Commits on Sep 30, 2022

1. aya-log: Add *max_level_* filter features …

   Add the following features for configuring the maximum log level
   available:
   
   * `max_level_off`
   * `max_level_error`
   * `max_level_warn`
   * `max_level_info`
   * `max_level_debug`
   * `max_level_trace`
   * `release_max_level_off`
   * `release_max_level_error`
   * `release_max_level_warn`
   * `release_max_level_info`
   * `release_max_level_debug`
   * `release_max_level_trace`
   
   Log invocations at disabled level will be skipped, which is especially
   beneficial for eBPF programs which are not going to send unneceessary
   logs through perf buffers.
   
   Features with `release_` prefix are used only in release builds.
   
   Those features have to applied on the userspace and eBPF crate
   separately. The correct thing to do is to set them on the same level. In
   case when userspace has higher maximum log level, it's not going to
   recieve the logs beyond the filter in eBPF crate. In the opposite
   situation, when eBPF crate has higher maximum level, it's going to waste
   cycles on sending logs through perf buffer, while they are not going to
   be displayed in the userspace.
   
   Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>

   

   vadorovsky committed Sep 30, 2022
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