low-hanging performance optimizations #8
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This commit implements several low-hanging performance optimizations
that achieve significant speedups across all benchmark scenarios:
1. **Eliminate unnecessary clones** (14-37% improvement)
- Removed `.clone()` calls in PermissionChecker, AndPolicy, OrPolicy,
and NotPolicy where results were being cloned unnecessarily
- Changed to move semantics by extracting needed data first, then
moving the result into vectors
2. **Pre-allocate vectors** (1-3% improvement)
- Added `Vec::with_capacity()` in PermissionChecker, AndPolicy, and
OrPolicy to avoid dynamic reallocations during policy evaluation
- Pre-allocates based on the known number of policies
3. **Improve short-circuit logic** (2-7% improvement for success cases)
- Restructured PermissionChecker to check result immediately after
policy evaluation
- When a policy grants access, return immediately with minimal data
extraction (policy_type and reason only)
- Avoid expensive metadata extraction and tracing setup for the
short-circuit path
- Only extract full metadata and trace for denied policies
**Benchmark Results:**
- 1 policy: 18-22% faster
- 4 policies: 27-35% faster
- 16 policies: 27-33% faster
- 64 policies: 25-26% faster
All optimizations use safe Rust code with no unsafe blocks, maintain
backward compatibility, and pass all existing tests.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Restored the security tracing event emission for all policy evaluations, including when a policy grants access and we short-circuit. This is critical for security audit and compliance requirements. Previous commit incorrectly skipped tracing when short-circuiting on granted access. This change ensures that all policy evaluations are properly logged with their security metadata, regardless of outcome. The optimizations still provide significant performance improvements (19-37% faster) while maintaining proper audit trail: - Clone elimination in policy result handling - Vector pre-allocation for policy results - Short-circuit return after tracing (not before) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull Request Overview
This PR implements performance optimizations in the policy evaluation system by eliminating unnecessary clones, pre-allocating vectors, and improving short-circuit logic. The changes achieve 18-35% performance improvements across different policy counts by reducing allocations and avoiding redundant operations.
Key changes:
- Removed unnecessary
.clone()calls in policy evaluation by extracting needed data before moving results - Pre-allocated vectors with known capacities to avoid dynamic reallocations
- Extracted
is_granted()results before moving to enable proper short-circuiting after push operations
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hardbyte
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hardbyte
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Implements several low-hanging performance optimizations:
Eliminate unnecessary clones (14-37% improvement)
.clone()calls in PermissionChecker, AndPolicy, OrPolicy, and NotPolicy where results were being cloned unnecessarilyPre-allocate vectors (1-3% improvement)
Vec::with_capacity()in PermissionChecker, AndPolicy, and OrPolicy to avoid dynamic reallocations during policy evaluationImprove short-circuit logic (2-7% improvement for success cases)
Benchmark Results: