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Revert r11835 'Unify promotion and allocation limit computation' due to V8 Splay performance regression on Mac.

Browse Source 
R=mstarzinger@chromium.org
BUG=134183

Review URL: https://chromiumcodereview.appspot.com/10664013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11916 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
ulan@chromium.org 2012-06-25 09:14:47 +00:00
parent 32a6a29cc8
commit 781484365b
2 changed files with 19 additions and 8 deletions
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8
src/heap.cc
View File

@ -118,8 +118,8 @@ Heap::Heap()
debug_utils_(NULL),
#endif // DEBUG
new_space_high_promotion_mode_active_(false),
old_gen_promotion_limit_(kMinPromotionLimit),
old_gen_allocation_limit_(kMinAllocationLimit),
old_gen_promotion_limit_(kMinimumPromotionLimit),
old_gen_allocation_limit_(kMinimumAllocationLimit),
old_gen_limit_factor_(1),
size_of_old_gen_at_last_old_space_gc_(0),
external_allocation_limit_(0),
@ -829,9 +829,9 @@ bool Heap::PerformGarbageCollection(GarbageCollector collector,
}
old_gen_promotion_limit_ =
OldGenLimit(size_of_old_gen_at_last_old_space_gc_, kMinPromotionLimit);
OldGenPromotionLimit(size_of_old_gen_at_last_old_space_gc_);
old_gen_allocation_limit_ =
OldGenLimit(size_of_old_gen_at_last_old_space_gc_, kMinAllocationLimit);
OldGenAllocationLimit(size_of_old_gen_at_last_old_space_gc_);
old_gen_exhausted_ = false;
} else {

19
src/heap.h
View File

@ -1359,13 +1359,24 @@ class Heap {
return max_old_generation_size_ - PromotedTotalSize();
}
static const intptr_t kMinPromotionLimit = 5 * Page::kPageSize;
static const intptr_t kMinAllocationLimit =
static const intptr_t kMinimumPromotionLimit = 5 * Page::kPageSize;
static const intptr_t kMinimumAllocationLimit =
8 * (Page::kPageSize > MB ? Page::kPageSize : MB);
intptr_t OldGenLimit(intptr_t old_gen_size, intptr_t min_limit) {
intptr_t OldGenPromotionLimit(intptr_t old_gen_size) {
const int divisor = FLAG_stress_compaction ? 10 : 3;
intptr_t limit =
Max(old_gen_size + old_gen_size / divisor, kMinimumPromotionLimit);
limit += new_space_.Capacity();
limit *= old_gen_limit_factor_;
intptr_t halfway_to_the_max = (old_gen_size + max_old_generation_size_) / 2;
return Min(limit, halfway_to_the_max);
}
intptr_t OldGenAllocationLimit(intptr_t old_gen_size) {
const int divisor = FLAG_stress_compaction ? 8 : 2;
intptr_t limit = Max(old_gen_size + old_gen_size / divisor, min_limit);
intptr_t limit =
Max(old_gen_size + old_gen_size / divisor, kMinimumAllocationLimit);
limit += new_space_.Capacity();
limit *= old_gen_limit_factor_;
intptr_t halfway_to_the_max = (old_gen_size + max_old_generation_size_) / 2;