I would also like to follow along with the idea, as this may help QA
with finding more critical bugs and help Dev reduce time in
troubleshooting where the issue lies.
What is the bug number?
Regards,
Naoki
On 8/23/13 9:02 AM, Ben Kelly wrote:
On 08/23/2013 11:29 AM, Thinker K.F. Li wrote:
We are working on a tool to help people to correlate runnables spread
over threads and processes (b2g & content process). The basic idea is
to give every runnable an unique ID, all runnables created by a runnable
share the same unique ID. Only the runnables created by events from
kernel/platform; e.g. input event, timer, network, sensors, ..., would
be assigned a new unique ID. So we can correlate all runnables
according unique IDs to understand the tracks of events.
The runnables created by events are origins. For example an input event
post a runnable on the main thread, that runnable is the origin of the
event. The origin gets a new unique ID. The origin may create a series
of more runanbles, they all share the same ID. By recording timestamp
for equeuing, dequeuing, and completion of runnables, and the unqiue
IDs, we can study how b2g spend the time and latency between threads for
events.
The unique IDs would be passed over IPC, so we can trace runnables
passed among processes. Some more information can be attached with the
unique IDs. But we would like to start by simple, so I don't mention
details here.
This sounds like a great tool!
I'm curious if you have any idea about how much overhead this will add?
It sounds like it won't be bad. Are you planning to make it always on
or require a compile flag?
Also, how do you see us getting the data out? I assume the next problem
to solve will be visualizing the data usefully.
Finally, do you have a bug number for tracking this work? I'd like to
follow along on CC.
Thanks!
Ben
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