Phase 2: Complete RPC tracing — interface, macros, attributes, tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

include/xrpl/basics/MallocTrim.h

@@ -1,73 +0,0 @@
-#pragma once
-
-#include <xrpl/beast/utility/Journal.h>
-
-#include <chrono>
-#include <cstdint>
-#include <string_view>
-
-namespace xrpl {
-
-// cSpell:ignore ptmalloc
-
-// -----------------------------------------------------------------------------
-// Allocator interaction note:
-// - This facility invokes glibc's malloc_trim(0) on Linux/glibc to request that
-//   ptmalloc return free heap pages to the OS.
-// - If an alternative allocator (e.g. jemalloc or tcmalloc) is linked or
-//   preloaded (LD_PRELOAD), calling glibc's malloc_trim typically has no effect
-//   on the *active* heap. The call is harmless but may not reclaim memory
-//   because those allocators manage their own arenas.
-// - Only glibc sbrk/arena space is eligible for trimming; large mmap-backed
-//   allocations are usually returned to the OS on free regardless of trimming.
-// - Call at known reclamation points (e.g., after cache sweeps / online delete)
-//   and consider rate limiting to avoid churn.
-// -----------------------------------------------------------------------------
-
-struct MallocTrimReport
-{
-    bool supported{false};
-    int trimResult{-1};
-    std::int64_t rssBeforeKB{-1};
-    std::int64_t rssAfterKB{-1};
-    std::chrono::microseconds durationUs{-1};
-    std::int64_t minfltDelta{-1};
-    std::int64_t majfltDelta{-1};
-
-    [[nodiscard]] std::int64_t
-    deltaKB() const noexcept
-    {
-        if (rssBeforeKB < 0 || rssAfterKB < 0)
-            return 0;
-        return rssAfterKB - rssBeforeKB;
-    }
-};
-
-/**
- * @brief Attempt to return freed memory to the operating system.
- *
- * On Linux with glibc malloc, this issues ::malloc_trim(0), which may release
- * free space from ptmalloc arenas back to the kernel. On other platforms, or if
- * a different allocator is in use, this function is a no-op and the report will
- * indicate that trimming is unsupported or had no effect.
- *
- * @param tag     Identifier for logging/debugging purposes.
- * @param journal Journal for diagnostic logging.
- * @return Report containing before/after metrics and the trim result.
- *
- * @note If an alternative allocator (jemalloc/tcmalloc) is linked or preloaded,
- *       calling glibc's malloc_trim may have no effect on the active heap. The
- *       call is harmless but typically does not reclaim memory under those
- *       allocators.
- *
- * @note Only memory served from glibc's sbrk/arena heaps is eligible for trim.
- *       Large allocations satisfied via mmap are usually returned on free
- *       independently of trimming.
- *
- * @note Intended for use after operations that free significant memory (e.g.,
- *       cache sweeps, ledger cleanup, online delete). Consider rate limiting.
- */
-MallocTrimReport
-mallocTrim(std::string_view tag, beast::Journal journal);
-
-}  // namespace xrpl

include/xrpl/nodestore/Backend.h

@@ -77,16 +77,16 @@ public:
         If the object is not found or an error is encountered, the
         result will indicate the condition.
         @note This will be called concurrently.
-        @param hash The hash of the object.
+        @param key A pointer to the key data.
         @param pObject [out] The created object if successful.
         @return The result of the operation.
     */
     virtual Status
-    fetch(uint256 const& hash, std::shared_ptr<NodeObject>* pObject) = 0;
+    fetch(void const* key, std::shared_ptr<NodeObject>* pObject) = 0;
 
     /** Fetch a batch synchronously. */
     virtual std::pair<std::vector<std::shared_ptr<NodeObject>>, Status>
-    fetchBatch(std::vector<uint256> const& hashes) = 0;
+    fetchBatch(std::vector<uint256 const*> const& hashes) = 0;
 
     /** Store a single object.
         Depending on the implementation this may happen immediately

include/xrpl/protocol/detail/features.macro

@@ -15,10 +15,9 @@
 
 // Add new amendments to the top of this list.
 // Keep it sorted in reverse chronological order.
-
 XRPL_FIX   (PermissionedDomainInvariant, Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FIX    (ExpiredNFTokenOfferRemoval, Supported::yes, VoteBehavior::DefaultNo)
-XRPL_FIX    (BatchInnerSigs,             Supported::no, VoteBehavior::DefaultNo)
+XRPL_FIX    (BatchInnerSigs,             Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FEATURE(LendingProtocol,            Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FEATURE(PermissionDelegationV1_1,   Supported::no,  VoteBehavior::DefaultNo)
 XRPL_FIX    (DirectoryLimit,             Supported::yes, VoteBehavior::DefaultNo)
@@ -32,7 +31,7 @@ XRPL_FEATURE(TokenEscrow,                Supported::yes, VoteBehavior::DefaultNo
 XRPL_FIX    (EnforceNFTokenTrustlineV2,  Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FIX    (AMMv1_3,                    Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FEATURE(PermissionedDEX,            Supported::yes, VoteBehavior::DefaultNo)
-XRPL_FEATURE(Batch,                      Supported::no,  VoteBehavior::DefaultNo)
+XRPL_FEATURE(Batch,                      Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FEATURE(SingleAssetVault,           Supported::yes,  VoteBehavior::DefaultNo)
 XRPL_FIX    (PayChanCancelAfter,         Supported::yes, VoteBehavior::DefaultNo)
 // Check flags in Credential transactions

include/xrpl/telemetry/Telemetry.h

@@ -157,6 +157,10 @@ public:
     virtual bool
     shouldTracePeer() const = 0;
 
+    /** @return true if ledger close/accept should be traced. */
+    virtual bool
+    shouldTraceLedger() const = 0;
+
 #ifdef XRPL_ENABLE_TELEMETRY
     /** Get or create a named tracer instance.