  We present PTracer, a Linux kernel patch trace bot based on an improved
PatchNet. PTracer continuously monitors new patches in the git repository of
the mainline Linux kernel, filters out unconcerned ones, classifies the rest as
bug-fixing or non bug-fixing patches, and reports bug-fixing patches to the
kernel experts of commercial operating systems. We use the patches in February
2019 of the mainline Linux kernel to perform the test. As a result, PTracer
recommended 151 patches to CGEL kernel experts out of 5,142, and 102 of which
were accepted. PTracer has been successfully applied to a commercial operating
system and has the advantages of improving software quality and saving labor
cost.
