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Refactor memory management (#2954)

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This PR is a general cleanup for garbage collection and memory
allocation code paths.

Changes:
  * Removed an unnecesary local variable from 'ecma_gc_mark'.
  * Refactored 'ecma_gc_run' to have an implicit list head during
    iteration, which results in one less condition in the loops,
    and changed the loops to use compressed pointers to reduce the
    overall amount of compression/decompression.
  * Renamed 'jmem_free_unused_memory_severity_t' to 'jmem_pressure_t',
    and added additional values.
  * Removed 'jmem_free_unused_memory_callback', instead
    'ecma_free_unused_memory' is now called directly.
  * Reworked 'ecma_free_unused_memory' to handle all code paths related
    to 'jmem_pressure_t', and moved all relevant code paths into this
    function. This simplifies the code paths in other places.
  * Reworked 'jmem_heap_gc_and_alloc_block' to be more streamlined.
  * Changed mem-stats to not report unused pool chunks as allocated
    memory.
  * Created an allocator internal API for allocating/freeing memory blocks
    that are not reported as used memory in mem-stats.
  * Removed iteration statistics for the jerry allocator from mem-stats,
    as they don't provide any actually useful information.

Co-authored-by: Marko Fabo <mfabo@inf.u-szeged.hu>
JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu
This commit is contained in:
Dániel Bátyai
2019-07-17 14:12:23 +02:00
committed by GitHub
parent a44d584842
commit ff22634e27
27 changed files with 297 additions and 538 deletions
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jerry-core/jcontext/jcontext.h
+5 -6
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@@ -53,13 +53,13 @@
#define CONFIG_MEM_HEAP_DESIRED_LIMIT (JERRY_MIN (CONFIG_MEM_HEAP_SIZE / 32, CONFIG_MEM_HEAP_MAX_LIMIT))
/**
* Share of newly allocated since last GC objects among all currently allocated objects,
* after achieving which, GC is started upon low severity try-give-memory-back requests.
* Amount of newly allocated objects since the last GC run, represented as a fraction of all allocated objects,
* which when reached will trigger garbage collection to run with a low pressure setting.
*
* Share is calculated as the following:
* 1.0 / CONFIG_ECMA_GC_NEW_OBJECTS_SHARE_TO_START_GC
* The fraction is calculated as:
* 1.0 / CONFIG_ECMA_GC_NEW_OBJECTS_FRACTION
*/
#define CONFIG_ECMA_GC_NEW_OBJECTS_SHARE_TO_START_GC (16)
#define CONFIG_ECMA_GC_NEW_OBJECTS_FRACTION (16)
#if !ENABLED (JERRY_SYSTEM_ALLOCATOR)
/**
@@ -121,7 +121,6 @@ struct jerry_context_t
#if ENABLED (JERRY_CPOINTER_32_BIT)
jmem_pools_chunk_t *jmem_free_16_byte_chunk_p; /**< list of free sixteen byte pool chunks */
#endif /* ENABLED (JERRY_CPOINTER_32_BIT) */
jmem_free_unused_memory_callback_t jmem_free_unused_memory_callback; /**< Callback for freeing up memory. */
const lit_utf8_byte_t * const *lit_magic_string_ex_array; /**< array of external magic strings */
const lit_utf8_size_t *lit_magic_string_ex_sizes; /**< external magic string lengths */
ecma_lit_storage_item_t *string_list_first_p; /**< first item of the literal string list */