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comparison src/share/vm/runtime/deoptimization.cpp @ 5114:dad1ac9dba7d

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finished first implementation of disabling runtime feedback selectively based on deoptimization history
author Christian Haeubl <christian.haeubl@oracle.com>
date Mon, 19 Mar 2012 14:43:15 -0700
parents 0ebca2e35ca5
children 34518fd74518
comparison
equal deleted inserted replaced
5113:e6a45067e42c 5114:dad1ac9dba7d
1500 if (ProfileTraps && update_trap_state && trap_mdo.not_null()) { 1500 if (ProfileTraps && update_trap_state && trap_mdo.not_null()) {
1501 assert(trap_mdo() == get_method_data(thread, trap_method, false), "sanity"); 1501 assert(trap_mdo() == get_method_data(thread, trap_method, false), "sanity");
1502 uint this_trap_count = 0; 1502 uint this_trap_count = 0;
1503 bool maybe_prior_trap = false; 1503 bool maybe_prior_trap = false;
1504 bool maybe_prior_recompile = false; 1504 bool maybe_prior_recompile = false;
1505 pdata = query_update_method_data(trap_mdo, trap_bci, reason, 1505 pdata = query_update_method_data(trap_mdo, trap_bci, reason, true,
1506 //outputs: 1506 //outputs:
1507 this_trap_count, 1507 this_trap_count,
1508 maybe_prior_trap, 1508 maybe_prior_trap,
1509 maybe_prior_recompile); 1509 maybe_prior_recompile);
1510 // Because the interpreter also counts null, div0, range, and class 1510 // Because the interpreter also counts null, div0, range, and class
1634 1634
1635 ProfileData* 1635 ProfileData*
1636 Deoptimization::query_update_method_data(methodDataHandle trap_mdo, 1636 Deoptimization::query_update_method_data(methodDataHandle trap_mdo,
1637 int trap_bci, 1637 int trap_bci,
1638 Deoptimization::DeoptReason reason, 1638 Deoptimization::DeoptReason reason,
1639 bool update_total_trap_count,
1639 //outputs: 1640 //outputs:
1640 uint& ret_this_trap_count, 1641 uint& ret_this_trap_count,
1641 bool& ret_maybe_prior_trap, 1642 bool& ret_maybe_prior_trap,
1642 bool& ret_maybe_prior_recompile) { 1643 bool& ret_maybe_prior_recompile) {
1643 uint prior_trap_count = trap_mdo->trap_count(reason); 1644 bool maybe_prior_trap = false;
1644 uint this_trap_count = trap_mdo->inc_trap_count(reason); 1645 bool maybe_prior_recompile = false;
1645 1646 uint this_trap_count = 0;
1646 // If the runtime cannot find a place to store trap history, 1647 if (update_total_trap_count) {
1647 // it is estimated based on the general condition of the method. 1648 uint prior_trap_count = trap_mdo->trap_count(reason);
1648 // If the method has ever been recompiled, or has ever incurred 1649 this_trap_count = trap_mdo->inc_trap_count(reason);
1649 // a trap with the present reason , then this BCI is assumed 1650
1650 // (pessimistically) to be the culprit. 1651 // If the runtime cannot find a place to store trap history,
1651 bool maybe_prior_trap = (prior_trap_count != 0); 1652 // it is estimated based on the general condition of the method.
1652 bool maybe_prior_recompile = (trap_mdo->decompile_count() != 0); 1653 // If the method has ever been recompiled, or has ever incurred
1654 // a trap with the present reason , then this BCI is assumed
1655 // (pessimistically) to be the culprit.
1656 maybe_prior_trap = (prior_trap_count != 0);
1657 maybe_prior_recompile = (trap_mdo->decompile_count() != 0);
1658 }
1659
1660 // For reasons which are recorded per bytecode, we check per-BCI data.
1653 ProfileData* pdata = NULL; 1661 ProfileData* pdata = NULL;
1654
1655
1656 // For reasons which are recorded per bytecode, we check per-BCI data.
1657 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason); 1662 DeoptReason per_bc_reason = reason_recorded_per_bytecode_if_any(reason);
1663 assert(per_bc_reason != NULL || update_total_trap_count, "must be");
1658 if (per_bc_reason != Reason_none) { 1664 if (per_bc_reason != Reason_none) {
1659 // Find the profile data for this BCI. If there isn't one, 1665 // Find the profile data for this BCI. If there isn't one,
1660 // try to allocate one from the MDO's set of spares. 1666 // try to allocate one from the MDO's set of spares.
1661 // This will let us detect a repeated trap at this point. 1667 // This will let us detect a repeated trap at this point.
1662 pdata = trap_mdo->allocate_bci_to_data(trap_bci); 1668 pdata = trap_mdo->allocate_bci_to_data(trap_bci);
1697 ResourceMark rm; 1703 ResourceMark rm;
1698 // Ignored outputs: 1704 // Ignored outputs:
1699 uint ignore_this_trap_count; 1705 uint ignore_this_trap_count;
1700 bool ignore_maybe_prior_trap; 1706 bool ignore_maybe_prior_trap;
1701 bool ignore_maybe_prior_recompile; 1707 bool ignore_maybe_prior_recompile;
1708 // Graal uses the total counts to determine if deoptimizations are happening too frequently -> do not adjust total counts
1709 bool update_total_counts = IS_GRAAL(false) NOT_GRAAL(true);
1702 query_update_method_data(trap_mdo, trap_bci, 1710 query_update_method_data(trap_mdo, trap_bci,
1703 (DeoptReason)reason, 1711 (DeoptReason)reason,
1712 update_total_counts,
1704 ignore_this_trap_count, 1713 ignore_this_trap_count,
1705 ignore_maybe_prior_trap, 1714 ignore_maybe_prior_trap,
1706 ignore_maybe_prior_recompile); 1715 ignore_maybe_prior_recompile);
1707 } 1716 }
1708 1717