aya-log: Add *max_level_* filter features
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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>
alessandrod
reviewed
Nov 9, 2022
| } else if let Some(level) = args.level { | ||
| // Level was chosen by passing an argument to the log! macro. | ||
| // We need to apply the max log level filter here. | ||
| let level_str = format!("{:?}", level); |
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Instead of doing this, the Level enum should be parseable from a TokenStream (using syn::parse::Parse), so we don't have to do this string hack
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@vadorovsky, this pull request is now in conflict and requires a rebase. |
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@vadorovsky, this pull request is now in conflict and requires a rebase. |
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Add the following features for configuring the maximum log level available:
max_level_offmax_level_errormax_level_warnmax_level_infomax_level_debugmax_level_tracerelease_max_level_offrelease_max_level_errorrelease_max_level_warnrelease_max_level_inforelease_max_level_debugrelease_max_level_traceLog 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