cilium
tetragon/pkg: add user-configurable BPF_F_NO_PREALLOC flag support
Description
This commit adds support for controlling the BPF_F_NO_PREALLOC flag on BPF maps through CLI flags. Users can now disable preallocation globally or for specific maps to reduce memory usage.
Fixes: #4249
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Thanks for taking time to review this PR @mtardy!
Let's wait @kkourt for his comment about this idea.
If you all agree to have a generic flag to enable/disable BPF_F_NO_PREALLOC, I can modify the title of the issue as well as this PR and commit messages.
@mtardy @kkourt I have modified the implementation regarding to the discussion in #4249 It's ready for re-review. Thanks!
I need to check the issue properly, but did we discuss performance implications? I guess policy_filter_maps is fine, I'm not sure override_task is that straight forward
It has been discussed a bit in the issue. Additionally, #4204 proposed an idea to use shared override_task map, which will optimize both memory utilization and CPU consumption.