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Reduce logger CPU usage by disabling loop when buffer is empty (#9160)

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Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
J. Nick Koston
2025-06-26 03:44:07 +02:00
committed by GitHub
parent 17497eec43
commit e017250445
3 changed files with 35 additions and 0 deletions
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20
esphome/components/logger/logger.h
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@@ -358,6 +358,26 @@ class Logger : public Component {
static const uint16_t RESET_COLOR_LEN = strlen(ESPHOME_LOG_RESET_COLOR);
this->write_body_to_buffer_(ESPHOME_LOG_RESET_COLOR, RESET_COLOR_LEN, buffer, buffer_at, buffer_size);
}
#ifdef USE_ESP32
// Disable loop when task buffer is empty (with USB CDC check)
inline void disable_loop_when_buffer_empty_() {
// Thread safety note: This is safe even if another task calls enable_loop_soon_any_context()
// concurrently. If that happens between our check and disable_loop(), the enable request
// will be processed on the next main loop iteration since:
// - disable_loop() takes effect immediately
// - enable_loop_soon_any_context() sets a pending flag that's checked at loop start
#if defined(USE_LOGGER_USB_CDC) && defined(USE_ARDUINO)
// Only disable if not using USB CDC (which needs loop for connection detection)
if (this->uart_ != UART_SELECTION_USB_CDC) {
this->disable_loop();
}
#else
// No USB CDC support, always safe to disable
this->disable_loop();
#endif
}
#endif
};
extern Logger *global_logger; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)