Hubble: Performance Debugging with In-Production, Just-In-Time Method Tracing on Android


Yu Luo and Kirk Rodrigues, University of Toronto; Cuiqin Li, Feng Zhang, Lijin Jiang, and Bing Xia, Huawei Technologies Co., Ltd.; David Lion and Ding Yuan, University of Toronto


Hubble is a method-tracing system shipped on all supported and upcoming Android devices manufactured by Huawei, in order to aid in debugging performance problems. Hubble instruments every non-inlined bytecode method's entry and exit to record the method's name and a timestamp. Instead of persisting all data, trace points are recorded into an in-memory ring buffer where older data is constantly overwritten. This data is only persisted when a performance problem is detected, giving engineers access to invaluable, detailed runtime data Just-In-Time before the detected anomaly. Hubble is highly efficient, with its tracing inducing negligible overhead in real-world usage and each trace point taking less than one nanosecond in our microbenchmark. Hubble significantly eases the debugging of user-experienced performance problems and has enabled engineers to quickly resolve many bug tickets that were open for months before Hubble was available.

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@inproceedings {280872,
author = {Yu Luo and Kirk Rodrigues and Cuiqin Li and Feng Zhang and Lijin Jiang and Bing Xia and David Lion and Ding Yuan},
title = {Hubble: Performance Debugging with {In-Production}, {Just-In-Time} Method Tracing on Android},
booktitle = {16th USENIX Symposium on Operating Systems Design and Implementation (OSDI 22)},
year = {2022},
isbn = {978-1-939133-28-1},
address = {Carlsbad, CA},
pages = {787--803},
url = {},
publisher = {USENIX Association},
month = jul

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