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GC: avoid trying to prime a full page cache

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This commit is contained in:
Matthew Flatt 2016-05-15 13:03:47 -06:00
parent 49fd1e41da
commit 7fbe6a4097
1 changed files with 29 additions and 3 deletions
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32
racket/src/racket/gc2/alloc_cache.c
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@ -56,8 +56,16 @@ static void alloc_cache_collapse_pages(AllocCacheBlock *blockfree)
int i;
int j;
/* sort by AllocCacheBlock->start */
my_qsort(blockfree, BLOCKFREE_CACHE_SIZE, sizeof(AllocCacheBlock), alloc_cache_block_compare);
/* Sorted already? */
for (i = 1; i < BLOCKFREE_CACHE_SIZE; i++) {
if (blockfree[i-1].start > blockfree[i].start)
break;
}
if (i < BLOCKFREE_CACHE_SIZE) {
/* sort by AllocCacheBlock->start */
my_qsort(blockfree, BLOCKFREE_CACHE_SIZE, sizeof(AllocCacheBlock), alloc_cache_block_compare);
}
/* collapse adjacent: */
j = 0;
@ -183,6 +191,18 @@ static intptr_t alloc_cache_flush_freed_pages(AllocCacheBlock *blockfree)
return freed;
}
static int alloc_cache_is_full(AllocCacheBlock *blockfree)
{
int i;
for (i = 0; i < BLOCKFREE_CACHE_SIZE; i++) {
if (!blockfree[i].start)
return 0;
}
return 1;
}
#ifndef NO_ALLOC_CACHE_FREE
static intptr_t alloc_cache_free_all_pages(AllocCacheBlock *blockfree)
{
@ -220,7 +240,13 @@ static void *alloc_cache_alloc_page(AllocCacheBlock *blockfree, size_t len, siz
r = alloc_cache_find_pages(blockfree, len, alignment, dirty_ok);
if(!r) {
/* attempt to allocate from OS */
size_t extra = (alignment ? (alignment + CACHE_SEED_PAGES * APAGE_SIZE) : 0);
size_t extra;
if (alloc_cache_is_full(blockfree))
extra = alignment;
else
extra = (alignment ? (alignment + CACHE_SEED_PAGES * APAGE_SIZE) : 0);
r = os_alloc_pages(len + extra);
if(!r) { return NULL; }