X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=libust%2Fserialize.c;h=4c23e8dd02451d46d6b8de34c418d40e872bc9f3;hb=d169a27dd79a872d5c44f0547a2bb33bb8402b80;hp=a9c6f69b79dd4e97b1d3e66169bd780a9aef44f7;hpb=8c36d1ee4e2c77783f6edfdd49f2d812afdd3f67;p=ust.git

diff --git a/libust/serialize.c b/libust/serialize.c
index a9c6f69..4c23e8d 100644
--- a/libust/serialize.c
+++ b/libust/serialize.c
@@ -41,6 +41,7 @@
 #include "tracer.h"
 //#include "list.h"
 #include "usterr.h"
+#include "ust_snprintf.h"
 
 enum ltt_type {
 	LTT_TYPE_SIGNED_INT,
@@ -622,11 +623,11 @@ notrace void ltt_vtrace(const struct marker *mdata, void *probe_data,
 		return;
 
 	rcu_read_lock(); //ust// rcu_read_lock_sched_notrace();
-//ust//	cpu = smp_processor_id();
 	cpu = ust_get_cpu();
-//ust//	__get_cpu_var(ltt_nesting)++;
-	/* FIXME: should nesting be per-cpu? */
-	ltt_nesting++;
+
+	/* Force volatile access. */
+	STORE_SHARED(ltt_nesting, LOAD_SHARED(ltt_nesting) + 1);
+	barrier();
 
 	pdata = (struct ltt_active_marker *)probe_data;
 	eID = mdata->event_id;
@@ -647,6 +648,7 @@ notrace void ltt_vtrace(const struct marker *mdata, void *probe_data,
 	largest_align = 1;	/* must be non-zero for ltt_align */
 	data_size = ltt_get_data_size(&closure, serialize_private,
 					&largest_align, fmt, &args_copy);
+	largest_align = min_t(int, largest_align, sizeof(void *));
 	va_end(args_copy);
 
 	/* Iterate on each trace */
@@ -708,10 +710,12 @@ notrace void ltt_vtrace(const struct marker *mdata, void *probe_data,
 		va_end(args_copy);
 		/* Out-of-order commit */
 		ltt_commit_slot(channel, buf, buf_offset, data_size, slot_size);
-		DBG("just commited event at offset %ld and size %zd", buf_offset, slot_size);
+		DBG("just commited event (%s/%s) at offset %ld and size %zd", mdata->channel, mdata->name, buf_offset, slot_size);
 	}
-//ust//	__get_cpu_var(ltt_nesting)--;
-	ltt_nesting--;
+
+	barrier();
+	STORE_SHARED(ltt_nesting, LOAD_SHARED(ltt_nesting) - 1);
+
 	rcu_read_unlock(); //ust// rcu_read_unlock_sched_notrace();
 }
 
@@ -807,7 +811,7 @@ int serialize_to_text(char *outbuf, int bufsize, const char *fmt, va_list ap)
 		outbuf = &false_buf;
 		bufsize = 1;
 	}
-	result = vsnprintf(outbuf, bufsize, new_fmt, ap);
+	result = ust_safe_vsnprintf(outbuf, bufsize, new_fmt, ap);
 
 	return result;
 }