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mdbx-tools: rework mdbx_reader_list() & mdbx_stat.

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Change-Id: I0524cad93ca439e74eba9486cbcbeacf4253dd84
This commit is contained in:
Leonid Yuriev
2019-09-19 00:54:03 +03:00
parent 2f2df1ee76
commit 7c39c16829
3 changed files with 119 additions and 49 deletions
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80
src/elements/core.c
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@@ -13195,46 +13195,66 @@ int mdbx_set_dupsort(MDBX_txn *txn, MDBX_dbi dbi, MDBX_cmp_func *cmp) {
return MDBX_SUCCESS;
}
int __cold mdbx_reader_list(MDBX_env *env, MDBX_msg_func *func, void *ctx) {
char buf[64];
int rc = 0, first = 1;
int __cold mdbx_reader_list(MDBX_env *env, MDBX_reader_list_func *func,
void *ctx) {
if (unlikely(!env || !func))
return (MDBX_EINVAL > 0) ? -MDBX_EINVAL : MDBX_EINVAL;
return MDBX_EINVAL;
if (unlikely(env->me_signature != MDBX_ME_SIGNATURE))
return MDBX_EBADSIGN;
const MDBX_lockinfo *const lck = env->me_lck;
if (likely(lck)) {
const unsigned snap_nreaders = lck->mti_numreaders;
int rc = MDBX_RESULT_TRUE;
int serial = 0;
if (likely(env->me_lck)) {
const unsigned snap_nreaders = env->me_lck->mti_numreaders;
for (unsigned i = 0; i < snap_nreaders; i++) {
if (lck->mti_readers[i].mr_pid) {
const txnid_t txnid = lck->mti_readers[i].mr_txnid;
if (txnid == ~(txnid_t)0)
snprintf(buf, sizeof(buf), "%10" PRIuPTR " %" PRIxPTR " -\n",
(uintptr_t)lck->mti_readers[i].mr_pid,
(uintptr_t)lck->mti_readers[i].mr_tid);
else
snprintf(buf, sizeof(buf),
"%10" PRIuPTR " %" PRIxPTR " %" PRIaTXN "\n",
(uintptr_t)lck->mti_readers[i].mr_pid,
(uintptr_t)lck->mti_readers[i].mr_tid, txnid);
const MDBX_reader *r = env->me_lck->mti_readers + i;
retry_reader:;
const mdbx_pid_t pid = r->mr_pid;
if (!pid)
continue;
txnid_t txnid = r->mr_txnid;
const mdbx_tid_t tid = r->mr_tid;
const pgno_t pages_used = r->mr_snapshot_pages_used;
const uint64_t reader_pages_retired = r->mr_snapshot_pages_retired;
mdbx_compiler_barrier();
if (unlikely(pid != r->mr_pid || txnid != r->mr_txnid ||
tid != r->mr_tid ||
pages_used != r->mr_snapshot_pages_used ||
reader_pages_retired != r->mr_snapshot_pages_retired))
goto retry_reader;
if (first) {
first = 0;
rc = func(" pid thread txnid\n", ctx);
if (rc < 0)
break;
}
rc = func(buf, ctx);
if (rc < 0)
break;
mdbx_assert(env, txnid > 0);
if (txnid == ~(txnid_t)0)
txnid = 0;
size_t bytes_used = 0;
size_t bytes_retained = 0;
uint64_t lag = 0;
if (txnid) {
retry_header:;
const MDBX_meta *const recent_meta = mdbx_meta_head(env);
const uint64_t head_pages_retired = recent_meta->mm_pages_retired;
const txnid_t head_txnid = mdbx_meta_txnid_fluid(env, recent_meta);
mdbx_compiler_barrier();
if (unlikely(recent_meta != mdbx_meta_head(env) ||
head_pages_retired != recent_meta->mm_pages_retired) ||
head_txnid != mdbx_meta_txnid_fluid(env, recent_meta))
goto retry_header;
lag = head_txnid - txnid;
bytes_used = pgno2bytes(env, pages_used);
bytes_retained = (head_pages_retired > reader_pages_retired)
? pgno2bytes(env, (pgno_t)(head_pages_retired -
reader_pages_retired))
: 0;
}
rc = func(ctx, ++serial, i, pid, tid, txnid, lag, bytes_used,
bytes_retained);
if (unlikely(rc != MDBX_SUCCESS))
break;
}
}
if (first)
rc = func("(no active readers)\n", ctx);
return rc;
}