doc: add trace_buf_size description to kernel-parameters.txt

from early boot tracing view, trace_buf_size parameter is important.
it should be documented.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
LKML-Reference: <20090310135200.A48B.A69D9226@jp.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 454f42b..7643483 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2344,6 +2344,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
        tp720=          [HW,PS2]
 
+       trace_buf_size=nn[KMG] [ftrace] will set tracing buffer size.
+
        trix=           [HW,OSS] MediaTrix AudioTrix Pro
                        Format:
                        <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>