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Merge #6474: perf: NodesSnapshot, do not hold m_nodes_mutex while shuffling

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c005011e84 perf: NodesSnapshot, do not hold m_nodes_mutex while shuffling (pasta)

Pull request description:

  ## Issue being fixed or feature implemented
  Upstream, as expected, only holds m_nodes_mutex while needed. We hold it a bit too long 36f5effa17/src/net.h (L1628-L1640)

  Not sure how this got introduced. I also don't expect this to be a major contention savior, as there is only one instance in ThreadMessageHandler where we actually do shuffle, but still, might as well fix.

  ## What was done?

  ## How Has This Been Tested?
  builds

  ## Breaking Changes
  None

  ## Checklist:
    _Go over all the following points, and put an `x` in all the boxes that apply._
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  kwvg:
    utACK c005011e84
  UdjinM6:
    utACK c005011e84

Tree-SHA512: 76a848ace9a746c851e0fc1f66def92d67da92e9f295b7aade5a23f7d76b3eb3c28b7a6ac9d04df6dc252c1f1d9fae364821e9416a1f003a2905a30fc51eb41f
This commit is contained in:
pasta 2024-12-10 12:28:36 -06:00
commit 35fa4806eb
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1 changed files with 8 additions and 8 deletions
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16
src/net.cpp
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@ -5118,16 +5118,16 @@ bool CConnman::IsMasternodeOrDisconnectRequested(const CService& addr) {
CConnman::NodesSnapshot::NodesSnapshot(const CConnman& connman, std::function<bool(const CNode* pnode)> filter,
bool shuffle)
{
LOCK(connman.m_nodes_mutex);
m_nodes_copy.reserve(connman.m_nodes.size());
{
LOCK(connman.m_nodes_mutex);
m_nodes_copy.reserve(connman.m_nodes.size());
for (auto& node : connman.m_nodes) {
if (!filter(node))
continue;
node->AddRef();
m_nodes_copy.push_back(node);
for (auto& node : connman.m_nodes) {
if (!filter(node)) continue;
node->AddRef();
m_nodes_copy.push_back(node);
}
}
if (shuffle) {
Shuffle(m_nodes_copy.begin(), m_nodes_copy.end(), FastRandomContext{});
}