archive-gh-me/jerryscript
1
0
Fork 0
mirror of https://github.com/jerryscript-project/jerryscript.git synced 2025-12-15 16:29:21 +00:00
Code Issues Projects Releases Wiki Activity

Introduce GC start heuristics on low-severity try-give-memory-back requests.

Browse Source 
JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com
This commit is contained in:
Ruben Ayrapetyan 2015-08-17 17:23:49 +03:00
parent 4dcbdb44ff
commit 4667d3078b
2 changed files with 38 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
jerry-core/config.h
View File

@ -124,6 +124,15 @@
*/
// #define CONFIG_ECMA_LCACHE_DISABLE
/**
* 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.
*
* Share is calculated as the following:
* 1.0 / CONFIG_ECMA_GC_NEW_OBJECTS_SHARE_TO_START_GC
*/
#define CONFIG_ECMA_GC_NEW_OBJECTS_SHARE_TO_START_GC (16)
/**
* Link Global Environment to an empty declarative lexical environment
* instead of lexical environment bound to Global Object.

31
jerry-core/ecma/base/ecma-gc.cpp
View File

@ -72,6 +72,16 @@ static ecma_object_t *ecma_gc_objects_lists[ECMA_GC_COLOR__COUNT];
*/
static bool ecma_gc_visited_flip_flag = false;
/**
* Number of currently allocated objects
*/
static size_t ecma_gc_objects_number = 0;
/**
* Number of newly allocated objects since last GC session
*/
static size_t ecma_gc_new_objects_since_last_gc = 0;
static void ecma_gc_mark (ecma_object_t *object_p);
static void ecma_gc_sweep (ecma_object_t *object_p);
@ -180,6 +190,11 @@ ecma_gc_set_object_visited (ecma_object_t *object_p, /**< object */
void
ecma_init_gc_info (ecma_object_t *object_p) /**< object */
{
ecma_gc_objects_number++;
ecma_gc_new_objects_since_last_gc++;
JERRY_ASSERT (ecma_gc_new_objects_since_last_gc <= ecma_gc_objects_number);
ecma_gc_set_object_refs (object_p, 1);
ecma_gc_set_object_next (object_p, ecma_gc_objects_lists[ECMA_GC_COLOR_WHITE_GRAY]);
@ -406,6 +421,9 @@ ecma_gc_sweep (ecma_object_t *object_p) /**< object to free */
}
}
JERRY_ASSERT (ecma_gc_objects_number > 0);
ecma_gc_objects_number--;
ecma_dealloc_object (object_p);
} /* ecma_gc_sweep */
@ -415,6 +433,8 @@ ecma_gc_sweep (ecma_object_t *object_p) /**< object to free */
void
ecma_gc_run (void)
{
ecma_gc_new_objects_since_last_gc = 0;
JERRY_ASSERT (ecma_gc_objects_lists[ECMA_GC_COLOR_BLACK] == NULL);
/* if some object is referenced from stack or globals (i.e. it is root), mark it */
@ -517,12 +537,19 @@ ecma_try_to_give_back_some_memory (mem_try_give_memory_back_severity_t severity)
{
if (severity == MEM_TRY_GIVE_MEMORY_BACK_SEVERITY_LOW)
{
ecma_gc_run ();
/*
* If there is enough newly allocated objects since last GC, probably it is worthwhile to start GC now.
* Otherwise, probability to free sufficient space is considered to be low.
*/
if (ecma_gc_new_objects_since_last_gc * CONFIG_ECMA_GC_NEW_OBJECTS_SHARE_TO_START_GC > ecma_gc_objects_number)
{
ecma_gc_run ();
}
}
else if (severity == MEM_TRY_GIVE_MEMORY_BACK_SEVERITY_MEDIUM
|| severity == MEM_TRY_GIVE_MEMORY_BACK_SEVERITY_HIGH)
{
/* we have already done simple GC as requests come in ascending severity order */
ecma_gc_run ();
}
else
{