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merge bitcoin#22902: utxocache tracepoints

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Kittywhiskers Van Gogh 2021-09-03 18:46:13 +05:30
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59
contrib/tracing/README.md
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@ -234,3 +234,62 @@ Histogram of block connection times in milliseconds (ms).
[16, 32) 9 | |
[32, 64) 4 | |
```
### log_utxocache_flush.py
A BCC Python script to log the cache and index flushes. Based on the
`utxocache:flush` tracepoint.
```bash
$ python3 contrib/tracing/log_utxocache_flush.py ./src/dashd
```
```
Logging utxocache flushes. Ctrl-C to end...
Duration (µs) Mode Coins Count Memory Usage Prune Full Flush
0 PERIODIC 28484 3929.87 kB False False
1 PERIODIC 28485 3930.00 kB False False
0 PERIODIC 28489 3930.51 kB False False
1 PERIODIC 28490 3930.64 kB False False
0 PERIODIC 28491 3930.77 kB False False
0 PERIODIC 28491 3930.77 kB False False
0 PERIODIC 28496 3931.41 kB False False
1 PERIODIC 28496 3931.41 kB False False
0 PERIODIC 28497 3931.54 kB False False
1 PERIODIC 28497 3931.54 kB False False
1 PERIODIC 28499 3931.79 kB False False
.
.
.
53788 ALWAYS 30076 4136.27 kB False False
7463 ALWAYS 0 245.84 kB False False
```
### log_utxos.bt
A `bpftrace` script to log information about the coins that are added, spent, or
uncached from the UTXO set. Based on the `utxocache:add`, `utxocache:spend` and
`utxocache:uncache` tracepoints.
```bash
$ bpftrace contrib/tracing/log_utxos.bt
```
It should produce an output similar to the following.
```bash
Attaching 4 probes...
OP Outpoint Value Height Coinbase
Added 6ba9ad857e1ef2eb2a2c94f06813c414c7ab273e3d6bd7ad64e000315a887e7c:1 10000 2094512 No
Spent fa7dc4db56637a151f6649d8f26732956d1c5424c82aae400a83d02b2cc2c87b:0 182264897 2094512 No
Added eeb2f099b1af6a2a12e6ddd2eeb16fc5968582241d7f08ba202d28b60ac264c7:0 10000 2094512 No
Added eeb2f099b1af6a2a12e6ddd2eeb16fc5968582241d7f08ba202d28b60ac264c7:1 182254756 2094512 No
Added a0c7f4ec9cccef2d89672a624a4e6c8237a17572efdd4679eea9e9ee70d2db04:0 10072679 2094513 Yes
Spent 25e0df5cc1aeb1b78e6056bf403e5e8b7e41f138060ca0a50a50134df0549a5e:2 540 2094508 No
Spent 42f383c04e09c26a2378272ec33aa0c1bf4883ca5ab739e8b7e06be5a5787d61:1 3848399 2007724 No
Added f85e3b4b89270863a389395cc9a4123e417ab19384cef96533c6649abd6b0561:0 3788399 2094513 No
Added f85e3b4b89270863a389395cc9a4123e417ab19384cef96533c6649abd6b0561:2 540 2094513 No
Spent a05880b8c77971ed0b9f73062c7c4cdb0ff3856ab14cbf8bc481ed571cd34b83:1 5591281046 2094511 No
Added eb689865f7d957938978d6207918748f74e6aa074f47874724327089445b0960:0 5589696005 2094513 No
Added eb689865f7d957938978d6207918748f74e6aa074f47874724327089445b0960:1 1565556 2094513 No
```

107
contrib/tracing/log_utxocache_flush.py Executable file
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@ -0,0 +1,107 @@
#!/usr/bin/env python3
import sys
import ctypes
from bcc import BPF, USDT
"""Example logging Dash Core utxo set cache flushes utilizing
the utxocache:flush tracepoint."""
# USAGE: ./contrib/tracing/log_utxocache_flush.py path/to/dashd
# BCC: The C program to be compiled to an eBPF program (by BCC) and loaded into
# a sandboxed Linux kernel VM.
program = """
# include <uapi/linux/ptrace.h>
struct data_t
{
u64 duration;
u32 mode;
u64 coins_count;
u64 coins_mem_usage;
bool is_flush_prune;
bool is_full_flush;
};
// BPF perf buffer to push the data to user space.
BPF_PERF_OUTPUT(flush);
int trace_flush(struct pt_regs *ctx) {
struct data_t data = {};
bpf_usdt_readarg(1, ctx, &data.duration);
bpf_usdt_readarg(2, ctx, &data.mode);
bpf_usdt_readarg(3, ctx, &data.coins_count);
bpf_usdt_readarg(4, ctx, &data.coins_mem_usage);
bpf_usdt_readarg(5, ctx, &data.is_flush_prune);
bpf_usdt_readarg(5, ctx, &data.is_full_flush);
flush.perf_submit(ctx, &data, sizeof(data));
return 0;
}
"""
FLUSH_MODES = [
'NONE',
'IF_NEEDED',
'PERIODIC',
'ALWAYS'
]
class Data(ctypes.Structure):
# define output data structure corresponding to struct data_t
_fields_ = [
("duration", ctypes.c_uint64),
("mode", ctypes.c_uint32),
("coins_count", ctypes.c_uint64),
("coins_mem_usage", ctypes.c_uint64),
("is_flush_prune", ctypes.c_bool),
("is_full_flush", ctypes.c_bool)
]
def print_event(event):
print("%-15d %-10s %-15d %-15s %-8s %-8s" % (
event.duration,
FLUSH_MODES[event.mode],
event.coins_count,
"%.2f kB" % (event.coins_mem_usage/1000),
event.is_flush_prune,
event.is_full_flush
))
def main(bitcoind_path):
bitcoind_with_usdts = USDT(path=str(bitcoind_path))
# attaching the trace functions defined in the BPF program
# to the tracepoints
bitcoind_with_usdts.enable_probe(
probe="flush", fn_name="trace_flush")
b = BPF(text=program, usdt_contexts=[bitcoind_with_usdts])
def handle_flush(_, data, size):
""" Coins Flush handler.
Called each time coin caches and indexes are flushed."""
event = ctypes.cast(data, ctypes.POINTER(Data)).contents
print_event(event)
b["flush"].open_perf_buffer(handle_flush)
print("Logging utxocache flushes. Ctrl-C to end...")
print("%-15s %-10s %-15s %-15s %-8s %-8s" % ("Duration (µs)", "Mode",
"Coins Count", "Memory Usage",
"Prune", "Full Flush"))
while True:
try:
b.perf_buffer_poll()
except KeyboardInterrupt:
exit(0)
if __name__ == "__main__":
if len(sys.argv) < 2:
print("USAGE: ", sys.argv[0], "path/to/dashd")
exit(1)
path = sys.argv[1]
main(path)

86
contrib/tracing/log_utxos.bt Executable file
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@ -0,0 +1,86 @@
#!/usr/bin/env bpftrace
/*
USAGE:
bpftrace contrib/tracing/log_utxos.bt
This script requires a 'dashd' binary compiled with eBPF support and the
'utxochache' tracepoints. By default, it's assumed that 'dashd' is
located in './src/dashd'. This can be modified in the script below.
NOTE: requires bpftrace v0.12.0 or above.
*/
BEGIN
{
printf("%-7s %-71s %16s %7s %8s\n",
"OP", "Outpoint", "Value", "Height", "Coinbase");
}
/*
Attaches to the 'utxocache:add' tracepoint and prints additions to the UTXO set cache.
*/
usdt:./src/dashd:utxocache:add
{
$txid = arg0;
$index = (uint32)arg1;
$height = (uint32)arg2;
$value = (int64)arg3;
$isCoinbase = arg4;
printf("Added ");
$p = $txid + 31;
unroll(32) {
$b = *(uint8*)$p;
printf("%02x", $b);
$p-=1;
}
printf(":%-6d %16ld %7d %s\n", $index, $value, $height, ($isCoinbase ? "Yes" : "No" ));
}
/*
Attaches to the 'utxocache:spent' tracepoint and prints spents from the UTXO set cache.
*/
usdt:./src/dashd:utxocache:spent
{
$txid = arg0;
$index = (uint32)arg1;
$height = (uint32)arg2;
$value = (int64)arg3;
$isCoinbase = arg4;
printf("Spent ");
$p = $txid + 31;
unroll(32) {
$b = *(uint8*)$p;
printf("%02x", $b);
$p-=1;
}
printf(":%-6d %16ld %7d %s\n", $index, $value, $height, ($isCoinbase ? "Yes" : "No" ));
}
/*
Attaches to the 'utxocache:uncache' tracepoint and uncache UTXOs from the UTXO set cache.
*/
usdt:./src/dashd:utxocache:uncache
{
$txid = arg0;
$index = (uint32)arg1;
$height = (uint32)arg2;
$value = (int64)arg3;
$isCoinbase = arg4;
printf("Uncache ");
$p = $txid + 31;
unroll(32) {
$b = *(uint8*)$p;
printf("%02x", $b);
$p-=1;
}
printf(":%-6d %16ld %7d %s\n", $index, $value, $height, ($isCoinbase ? "Yes" : "No" ));
}

49
doc/tracing.md
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@ -108,6 +108,55 @@ Arguments passed:
5. SigOps in the Block (excluding coinbase SigOps) `uint64`
6. Time it took to connect the Block in microseconds (µs) as `uint64`
### Context `utxocache`
#### Tracepoint `utxocache:flush`
Is called *after* the caches and indexes are flushed depending on the mode
`CChainState::FlushStateToDisk` is called with.
Arguments passed:
1. Duration in microseconds as `int64`
2. Flush state mode as `uint32`. It's an enumerator class with values `0`
(`NONE`), `1` (`IF_NEEDED`), `2` (`PERIODIC`), `3` (`ALWAYS`)
3. Number of coins flushed as `uint64`
4. Memory usage in bytes as `uint64`
5. If the flush was pruned as `bool`
6. If it was full flush as `bool`
#### Tracepoint `utxocache:add`
It is called when a new coin is added to the UTXO cache.
Arguments passed:
1. Transaction ID (hash) as `pointer to unsigned chars` (i.e. 32 bytes in little-endian)
2. Output index as `uint32`
3. Block height the coin was added to the UTXO-set as `uint32`
4. Value of the coin as `int64`
5. If the coin is a coinbase as `bool`
#### Tracepoint `utxocache:spent`
It is called when a coin is spent from the UTXO cache.
Arguments passed:
1. Transaction ID (hash) as `pointer to unsigned chars` (i.e. 32 bytes in little-endian)
2. Output index as `uint32`
3. Block height the coin was spent, as `uint32`
4. Value of the coin as `int64`
5. If the coin is a coinbase as `bool`
#### Tracepoint `utxocache:uncache`
It is called when the UTXO with the given outpoint is removed from the cache.
Arguments passed:
1. Transaction ID (hash) as `pointer to unsigned chars` (i.e. 32 bytes in little-endian)
2. Output index as `uint32`
3. Block height the coin was uncached, as `uint32`
4. Value of the coin as `int64`
. If the coin is a coinbase as `bool`
## Adding tracepoints to Dash Core
To add a new tracepoint, `#include <util/trace.h>` in the compilation unit where

19
src/coins.cpp
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@ -7,6 +7,7 @@
#include <consensus/consensus.h>
#include <logging.h>
#include <random.h>
#include <util/trace.h>
#include <version.h>
bool CCoinsView::GetCoin(const COutPoint &outpoint, Coin &coin) const { return false; }
@ -98,6 +99,12 @@ void CCoinsViewCache::AddCoin(const COutPoint &outpoint, Coin&& coin, bool possi
it->second.coin = std::move(coin);
it->second.flags |= CCoinsCacheEntry::DIRTY | (fresh ? CCoinsCacheEntry::FRESH : 0);
cachedCoinsUsage += it->second.coin.DynamicMemoryUsage();
TRACE5(utxocache, add,
outpoint.hash.data(),
(uint32_t)outpoint.n,
(uint32_t)coin.nHeight,
(int64_t)coin.out.nValue,
(bool)coin.IsCoinBase());
}
void CCoinsViewCache::EmplaceCoinInternalDANGER(COutPoint&& outpoint, Coin&& coin) {
@ -123,6 +130,12 @@ bool CCoinsViewCache::SpendCoin(const COutPoint &outpoint, Coin* moveout) {
CCoinsMap::iterator it = FetchCoin(outpoint);
if (it == cacheCoins.end()) return false;
cachedCoinsUsage -= it->second.coin.DynamicMemoryUsage();
TRACE5(utxocache, spent,
outpoint.hash.data(),
(uint32_t)outpoint.n,
(uint32_t)it->second.coin.nHeight,
(int64_t)it->second.coin.out.nValue,
(bool)it->second.coin.IsCoinBase());
if (moveout) {
*moveout = std::move(it->second.coin);
}
@ -273,6 +286,12 @@ void CCoinsViewCache::Uncache(const COutPoint& hash)
CCoinsMap::iterator it = cacheCoins.find(hash);
if (it != cacheCoins.end() && it->second.flags == 0) {
cachedCoinsUsage -= it->second.coin.DynamicMemoryUsage();
TRACE5(utxocache, uncache,
hash.hash.data(),
(uint32_t)hash.n,
(uint32_t)it->second.coin.nHeight,
(int64_t)it->second.coin.out.nValue,
(bool)it->second.coin.IsCoinBase());
cacheCoins.erase(it);
}
}

7
src/validation.cpp
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@ -2472,6 +2472,13 @@ bool CChainState::FlushStateToDisk(
nLastFlush = nNow;
full_flush_completed = true;
}
TRACE6(utxocache, flush,
(int64_t)(GetTimeMicros() - nNow.count()), // in microseconds (µs)
(u_int32_t)mode,
(u_int64_t)coins_count,
(u_int64_t)coins_mem_usage,
(bool)fFlushForPrune,
(bool)fDoFullFlush);
}
if (full_flush_completed) {
// Update best block in wallet (so we can detect restored wallets).