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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2015-11-23 10:35:36 -0500
committerSteven Rostedt <rostedt@goodmis.org>2015-11-24 09:23:17 -0500
commitb81f472a208d3e2b4392faa6d17037a89442f4ce (patch)
tree475084e920b2cd8f45cccc45dfa7994b742113d1 /kernel
parent1ec218373b8ebda821aec00bb156a9c94fad9cd4 (diff)
downloadlinux-b81f472a208d3e2b4392faa6d17037a89442f4ce.tar.bz2
ring-buffer: Update read stamp with first real commit on page
Do not update the read stamp after swapping out the reader page from the write buffer. If the reader page is swapped out of the buffer before an event is written to it, then the read_stamp may get an out of date timestamp, as the page timestamp is updated on the first commit to that page. rb_get_reader_page() only returns a page if it has an event on it, otherwise it will return NULL. At that point, check if the page being returned has events and has not been read yet. Then at that point update the read_stamp to match the time stamp of the reader page. Cc: stable@vger.kernel.org # 2.6.30+ Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/ring_buffer.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 75f1d05ea82d..4dd6d5bc4e11 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1887,12 +1887,6 @@ rb_event_index(struct ring_buffer_event *event)
return (addr & ~PAGE_MASK) - BUF_PAGE_HDR_SIZE;
}
-static void rb_reset_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
-{
- cpu_buffer->read_stamp = cpu_buffer->reader_page->page->time_stamp;
- cpu_buffer->reader_page->read = 0;
-}
-
static void rb_inc_iter(struct ring_buffer_iter *iter)
{
struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
@@ -3626,7 +3620,7 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
/* Finally update the reader page to the new head */
cpu_buffer->reader_page = reader;
- rb_reset_reader_page(cpu_buffer);
+ cpu_buffer->reader_page->read = 0;
if (overwrite != cpu_buffer->last_overrun) {
cpu_buffer->lost_events = overwrite - cpu_buffer->last_overrun;
@@ -3636,6 +3630,10 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
goto again;
out:
+ /* Update the read_stamp on the first event */
+ if (reader && reader->read == 0)
+ cpu_buffer->read_stamp = reader->page->time_stamp;
+
arch_spin_unlock(&cpu_buffer->lock);
local_irq_restore(flags);