tracing: drop block_connected hash.toString() arg

The tracepoint `validation:block_connected` was introduced in #22006.
The first argument was the hash of the connected block as a pointer
to a C-like String. The last argument passed the hash of the
connected block as a pointer to 32 bytes. The hash was only passed as
string to allow `bpftrace` scripts to print the hash. It was
(incorrectly) assumed that `bpftrace` cannot hex-format and print the
block hash given only the hash as bytes.

The block hash can be printed in `bpftrace` by calling
`printf("%02x")` for each byte of the hash in an `unroll () {...}`.
By starting from the last byte of the hash, it can be printed in
big-endian (the block-explorer format).

```C
  $p = $hash + 31;
  unroll(32) {
      $b = *(uint8*)$p;
      printf("%02x", $b);
      $p -= 1;
  }
```

See also: https://github.com/bitcoin/bitcoin/pull/22902#discussion_r705176691

This is a breaking change to the block_connected tracepoint API, however
this tracepoint has not yet been included in a release.

2 files changed, 15 insertions, 14 deletions

diff --git a/contrib/tracing/README.md b/contrib/tracing/README.md
index 047354cda1..1f93474fa0 100644
--- a/contrib/tracing/README.md
+++ b/contrib/tracing/README.md
@@ -176,17 +176,12 @@ third acts as a duration threshold in milliseconds. When the `ConnectBlock()`
 function takes longer than the threshold, information about the block, is
 printed. For more details, see the header comment in the script.
 
-By default, `bpftrace` limits strings to 64 bytes due to the limited stack size
-in the kernel VM. Block hashes as zero-terminated hex strings are 65 bytes which
-exceed the string limit. The string size limit can be set to 65 bytes with the
-environment variable `BPFTRACE_STRLEN`.
-
 The following command can be used to benchmark, for example, `ConnectBlock()`
 between height 20000 and 38000 on SigNet while logging all blocks that take
 longer than 25ms to connect.
 
 ```
-$ BPFTRACE_STRLEN=65 bpftrace contrib/tracing/connectblock_benchmark.bt 20000 38000 25
+$ bpftrace contrib/tracing/connectblock_benchmark.bt 20000 38000 25
 ```
 
 In a different terminal, starting Bitcoin Core in SigNet mode and with
diff --git a/contrib/tracing/connectblock_benchmark.bt b/contrib/tracing/connectblock_benchmark.bt
index d268eff7f8..6e7a98ef07 100755
--- a/contrib/tracing/connectblock_benchmark.bt
+++ b/contrib/tracing/connectblock_benchmark.bt
@@ -4,11 +4,8 @@
 
   USAGE:
 
-  BPFTRACE_STRLEN=65 bpftrace contrib/tracing/connectblock_benchmark.bt <start height> <end height> <logging threshold in ms>
+  bpftrace contrib/tracing/connectblock_benchmark.bt <start height> <end height> <logging threshold in ms>
 
-  - The environment variable BPFTRACE_STRLEN needs to be set to 65 chars as
-    strings are limited to 64 chars by default. Hex strings with Bitcoin block
-    hashes are 64 hex chars + 1 null-termination char.
   - <start height> sets the height at which the benchmark should start. Setting
     the start height to 0 starts the benchmark immediately, even before the
     first block is connected.
@@ -23,7 +20,7 @@
 
   EXAMPLES:
 
-  BPFTRACE_STRLEN=65 bpftrace contrib/tracing/connectblock_benchmark.bt 300000 680000 1000
+  bpftrace contrib/tracing/connectblock_benchmark.bt 300000 680000 1000
 
   When run together 'bitcoind -reindex', this benchmarks the time it takes to
   connect the blocks between height 300.000 and 680.000 (inclusive) and prints
@@ -31,7 +28,7 @@
   histogram with block connection times when the benchmark is finished.
 
 
-  BPFTRACE_STRLEN=65 bpftrace contrib/tracing/connectblock_benchmark.bt 0 0 500
+  bpftrace contrib/tracing/connectblock_benchmark.bt 0 0 500
 
   When running together 'bitcoind', all newly connected blocks that
   take longer than 500ms to connect are logged. A histogram with block
@@ -107,14 +104,23 @@ usdt:./src/bitcoind:validation:block_connected /arg1 >= $1 && (arg1 <= $2 || $2
 */
 usdt:./src/bitcoind:validation:block_connected / (uint64) arg5 / 1000> $3 /
 {
-  $hash_str = str(arg0);
+  $hash = arg0;
   $height = (int32) arg1;
   $transactions = (uint64) arg2;
   $inputs = (int32) arg3;
   $sigops = (int64) arg4;
   $duration = (int64) arg5;
 
-  printf("Block %d (%s)  %4d tx  %5d ins  %5d sigops  took %4d ms\n", $height, $hash_str, $transactions, $inputs, $sigops, (uint64) $duration / 1000);
+
+  printf("Block %d (", $height);
+  /* Prints each byte of the block hash as hex in big-endian (the block-explorer format) */
+  $p = $hash + 31;
+  unroll(32) {
+      $b = *(uint8*)$p;
+      printf("%02x", $b);
+      $p -= 1;
+  }
+  printf(")  %4d tx  %5d ins  %5d sigops  took %4d ms\n", $transactions, $inputs, $sigops, (uint64) $duration / 1000);
 }