Mercurial > hg > graal-jvmci-8
diff src/share/vm/memory/collectorPolicy.cpp @ 8853:2e093b564241
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
Summary: Keep a counter of how many times we were stalled by the GC locker, add a diagnostic flag which sets the limit.
Reviewed-by: brutisso, ehelin, johnc
author | mgerdin |
---|---|
date | Thu, 28 Mar 2013 10:27:28 +0100 |
parents | 82657b6a8cc0 |
children | 6f817ce50129 |
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--- a/src/share/vm/memory/collectorPolicy.cpp Wed Mar 27 10:55:37 2013 +0100 +++ b/src/share/vm/memory/collectorPolicy.cpp Thu Mar 28 10:27:28 2013 +0100 @@ -532,7 +532,7 @@ // Loop until the allocation is satisified, // or unsatisfied after GC. - for (int try_count = 1; /* return or throw */; try_count += 1) { + for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { HandleMark hm; // discard any handles allocated in each iteration // First allocation attempt is lock-free. @@ -576,6 +576,10 @@ } } + if (gclocker_stalled_count > GCLockerRetryAllocationCount) { + return NULL; // we didn't get to do a GC and we didn't get any memory + } + // If this thread is not in a jni critical section, we stall // the requestor until the critical section has cleared and // GC allowed. When the critical section clears, a GC is @@ -587,6 +591,7 @@ MutexUnlocker mul(Heap_lock); // Wait for JNI critical section to be exited GC_locker::stall_until_clear(); + gclocker_stalled_count += 1; continue; } else { if (CheckJNICalls) {