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Finish heap merging, use separate heap locks

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This commit is contained in:
Justin Ethier 2017-01-28 00:01:01 -05:00
parent e30ff16b3d
commit 8fa1bccd78
3 changed files with 65 additions and 42 deletions
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19
examples/threading/benchmarks/ctak.scm
View file

@ -35,15 +35,15 @@
(string-append name ":" s1 ":" s2 ":" s3 ":" s4)
count
(lambda ()
(thread-start!
(make-thread
(lambda ()
(ctak (hide count input1) (hide count input2) (hide count input3)))))
(thread-start!
(make-thread
(lambda ()
(ctak (hide count input1) (hide count input2) (hide count input3)))))
(thread-start!
#;(thread-start!
(make-thread
(lambda ()
(ctak (hide count input1) (hide count input2) (hide count input3)))))
#;(thread-start!
(make-thread
(lambda ()
(ctak (hide count input1) (hide count input2) (hide count input3)))))
#;(thread-start!
(make-thread
(lambda ()
(ctak (hide count input1) (hide count input2) (hide count input3)))))
@ -51,6 +51,7 @@
(make-thread
(lambda ()
(ctak (hide count input1) (hide count input2) (hide count input3)))))
(thread-sleep! 10000)
(ctak (hide count input1) (hide count input2) (hide count input3))
;; TODO: thread-join

85
gc.c
View file

@ -55,14 +55,11 @@ static void **mark_stack = NULL;
static int mark_stack_len = 0;
static int mark_stack_i = 0;
// OBSOLETE:
//// Lock to protect the heap from concurrent modifications
//static pthread_mutex_t heap_lock;
//
//// Cached heap statistics
//static uint64_t cached_heap_free_sizes[7] = { 0, 0, 0, 0, 0, 0, 0 };
//static uint64_t cached_heap_total_sizes[7] = { 0, 0, 0, 0, 0, 0, 0 };
//// END OBSOLETE
// Data for the "main" thread which is guaranteed to always be there.
// Per SRFI 18:
// All threads are terminated when the primordial
// thread terminates (normally or not).
static gc_thread_data *primordial_thread = NULL;
// Data for each individual mutator thread
ck_array_t Cyc_mutators, old_mutators;
@ -162,6 +159,11 @@ void gc_add_mutator(gc_thread_data * thd)
}
ck_array_commit(&Cyc_mutators);
pthread_mutex_unlock(&mutators_lock);
// Main thread is always the first one added
if (primordial_thread == NULL) {
primordial_thread = thd;
}
}
// Remove selected mutator from the mutator list.
@ -479,7 +481,7 @@ int gc_grow_heap(gc_heap * h, int heap_type, size_t size, size_t chunk_size, gc_
{
size_t /*cur_size,*/ new_size;
gc_heap *h_last = h, *h_new;
pthread_mutex_lock(&(thd->lock)); //heap_lock);
pthread_mutex_lock(&(thd->heap_lock));
// Compute size of new heap page
if (heap_type == HEAP_HUGE) {
new_size = gc_heap_align(size) + 128;
@ -522,7 +524,7 @@ int gc_grow_heap(gc_heap * h, int heap_type, size_t size, size_t chunk_size, gc_
// Done with computing new page size
h_new = gc_heap_create(heap_type, new_size, h_last->max_size, chunk_size, thd);
h_last->next = h_new;
pthread_mutex_unlock(&(thd->lock)); //heap_lock);
pthread_mutex_unlock(&(thd->heap_lock));
#if GC_DEBUG_TRACE
fprintf(stderr, "DEBUG - grew heap\n");
#endif
@ -534,7 +536,7 @@ void *gc_try_alloc(gc_heap * h, int heap_type, size_t size, char *obj,
{
gc_heap *h_passed = h;
gc_free_list *f1, *f2, *f3;
pthread_mutex_lock(&(thd->lock)); //heap_lock);
pthread_mutex_lock(&(thd->heap_lock));
// Start searching from the last heap page we had a successful
// allocation from, unless the current request is for a smaller
// block in which case there may be available memory closer to
@ -566,12 +568,12 @@ void *gc_try_alloc(gc_heap * h, int heap_type, size_t size, char *obj,
}
h_passed->next_free = h;
h_passed->last_alloc_size = size;
pthread_mutex_unlock(&(thd->lock)); //heap_lock);
pthread_mutex_unlock(&(thd->heap_lock));
return f2;
}
}
}
pthread_mutex_unlock(&(thd->lock)); //heap_lock);
pthread_mutex_unlock(&(thd->heap_lock));
return NULL;
}
@ -617,9 +619,9 @@ void *gc_alloc(gc_heap_root * hrt, size_t size, char *obj, gc_thread_data * thd,
if (!result) {
fprintf(stderr, "out of memory error allocating %zu bytes\n", size);
fprintf(stderr, "Heap type %d diagnostics:\n", heap_type);
pthread_mutex_lock(&(thd->lock)); //heap_lock);
pthread_mutex_lock(&(thd->heap_lock));
gc_print_stats(h);
pthread_mutex_unlock(&(thd->lock)); //heap_lock); // why not
pthread_mutex_unlock(&(thd->heap_lock)); // why not
exit(1); // could throw error, but OOM is a major issue, so...
}
}
@ -798,13 +800,9 @@ size_t gc_sweep(gc_heap * h, int heap_type, size_t * sum_freed_ptr, gc_thread_da
//
// Lock the heap to prevent issues with allocations during sweep
// It sucks to have to use a coarse-grained lock like this, but let's
// be safe and prevent threading issues right now. Once the new GC
// works we can go back and try to speed things up (if possible)
// by using more fine-grained locking. Can also profile to see
// how much time is even spent sweeping
// This coarse-grained lock actually performed better than a fine-grained one.
//
pthread_mutex_lock(&(thd->lock)); //heap_lock);
pthread_mutex_lock(&(thd->heap_lock));
h->next_free = h;
h->last_alloc_size = 0;
@ -945,7 +943,7 @@ size_t gc_sweep(gc_heap * h, int heap_type, size_t * sum_freed_ptr, gc_thread_da
gc_print_stats(orig_heap_ptr);
#endif
pthread_mutex_unlock(&(thd->lock)); //heap_lock);
pthread_mutex_unlock(&(thd->heap_lock));
if (sum_freed_ptr)
*sum_freed_ptr = sum_freed;
return max_freed;
@ -1663,6 +1661,10 @@ void gc_thread_data_init(gc_thread_data * thd, int mut_num, char *stack_base,
thd->mark_buffer_len = 128;
thd->mark_buffer =
vpbuffer_realloc(thd->mark_buffer, &(thd->mark_buffer_len));
if (pthread_mutex_init(&(thd->heap_lock), NULL) != 0) {
fprintf(stderr, "Unable to initialize thread mutex\n");
exit(1);
}
if (pthread_mutex_init(&(thd->lock), NULL) != 0) {
fprintf(stderr, "Unable to initialize thread mutex\n");
exit(1);
@ -1683,13 +1685,6 @@ void gc_thread_data_init(gc_thread_data * thd, int mut_num, char *stack_base,
void gc_thread_data_free(gc_thread_data * thd)
{
if (thd) {
//
// !!
// TODO: (not necessarily here, but somewhere need to roll heap pages into
// another thread data. need to include cached heap sizes/total, too.
// then free cached heap vars here.
// !!
//
if (pthread_mutex_destroy(&thd->lock) != 0) {
// TODO: can only destroy the lock if it is unlocked. need to make sure we
// can guarantee that is the case prior to making this call
@ -1697,6 +1692,23 @@ void gc_thread_data_free(gc_thread_data * thd)
fprintf(stderr, "Thread mutex is locked, unable to free\n");
exit(1);
}
if (pthread_mutex_destroy(&thd->heap_lock) != 0) {
fprintf(stderr, "Thread heap mutex is locked, unable to free\n");
exit(1);
}
// Merge heaps for the terminating thread into the main thread's heap.
// Eventually any data that is unused will be freed, but we need to
// keep the heap pages for now because they could still contain live
// objects.
// Lock the primordial thread (hopefully will not cause any deadlocks)
// but don't bother locking thd since it is already done by now.
pthread_mutex_lock(&(primordial_thread->heap_lock));
gc_merge_all_heaps(primordial_thread, thd);
pthread_mutex_unlock(&(primordial_thread->heap_lock));
if (thd->cached_heap_free_sizes)
free(thd->cached_heap_free_sizes);
if (thd->cached_heap_total_sizes);
free(thd->cached_heap_total_sizes);
if (thd->jmp_start)
free(thd->jmp_start);
if (thd->gc_args)
@ -1723,18 +1735,27 @@ void gc_heap_merge(gc_heap *hdest, gc_heap *hsrc)
last->next = hsrc;
}
void gc_heap_merge_all(gc_heap_root *dest, gc_heap_root *src)
/**
* Merge all thread heaps into another.
* Assumes appropriate locks are already held.
*/
void gc_merge_all_heaps(gc_thread_data *dest, gc_thread_data *src)
{
gc_heap *hdest, *hsrc;
int heap_type;
for (heap_type = 0; heap_type < NUM_HEAP_TYPES; heap_type++) {
hdest = dest->heap[heap_type];
hsrc = src->heap[heap_type];
hdest = dest->heap->heap[heap_type];
hsrc = src->heap->heap[heap_type];
if (hdest && hsrc) {
gc_heap_merge(hdest, hsrc);
ck_pr_add_64(&(dest->cached_heap_total_sizes[heap_type]),
ck_pr_load_64(&(src->cached_heap_total_sizes[heap_type])));
ck_pr_add_64(&(dest->cached_heap_free_sizes[heap_type]),
ck_pr_load_64(&(src->cached_heap_free_sizes[heap_type])));
}
}
fprintf(stderr, "Finished merging old heap data\n");
}
/**

3
include/cyclone/types.h
View file

@ -221,6 +221,7 @@ struct gc_thread_data_t {
void **mark_buffer;
int mark_buffer_len;
pthread_mutex_t lock;
pthread_mutex_t heap_lock;
pthread_t thread_id;
gc_heap_root *heap;
uint64_t *cached_heap_free_sizes;
@ -663,7 +664,7 @@ gc_heap *gc_heap_create(int heap_type, size_t size, size_t max_size,
size_t chunk_size, gc_thread_data *thd);
gc_heap *gc_heap_free(gc_heap *page, gc_heap *prev_page);
void gc_heap_merge(gc_heap *hdest, gc_heap *hsrc);
void gc_heap_merge_all(gc_heap_root *dest, gc_heap_root *src);
void gc_merge_all_heaps(gc_thread_data *dest, gc_thread_data *src);
void gc_print_stats(gc_heap * h);
int gc_grow_heap(gc_heap * h, int heap_type, size_t size, size_t chunk_size, gc_thread_data *thd);
char *gc_copy_obj(object hp, char *obj, gc_thread_data * thd);