tree 7c628a8ef5d27882de32cf72bf0af66748c6ebab
parent 2df19cd16ff69429faa8b7b86d6630ba35907734
author Zhiyong Ye <yezhiyong@bytedance.com> 1652628291 +0800
committer Zhiyong Ye <yezhiyong@bytedance.com> 1652628291 +0800

tools/runqlen: Set the size of BPF map object according to the number of CPUs

When runqlen.py uses the -C parameter to show histograms for each CPU
separately, it can only output information for the first 64 CPUs when
the number of CPUs is large (e.g. AMD Milan has 256 CPUs).

This is because BPF_HISTOGRAM does not set the size of the BPF map
object in the code, and the default size is 64, so it can be fixed by
setting it to the current number of CPUs.

Signed-off-by: Zhiyong Ye <yezhiyong@bytedance.com>