Messages in this thread Patch in this message | | | From | Willy Tarreau <> | Subject | [PATCH 3.10 130/139] tracing: Apply trace_clock changes to instance max buffer | Date | Wed, 1 Nov 2017 22:26:55 +0100 |
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From: Baohong Liu <baohong.liu@intel.com>
commit 170b3b1050e28d1ba0700e262f0899ffa4fccc52 upstream.
Currently trace_clock timestamps are applied to both regular and max buffers only for global trace. For instance trace, trace_clock timestamps are applied only to regular buffer. But, regular and max buffers can be swapped, for example, following a snapshot. So, for instance trace, bad timestamps can be seen following a snapshot. Let's apply trace_clock timestamps to instance max buffer as well.
Link: http://lkml.kernel.org/r/ebdb168d0be042dcdf51f81e696b17fabe3609c1.1504642143.git.tom.zanussi@linux.intel.com
Cc: stable@vger.kernel.org Fixes: 277ba0446 ("tracing: Add interface to allow multiple trace buffers") Signed-off-by: Baohong Liu <baohong.liu@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Willy Tarreau <w@1wt.eu> --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index edffb67..df820d9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4654,7 +4654,7 @@ static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, tracing_reset_online_cpus(&tr->trace_buffer); #ifdef CONFIG_TRACER_MAX_TRACE - if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer) + if (tr->max_buffer.buffer) ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); tracing_reset_online_cpus(&tr->max_buffer); #endif -- 2.8.0.rc2.1.gbe9624a
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