Reduce cs_main locks during ConnectTip/SyncWithWallets #7946

pull jonasschnelli wants to merge 1 commits into bitcoin:master from jonasschnelli:2016/04/cs_main_wallet changing 7 files +49 −54
  1. jonasschnelli commented at 12:03 pm on April 26, 2016: contributor
    DisconnectTip and AcceptToMempool are still holding cs_main (not intended to improve this in this PR)
  2. jonasschnelli added the label Refactoring on Apr 26, 2016
  3. in src/main.cpp: in 480ed4f30f outdated 
    2917+        // while _not_ holding the cs_main lock
2918+        BOOST_FOREACH(const CTransaction &tx, txConflicted) {
2919+            SyncWithWallets(tx, pindexNewTip, NULL);
2920+        }
2921+        // ... and about transactions that got confirmed:
2922+        BOOST_FOREACH(const CTransaction &tx, pblock->vtx) {
    sipa commented at 12:05 pm on April 26, 2016:
    This is not correct, it needs to iterate through all the blocks that got connected, not just the new tip.
  4. jonasschnelli force-pushed on Apr 26, 2016
  5. jonasschnelli force-pushed on Apr 26, 2016
  6. jonasschnelli commented at 1:42 pm on April 26, 2016: contributor

    As always when you want to improve the locking a little bit, the change gets quickly more invasive.

    Update serval things:

    • Fixed @sipa point (iterate though all connected blocks).
    • Removed the CBlock * parameter from the SyncTransaction signal and added CBlockIndex* together with int posInBlock.
    • Updated the wallet logic that it can handle the slightly different signal.
  7. jonasschnelli force-pushed on Apr 26, 2016
  8. jonasschnelli force-pushed on Apr 26, 2016
  9. kazcw commented at 2:17 pm on April 27, 2016: contributor
    ActivateBestChainStep reuses a vector for ConnectTip’s txConflicted to combine results from multiple blocks. ConnectTip passes txConflicted to mempoool.removeForBlock every time.
  10. in src/main.cpp: in 086654e4fd outdated 
    2926+        for(unsigned int i = 0; i < txChanged.size(); i++)
2927+            SyncWithWallets(txChanged[i].get<0>(), txChanged[i].get<1>(), txChanged[i].get<2>());
2928+
2929         // When we reach this point, we switched to a new tip (stored in pindexNewTip).
2930 
2931         // Notifications/callbacks that can run without cs_main
    kazcw commented at 2:19 pm on April 27, 2016:
    Could put the new loops below this comment with the other non-cs_main notifications
  11. in src/wallet/wallet.cpp: in 086654e4fd outdated 
    1223@@ -1224,7 +1224,14 @@ int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
1224             ReadBlockFromDisk(block, pindex, Params().GetConsensus());
1225             BOOST_FOREACH(CTransaction& tx, block.vtx)
    kazcw commented at 2:33 pm on April 27, 2016:
    Why not just change this loop to be numeric and then use the i?
    jonasschnelli commented at 9:40 am on May 6, 2016:
    Right. This loop is stupid at this point. The transaction always have a posInBlock. Will update.
  12. in src/wallet/wallet.cpp: in 086654e4fd outdated 
    3309     // Is the tx in a block that's in the main chain
3310-    BlockMap::iterator mi = mapBlockIndex.find(hashBlock);
3311-    if (mi == mapBlockIndex.end())
3312-        return 0;
3313-    const CBlockIndex* pindex = (*mi).second;
3314     if (!pindex || !chainActive.Contains(pindex))
    kazcw commented at 2:39 pm on April 27, 2016:
    Could remove the null-check; pindex has already been dereferenced
  13. jonasschnelli force-pushed on May 6, 2016
  14. jonasschnelli commented at 9:48 am on May 6, 2016: contributor

    @kazcw Thanks for the detailed code review!

    Added a squashme commit with fixed for issues found by @kazcw.

  15. kazcw commented at 1:57 pm on May 6, 2016: contributor
    You know what, I misread. txConflicted is an out-only parameter all the way down the call stack, so it was fine without the txConflictedCurrent. Sorry about that.
  16. sipa commented at 2:18 pm on May 25, 2016: member
    Needs rebase.
  17. in src/main.cpp: in e8ea3dd5ea outdated 
    43@@ -44,6 +44,7 @@
44 #include <boost/filesystem/fstream.hpp>
45 #include <boost/math/distributions/poisson.hpp>
46 #include <boost/thread.hpp>
47+#include <boost/tuple/tuple.hpp>
    sipa commented at 2:19 pm on May 25, 2016:
    Use std::tuple instead?
  18. in src/main.cpp: in e8ea3dd5ea outdated 
    2723@@ -2723,19 +2724,14 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
2724     int64_t nTime5 = GetTimeMicros(); nTimeChainState += nTime5 - nTime4;
2725     LogPrint("bench", "  - Writing chainstate: %.2fms [%.2fs]\n", (nTime5 - nTime4) * 0.001, nTimeChainState * 0.000001);
2726     // Remove conflicting transactions from the mempool.
2727-    list<CTransaction> txConflicted;
2728+    list<CTransaction> txConflictedCurrent;
2729     mempool.removeForBlock(pblock->vtx, pindexNew->nHeight, txConflicted, !IsInitialBlockDownload());
2730+    txConflicted.insert(txConflicted.end(), txConflictedCurrent.begin(), txConflictedCurrent.end());
    sipa commented at 2:22 pm on May 25, 2016:
    This looks like it is not doing anything, as txConflictedCurrent will always be empty?
    jonasschnelli commented at 2:34 pm on May 25, 2016:
    Oh. Right. L2728 should make use of the txConflictedCurrent. Fixed.
  19. jonasschnelli force-pushed on May 25, 2016
  20. jonasschnelli commented at 2:34 pm on May 25, 2016: contributor
    Rebased, fixed sipas found issue and switched to std::tuple
  21. in src/main.cpp: in 9471f32a8f outdated 
    2716@@ -2717,19 +2717,14 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
2717     int64_t nTime5 = GetTimeMicros(); nTimeChainState += nTime5 - nTime4;
2718     LogPrint("bench", "  - Writing chainstate: %.2fms [%.2fs]\n", (nTime5 - nTime4) * 0.001, nTimeChainState * 0.000001);
2719     // Remove conflicting transactions from the mempool.
2720-    list<CTransaction> txConflicted;
2721-    mempool.removeForBlock(pblock->vtx, pindexNew->nHeight, txConflicted, !IsInitialBlockDownload());
2722+    list<CTransaction> txConflictedCurrent;
2723+    mempool.removeForBlock(pblock->vtx, pindexNew->nHeight, txConflictedCurrent, !IsInitialBlockDownload());
2724+    txConflicted.insert(txConflicted.end(), txConflictedCurrent.begin(), txConflictedCurrent.end());
    sipa commented at 2:36 pm on May 25, 2016:
    Why a temporary variable, and not just pass vchConflicted to mempool.removeForBlock()? txConflictedCurrent is not used elsewhere.
    jonasschnelli commented at 2:39 pm on May 25, 2016:

    Without a temporary variable, mempool.removeForBlock would always work though the combined list txConflicted that was initialized here.

    Although I’m not sure if this would be a problem, but at least it would slightly change current masters behavior.

    sipa commented at 2:44 pm on May 25, 2016:
    “Work through”? All that function does is append deleted CTransactions to it.
    jonasschnelli commented at 2:48 pm on May 25, 2016:
    Yes. Your right. Removed the temp. var.
  22. jonasschnelli force-pushed on May 25, 2016
  23. in src/main.cpp: in 580a665a97 outdated 
    2911@@ -2919,6 +2912,8 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
2912 
2913         CBlockIndex *pindexNewTip = NULL;
2914         const CBlockIndex *pindexFork;
2915+        std::list<CTransaction> txConflicted;
2916+        std::vector<std::tuple<CTransaction,CBlockIndex*,int> > txChanged;
    sipa commented at 3:44 pm on May 25, 2016:
    Sorry for changing my mind, but can you define a struct for this instead? Larger tuples don’t really have good readability.
    jonasschnelli commented at 3:57 pm on May 25, 2016:
    IMO tuple is ideal for a such use case. It’s only a temporary variable and its scope is very small. IMO an custom struct seems to be over complex.
    sipa commented at 5:25 pm on May 25, 2016:
    Fair enough.
    laanwj commented at 7:50 pm on June 2, 2016:
    c++ needs collections.namedtuple :)
    dcousens commented at 0:31 am on June 3, 2016:
    given the repeated use, maybe just typedef the std::tuple? tuple has some nice conveniences over a struct alternative.
  24. in src/main.cpp: in 580a665a97 outdated 
    2940@@ -2946,6 +2941,15 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
2941         // When we reach this point, we switched to a new tip (stored in pindexNewTip).
2942 
2943         // Notifications/callbacks that can run without cs_main
2944+
2945+        // throw all transactions though the signal-interface
2946+        // while _not_ holding the cs_main lock
2947+        BOOST_FOREACH(const CTransaction &tx, txConflicted)
2948+        SyncWithWallets(tx, pindexNewTip);
    sipa commented at 3:47 pm on May 25, 2016:
    Indentation (and braces).
    jonasschnelli commented at 3:58 pm on May 25, 2016:
    Fixed Indentation and braces.
  25. jonasschnelli force-pushed on May 25, 2016
  26. in src/wallet/wallet.cpp: in fdf8a5efe0 outdated 
    911@@ -912,11 +912,11 @@ void CWallet::MarkConflicted(const uint256& hashBlock, const uint256& hashTx)
912     }
913 }
914 
915-void CWallet::SyncTransaction(const CTransaction& tx, const CBlockIndex *pindex, const CBlock* pblock)
916+void CWallet::SyncTransaction(const CTransaction& tx, const CBlockIndex *pindex, int posInBlock)
917 {
918     LOCK2(cs_main, cs_wallet);
    sipa commented at 5:21 pm on May 25, 2016:
    This cs_main is unfortunate, but I guess we can get rid of it in a follow-up.
  27. sipa commented at 5:22 pm on May 25, 2016: member
    utACK fdf8a5efe03004f4a581ba41b87737a4e1f1ff44
  28. dcousens commented at 0:32 am on June 3, 2016: contributor
    utACK fdf8a5e
  29. laanwj commented at 1:32 pm on June 10, 2016: member
    utACK fdf8a5e, but the squashme commits need squashing
  30. jonasschnelli force-pushed on Jun 10, 2016
  31. jonasschnelli commented at 3:09 pm on June 10, 2016: contributor
    Squashed.
  32. in src/wallet/wallet.cpp: in d31dd19655 outdated 
    762 {
763     {
764         AssertLockHeld(cs_wallet);
765 
766-        if (pblock) {
767+        if (pIndex) {
    sipa commented at 2:28 pm on June 11, 2016:
    Shouldn’t this be if (posInBlock != -1) { instead? pindex is always passed, even when the transaction was removed.
  33. jonasschnelli force-pushed on Jul 20, 2016
  34. jonasschnelli commented at 12:37 pm on July 20, 2016: contributor
    Squashed the squashme commit. Anything holding this back?
  35. jtimon commented at 7:29 pm on July 20, 2016: contributor
    Decide on struct vs typedef of std::tuple<CTransaction,CBlockIndex*,int> (or just leave it as it is now, I guess)? No strong opinion on that. Fast review ACK 0d54074
  36. laanwj commented at 9:56 am on August 3, 2016: member
    Needs rebase.
  37. Reduce cs_main locks during ConnectTip/SyncWithWallets b3b3c2a562
  38. jonasschnelli force-pushed on Aug 12, 2016
  39. jonasschnelli commented at 12:54 pm on August 12, 2016: contributor
    Rebased.
  40. sipa merged this on Aug 15, 2016
  41. sipa closed this on Aug 15, 2016
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jonasschnelli sipa kazcw laanwj dcousens jtimon

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