diff options
Diffstat (limited to 'tools/xentrace/xentrace.c')
| -rw-r--r-- | tools/xentrace/xentrace.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/xentrace/xentrace.c b/tools/xentrace/xentrace.c index 18283f3e97..cce5469c47 100644 --- a/tools/xentrace/xentrace.c +++ b/tools/xentrace/xentrace.c @@ -149,6 +149,7 @@ void membuf_reserve_window(unsigned cpu, unsigned long window_size) { struct cpu_change_record *rec; long need_to_consume, free, freed; + int last_cpu = -1; if ( membuf.pending_size > 0 ) { @@ -193,11 +194,25 @@ void membuf_reserve_window(unsigned cpu, unsigned long window_size) if ( need_to_consume > 0 ) { + last_cpu = rec->data.cpu; MEMBUF_CONS_INCREMENT(freed); need_to_consume -= freed; } } while( need_to_consume > 0 ); + /* For good tsc consistency, we need to start at a low-cpu buffer. Keep + * skipping until the cpu goes down or stays the same. */ + rec = (struct cpu_change_record *)MEMBUF_POINTER(membuf.cons); + while ( rec->data.cpu > last_cpu ) + { + last_cpu = rec->data.cpu; + + freed = sizeof(*rec) + rec->data.window_size; + + MEMBUF_CONS_INCREMENT(freed); + rec = (struct cpu_change_record *)MEMBUF_POINTER(membuf.cons); + } + start_window: /* * Start writing "pending" data. Update prod once all this data is |