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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/jmem/jmem-allocator.c
-37
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@@ -232,40 +232,3 @@ jmem_decompress_pointer (uintptr_t compressed_pointer) /**< pointer to decompres
return (void *) uint_ptr;
} /* jmem_decompress_pointer */
/**
* Register specified 'try to give memory back' callback routine
*/
void
jmem_register_free_unused_memory_callback (jmem_free_unused_memory_callback_t callback) /**< callback routine */
{
/* Currently only one callback is supported */
JERRY_ASSERT (JERRY_CONTEXT (jmem_free_unused_memory_callback) == NULL);
JERRY_CONTEXT (jmem_free_unused_memory_callback) = callback;
} /* jmem_register_free_unused_memory_callback */
/**
* Unregister specified 'try to give memory back' callback routine
*/
void
jmem_unregister_free_unused_memory_callback (jmem_free_unused_memory_callback_t callback) /**< callback routine */
{
/* Currently only one callback is supported */
JERRY_ASSERT (JERRY_CONTEXT (jmem_free_unused_memory_callback) == callback);
JERRY_CONTEXT (jmem_free_unused_memory_callback) = NULL;
} /* jmem_unregister_free_unused_memory_callback */
/**
* Run 'try to give memory back' callbacks with specified severity
*/
void
jmem_run_free_unused_memory_callbacks (jmem_free_unused_memory_severity_t severity) /**< severity of the request */
{
if (JERRY_CONTEXT (jmem_free_unused_memory_callback) != NULL)
{
JERRY_CONTEXT (jmem_free_unused_memory_callback) (severity);
}
jmem_pools_collect_empty ();
} /* jmem_run_free_unused_memory_callbacks */