *mp)
+{
+       mp->comm[0] = mp->current_comm[0] = '\0';
+       mp->prio = mp->current_prio = mp->current_pid =
+           mp->latency = mp->timeroffset = -1;
+}
+
 static void hist_reset(struct hist_data *hist)
 {
        atomic_dec(&hist->hist_mode);
@@ -422,10 +436,8 @@ latency_hist_reset(struct file *file, co
                if (latency_type == WAKEUP_LATENCY ||
                    latency_type == WAKEUP_LATENCY_SHAREDPRIO ||
                    latency_type == MISSED_TIMER_OFFSETS ||
-                   latency_type == TIMERANDWAKEUP_LATENCY) {
-                       mp->comm[0] = '\0';
-                       mp->prio = mp->pid = mp->latency = mp->timeroffset = -1;
-               }
+                   latency_type == TIMERANDWAKEUP_LATENCY)
+                       clear_maxlatprocdata(mp);
 #endif
        }
 
@@ -476,15 +488,16 @@ show_maxlatproc(struct file *file, char 
 {
        int r;
        struct maxlatproc_data *mp = file->private_data;
-       int strmaxlen = TASK_COMM_LEN + 32;
+       int strmaxlen = (TASK_COMM_LEN * 2) + (6 * 8);
        char *buf = kmalloc(strmaxlen, GFP_KERNEL);
 
        if (buf == NULL)
                return -ENOMEM;
 
-       r = snprintf(buf, strmaxlen, "%d %d %ld (%ld) %s\n",
-           mp->pid, MAX_RT_PRIO-1 - mp->prio, mp->latency, mp->timeroffset,
-           mp->comm);
+       r = snprintf(buf, strmaxlen,
+           "%d %d %ld (%ld) %s <- %d %d %s\n", mp->pid,
+           MAX_RT_PRIO-1 - mp->prio, mp->latency, mp->timeroffset, mp->comm,
+           mp->current_pid, MAX_RT_PRIO-1 - mp->current_prio, mp->current_comm);
        r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
        kfree(buf);
        return r;
@@ -1054,12 +1067,12 @@ static __init int latency_hist_init(void
                mp = &per_cpu(wakeup_maxlatproc, i);
                entry = debugfs_create_file(name, 0444, dentry, mp,
                    &maxlatproc_fops);
-               mp->prio = mp->pid = mp->latency = mp->timeroffset = -1;
+               clear_maxlatprocdata(mp);
 
                mp = &per_cpu(wakeup_maxlatproc_sharedprio, i);
                entry = debugfs_create_file(name, 0444, dentry_sharedprio, mp,
                    &maxlatproc_fops);
-               mp->prio = mp->pid = mp->latency = mp->timeroffset = -1;
+               clear_maxlatprocdata(mp);
        }
        entry = debugfs_create_file("pid", 0644, dentry,
            (void *)&wakeup_pid, &pid_fops);
@@ -1087,7 +1100,7 @@ static __init int latency_hist_init(void
                mp = &per_cpu(missed_timer_offsets_maxlatproc, i);
                entry = debugfs_create_file(name, 0444, dentry, mp,
                    &maxlatproc_fops);
-               mp->prio = mp->pid = mp->latency = mp->timeroffset = -1;
+               clear_maxlatprocdata(mp);
        }
        entry = debugfs_create_file("pid", 0644, dentry,
            (void *)&missed_timer_offsets_pid, &pid_fops);
@@ -1115,7 +1128,7 @@ static __init int latency_hist_init(void
                mp = &per_cpu(timerandwakeup_maxlatproc, i);
                entry = debugfs_create_file(name, 0444, dentry, mp,
                    &maxlatproc_fops);
-               mp->prio = mp->pid = mp->latency = mp->timeroffset = -1;
+               clear_maxlatprocdata(mp);
        }
        entry = debugfs_create_file("reset", 0644, dentry,
            (void *)TIMERANDWAKEUP_LATENCY, &latency_hist_reset_fops);