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e2a6653680
This is both a feature and an optimization. Feature: Adjustable size of the internal storage in esp_event queue, currently used by ISR posting, as they wont be able to make a malloc. Optimization: When non-isr is posting an event, use the inernal storage in the struct instead of always allocating a new heap for the data. Most events in esp-idf only contains a few bytes event information, and we have that allocation payed for anyway. This solved in a big part our memory fragmentation issue, as events happens freqvently and used to create small memory allocations for just 4 bytes, and then in the event handler we usually allocated a bigger chunk of heap for our feature. When returning from the event handler, the 4 byte allocation was freed, leaving a hole in the heap. Merges: https://github.com/espressif/esp-idf/pull/17797
48 lines
2.0 KiB
Plaintext
48 lines
2.0 KiB
Plaintext
menu "Event Loop Library"
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config ESP_EVENT_LOOP_PROFILING
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bool "Enable event loop profiling"
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default n
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help
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Enables collections of statistics in the event loop library such as the number of events posted
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to/received by an event loop, number of callbacks involved, number of events dropped to to a full event
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loop queue, run time of event handlers, and number of times/run time of each event handler.
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config ESP_EVENT_POST_FROM_ISR
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bool "Support posting events from ISRs"
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default y
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help
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Enable posting events from interrupt handlers.
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config ESP_EVENT_POST_FROM_ISR_SIZE
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int "Max size of data from events (bytes)"
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default 4
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depends on ESP_EVENT_POST_FROM_ISR
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range 4 256
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help
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Maximum size (in bytes) of event data that will be kept in the inline event
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storage.
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When ESP_EVENT_POST_FROM_ISR is enabled, event data with size less
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than or equal to this value is copied into the fixed-size inline storage.
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If event's data is larger than this limit, a heap allocation is performed
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and the data is copied into the allocated buffer before posting.
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When ESP_EVENT_POST_FROM_ISR is disabled, event data is always
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copied to a heap-allocated buffer to ensure the data remains valid until the
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event is processed.
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Choose this value to trade static RAM footprint of the inline storage
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against the frequency of heap allocations: smaller values reduce static
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memory usage; larger values reduce heap allocations and fragmentation.
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config ESP_EVENT_POST_FROM_IRAM_ISR
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bool "Support posting events from ISRs placed in IRAM"
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default y
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depends on ESP_EVENT_POST_FROM_ISR
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help
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Enable posting events from interrupt handlers placed in IRAM. Enabling this option places API functions
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esp_event_post and esp_event_post_to in IRAM.
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endmenu
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