diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/src/__support/GPU/allocator.cpp | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/libc/src/__support/GPU/allocator.cpp b/libc/src/__support/GPU/allocator.cpp index 3da339c..813a2a4 100644 --- a/libc/src/__support/GPU/allocator.cpp +++ b/libc/src/__support/GPU/allocator.cpp @@ -43,6 +43,9 @@ constexpr static uint32_t MAX_TRIES = 1024; // The number of previously allocated slabs we will keep in memory. constexpr static uint32_t CACHED_SLABS = 8; +// Configuration for whether or not we will return unused slabs to memory. +constexpr static bool RECLAIM = true; + static_assert(!(ARRAY_SIZE & (ARRAY_SIZE - 1)), "Must be a power of two"); namespace impl { @@ -399,7 +402,7 @@ private: // and obtain exclusive rights to deconstruct it. If the CAS failed either // another thread resurrected the counter and we quit, or a parallel read // helped us invalidating it. For the latter, claim that flag and return. - if (counter.fetch_sub(n, cpp::MemoryOrder::RELAXED) == n) { + if (counter.fetch_sub(n, cpp::MemoryOrder::RELAXED) == n && RECLAIM) { uint32_t expected = 0; if (counter.compare_exchange_strong(expected, INVALID, cpp::MemoryOrder::RELAXED, @@ -417,8 +420,9 @@ private: // thread. uint64_t read() { auto val = counter.load(cpp::MemoryOrder::RELAXED); - if (val == 0 && counter.compare_exchange_strong( - val, INVALID | HELPED, cpp::MemoryOrder::RELAXED)) + if (val == 0 && RECLAIM && + counter.compare_exchange_strong(val, INVALID | HELPED, + cpp::MemoryOrder::RELAXED)) return 0; return (val & INVALID) ? 0 : val; } @@ -463,7 +467,7 @@ private: return nullptr; cpp::atomic_thread_fence(cpp::MemoryOrder::ACQUIRE); - return ptr.load(cpp::MemoryOrder::RELAXED); + return RECLAIM ? ptr.load(cpp::MemoryOrder::RELAXED) : expected; } // Finalize the associated memory and signal that it is ready to use by |