2 files changed, 61 insertions, 18 deletions

diff --git a/sys/dev/hwpmc/hwpmc_logging.c b/sys/dev/hwpmc/hwpmc_logging.c
index c0f8b0dac176..5f5cd90a3c8f 100644
--- a/sys/dev/hwpmc/hwpmc_logging.c
+++ b/sys/dev/hwpmc/hwpmc_logging.c
@@ -238,7 +238,7 @@ pmclog_get_buffer(struct pmc_owner *po)
 static void
 pmclog_loop(void *arg)
 {
-	int error, last_buffer;
+	int error;
 	struct pmc_owner *po;
 	struct pmclog_buffer *lb;
 	struct proc *p;
@@ -253,7 +253,6 @@ pmclog_loop(void *arg)
 	p = po->po_owner;
 	td = curthread;
 	mycred = td->td_ucred;
-	last_buffer = 0;
 
 	PROC_LOCK(p);
 	ownercred = crhold(p->p_ucred);
@@ -286,14 +285,22 @@ pmclog_loop(void *arg)
 			if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
 				mtx_unlock_spin(&po->po_mtx);
 
+				if (po->po_flags & PMC_PO_SHUTDOWN) {
+					mtx_unlock(&pmc_kthread_mtx);
+					/*
+			 		 * Close the file to get PMCLOG_EOF
+					 * error in pmclog(3).
+					 */
+					fo_close(po->po_file, curthread);
+					mtx_lock(&pmc_kthread_mtx);
+				}
+
 				(void) msleep(po, &pmc_kthread_mtx, PWAIT,
 				    "pmcloop", 0);
 				continue;
 			}
 
 			TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
-			if (po->po_flags & PMC_PO_SHUTDOWN)
-				last_buffer = TAILQ_EMPTY(&po->po_logbuffers);
 			mtx_unlock_spin(&po->po_mtx);
 		}
 
@@ -336,14 +343,6 @@ pmclog_loop(void *arg)
 			break;
 		}
 
-		if (last_buffer) {
-			/*
-			 * Close the file to get PMCLOG_EOF error
-			 * in pmclog(3).
-			 */
-			fo_close(po->po_file, curthread);
-		}
-
 		mtx_lock(&pmc_kthread_mtx);
 
 		/* put the used buffer back into the global pool */
@@ -693,6 +692,7 @@ int
 pmclog_flush(struct pmc_owner *po)
 {
 	int error;
+	struct pmclog_buffer *lb;
 
 	PMCDBG(LOG,FLS,1, "po=%p", po);
 
@@ -715,11 +715,38 @@ pmclog_flush(struct pmc_owner *po)
 	}
 
 	/*
-	 * Schedule the current buffer if any.
+	 * Schedule the current buffer if any and not empty.
+	 */
+	mtx_lock_spin(&po->po_mtx);
+	lb = po->po_curbuf;
+	if (lb && lb->plb_ptr != lb->plb_base) {
+		pmclog_schedule_io(po);
+	} else
+		error = ENOBUFS;
+	mtx_unlock_spin(&po->po_mtx);
+
+ error:
+	mtx_unlock(&pmc_kthread_mtx);
+
+	return (error);
+}
+
+int
+pmclog_close(struct pmc_owner *po)
+{
+
+	PMCDBG(LOG,CLO,1, "po=%p", po);
+
+	mtx_lock(&pmc_kthread_mtx);
+
+	/*
+	 * Schedule the current buffer.
 	 */
 	mtx_lock_spin(&po->po_mtx);
 	if (po->po_curbuf)
 		pmclog_schedule_io(po);
+	else
+		wakeup_one(po);
 	mtx_unlock_spin(&po->po_mtx);
 
 	/*
@@ -728,13 +755,11 @@ pmclog_flush(struct pmc_owner *po)
 	 */
 	po->po_flags |= PMC_PO_SHUTDOWN;
 
- error:
 	mtx_unlock(&pmc_kthread_mtx);
 
-	return (error);
+	return (0);
 }
 
-
 void
 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
 {
diff --git a/sys/dev/hwpmc/hwpmc_mod.c b/sys/dev/hwpmc/hwpmc_mod.c
index fc82908d211d..7ca7a47e12c4 100644
--- a/sys/dev/hwpmc/hwpmc_mod.c
+++ b/sys/dev/hwpmc/hwpmc_mod.c
@@ -2891,7 +2891,7 @@ pmc_syscall_handler(struct thread *td, void *syscall_args)
 			error = pmclog_configure_log(md, po, cl.pm_logfd);
 		} else if (po->po_flags & PMC_PO_OWNS_LOGFILE) {
 			pmclog_process_closelog(po);
-			error = pmclog_flush(po);
+			error = pmclog_close(po);
 			if (error == 0) {
 				LIST_FOREACH(pm, &po->po_pmcs, pm_next)
 				    if (pm->pm_flags & PMC_F_NEEDS_LOGFILE &&
@@ -2907,7 +2907,6 @@ pmc_syscall_handler(struct thread *td, void *syscall_args)
 	}
 	break;
 
-
 	/*
 	 * Flush a log file.
 	 */
@@ -2928,6 +2927,25 @@ pmc_syscall_handler(struct thread *td, void *syscall_args)
 	break;
 
 	/*
+	 * Close a log file.
+	 */
+
+	case PMC_OP_CLOSELOG:
+	{
+		struct pmc_owner *po;
+
+		sx_assert(&pmc_sx, SX_XLOCKED);
+
+		if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) {
+			error = EINVAL;
+			break;
+		}
+
+		error = pmclog_close(po);
+	}
+	break;
+
+	/*
 	 * Retrieve hardware configuration.
 	 */