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| author | Sanrio Alvares <salvares@codeaurora.org> | 2016-01-15 17:04:21 -0800 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 21:21:34 -0700 |
| commit | e663ad89f8c5f0a8a15008c650a94f3783c5650e (patch) | |
| tree | f0d6fa5b530f832c41133dcd7c6c15999fff2a1f /include/linux/root_dev.h | |
| parent | e25408846804c522b4157a098f3d93739a8db672 (diff) | |
trace, scm: trace scm calls
Create a scm group to enable profiling time spent in a scm call.
This will help determine which scm call is spending how much time in
a higher execution level.
To enable "echo 1 > /sys/kernel/debug/tracing/events/scm/enable".
It is disabled by default. If enabled, traces can be found in
Ftrace logs.
Ftrace Output Example:
PROCESS CPU TIME SCM ID, X0, Number of args, args[0-2], X5, return values [0-2]
kworker/u8:4-329 [002] 128.201129: scm_call_start: func id=0x42000904 (args: 0x6, 0x2, 0x200000000, 0x65b8000000019, 0x142e0f000)
kworker/u8:4-329 [002] 128.201383: scm_call_end: ret: 0, 0, 0x4a07e00000001
kworker/u8:4-329 [002] 128.201464: scm_call_start: func id=0x42000904 (args: 0x6, 0x3, 0x1312d0000000000, 0x17900000000, 0x142e0f000)
kworker/u8:4-329 [002] 128.201542: scm_call_end: ret: 0x1bf03dddddd, 0x2f72656b726f776b, 0x343a32
CRs-Fixed: 969770
Change-Id: I4e5aaff796dbc9457c55fa529114dcb57780b7ec
Signed-off-by: Sanrio Alvares <salvares@codeaurora.org>
Diffstat (limited to 'include/linux/root_dev.h')
0 files changed, 0 insertions, 0 deletions