As sizes and memptrs map are to store the temporal information of each thread, use only tid portion of the return value of bpf_get_current_pid_tgid as a key of sizes and memptrs map. This change could reduce the key size of each map from 64 bits to 32 bits. The lower 32 bits portion of the return value of bpf_get_current_pid_tgid is kernel's view of the pid, which in user space is usually presented as the tid.
yonghong-song
commented
8 months ago
As
sizesandmemptrsmap are to store the temporal information of each thread, use onlytidportion of the return value ofbpf_get_current_pid_tgidas a key ofsizesandmemptrsmap. This change could reduce the key size of each map from 64 bits to 32 bits. The lower 32 bits portion of the return value ofbpf_get_current_pid_tgidis kernel's view of thepid, which in user space is usually presented as thetid.Please refer this document for further information: https://github.com/iovisor/bcc/blob/master/docs/reference_guide.md#4-bpf_get_current_pid_tgid