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https://github.com/isar/libmdbx.git
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mdbx: account loose-pages during spilling and do purge ones if a lack of dirtyroom.
Related to https://github.com/erthink/libmdbx/issues/186 Change-Id: I50c11195ad31615181f8359e123c1ffe2ebcfc30
This commit is contained in:
Leonid Yuriev
parent
17116b9b46
commit
329a2a50e6
156
src/core.c
156
src/core.c
@ -5101,7 +5101,7 @@ static int spill_page(MDBX_txn *txn, struct mdbx_iov_ctx *ctx, MDBX_page *dp,
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static int mdbx_txn_spill(MDBX_txn *const txn, MDBX_cursor *const m0,
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const unsigned need) {
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#ifndef MDBX_DEBUG_SPILLING
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if (likely(txn->tw.dirtyroom >= need))
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if (likely(txn->tw.dirtyroom + txn->tw.loose_count >= need))
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return MDBX_SUCCESS;
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unsigned wanna_spill = need - txn->tw.dirtyroom;
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#else
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@ -5217,7 +5217,7 @@ static int mdbx_txn_spill(MDBX_txn *const txn, MDBX_cursor *const m0,
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}
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/* half of 8-bit radix-sort */
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unsigned radix_counters[256], spillable = 0;
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unsigned radix_counters[256], spillable = 0, spilled = 0;
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memset(&radix_counters, 0, sizeof(radix_counters));
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unsigned const reciprocal = 255 * 256 / (lru_max - lru_min + 1);
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for (unsigned i = 1; i <= dl->length; ++i) {
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@ -5228,74 +5228,75 @@ static int mdbx_txn_spill(MDBX_txn *const txn, MDBX_cursor *const m0,
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}
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}
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unsigned prio2spill = 0, prio2adjacent = 127, amount = radix_counters[0];
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for (unsigned i = 1; i < 256; i++) {
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if (amount < wanna_spill) {
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prio2spill = i;
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prio2adjacent = i + (255 - i) / 2;
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amount += radix_counters[i];
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} else if (amount + amount < spillable + wanna_spill
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/* РАВНОЗНАЧНО: amount - wanna_spill < spillable - amount */) {
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prio2adjacent = i;
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amount += radix_counters[i];
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} else
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break;
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}
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if (likely(spillable > 0)) {
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unsigned prio2spill = 0, prio2adjacent = 127, amount = radix_counters[0];
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for (unsigned i = 1; i < 256; i++) {
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if (amount < wanna_spill) {
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prio2spill = i;
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prio2adjacent = i + (255 - i) / 2;
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amount += radix_counters[i];
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} else if (amount + amount < spillable + wanna_spill
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/* РАВНОЗНАЧНО: amount - wanna_spill < spillable - amount */) {
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prio2adjacent = i;
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amount += radix_counters[i];
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} else
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break;
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}
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unsigned prev_prio = 256, spilled = 0;
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unsigned r, w, prio;
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for (w = 0, r = 1; r <= dl->length && spilled < wanna_spill;
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prev_prio = prio, ++r) {
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prio = spill_prio(txn, r, lru_min, reciprocal);
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MDBX_page *const dp = dl->items[r].ptr;
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if (prio < prio2adjacent) {
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const pgno_t pgno = dl->items[r].pgno;
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const unsigned npages = dpl_npages(dl, r);
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if (prio <= prio2spill) {
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if (prev_prio < prio2adjacent && prev_prio > prio2spill &&
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dpl_endpgno(dl, r - 1) == pgno) {
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mdbx_debug("co-spill %u prev-adjacent page %" PRIaPGNO
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" (lru-dist %d, prio %u)",
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dpl_npages(dl, w), dl->items[r - 1].pgno,
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txn->tw.dirtylru - dl->items[r - 1].lru, prev_prio);
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--w;
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rc = spill_page(txn, &ctx, dl->items[r - 1].ptr,
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dpl_npages(dl, r - 1));
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unsigned prev_prio = 256;
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unsigned r, w, prio;
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for (w = 0, r = 1; r <= dl->length && spilled < wanna_spill;
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prev_prio = prio, ++r) {
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prio = spill_prio(txn, r, lru_min, reciprocal);
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MDBX_page *const dp = dl->items[r].ptr;
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if (prio < prio2adjacent) {
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const pgno_t pgno = dl->items[r].pgno;
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const unsigned npages = dpl_npages(dl, r);
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if (prio <= prio2spill) {
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if (prev_prio < prio2adjacent && prev_prio > prio2spill &&
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dpl_endpgno(dl, r - 1) == pgno) {
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mdbx_debug("co-spill %u prev-adjacent page %" PRIaPGNO
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" (lru-dist %d, prio %u)",
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dpl_npages(dl, w), dl->items[r - 1].pgno,
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txn->tw.dirtylru - dl->items[r - 1].lru, prev_prio);
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--w;
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rc = spill_page(txn, &ctx, dl->items[r - 1].ptr,
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dpl_npages(dl, r - 1));
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if (unlikely(rc != MDBX_SUCCESS))
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break;
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++spilled;
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}
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mdbx_debug("spill %u page %" PRIaPGNO " (lru-dist %d, prio %u)",
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npages, dp->mp_pgno, txn->tw.dirtylru - dl->items[r].lru,
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prio);
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rc = spill_page(txn, &ctx, dp, npages);
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if (unlikely(rc != MDBX_SUCCESS))
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break;
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++spilled;
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continue;
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}
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mdbx_debug("spill %u page %" PRIaPGNO " (lru-dist %d, prio %u)", npages,
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dp->mp_pgno, txn->tw.dirtylru - dl->items[r].lru, prio);
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rc = spill_page(txn, &ctx, dp, npages);
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if (unlikely(rc != MDBX_SUCCESS))
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break;
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++spilled;
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continue;
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}
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if (prev_prio <= prio2spill && dpl_endpgno(dl, r - 1) == pgno) {
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mdbx_debug("co-spill %u next-adjacent page %" PRIaPGNO
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" (lru-dist %d, prio %u)",
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npages, dp->mp_pgno, txn->tw.dirtylru - dl->items[r].lru,
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prio);
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rc = spill_page(txn, &ctx, dp, npages);
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if (unlikely(rc != MDBX_SUCCESS))
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break;
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prio = prev_prio /* to continue co-spilling next adjacent pages */;
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++spilled;
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continue;
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if (prev_prio <= prio2spill && dpl_endpgno(dl, r - 1) == pgno) {
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mdbx_debug("co-spill %u next-adjacent page %" PRIaPGNO
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" (lru-dist %d, prio %u)",
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npages, dp->mp_pgno, txn->tw.dirtylru - dl->items[r].lru,
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prio);
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rc = spill_page(txn, &ctx, dp, npages);
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if (unlikely(rc != MDBX_SUCCESS))
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break;
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prio = prev_prio /* to continue co-spilling next adjacent pages */;
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++spilled;
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continue;
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}
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}
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dl->items[++w] = dl->items[r];
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}
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dl->items[++w] = dl->items[r];
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}
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while (r <= dl->length)
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dl->items[++w] = dl->items[r++];
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mdbx_tassert(txn, r - 1 - w == spilled);
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while (r <= dl->length)
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dl->items[++w] = dl->items[r++];
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mdbx_tassert(txn, r - 1 - w == spilled);
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if (likely(spilled > 0)) {
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dl->sorted = dpl_setlen(dl, w);
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txn->tw.dirtyroom += spilled;
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mdbx_tassert(txn, mdbx_dirtylist_check(txn));
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@ -5315,7 +5316,9 @@ static int mdbx_txn_spill(MDBX_txn *const txn, MDBX_cursor *const m0,
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mdbx_tassert(txn, ctx.iov_items == 0 && rc == MDBX_SUCCESS);
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}
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return likely(txn->tw.dirtyroom > need / 2) ? MDBX_SUCCESS : MDBX_TXN_FULL;
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return likely(txn->tw.loose_count + txn->tw.dirtyroom > need / 2)
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? MDBX_SUCCESS
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: MDBX_TXN_FULL;
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}
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static int mdbx_cursor_spill(MDBX_cursor *mc, const MDBX_val *key,
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@ -5631,16 +5634,35 @@ static __cold pgno_t mdbx_find_largest(MDBX_env *env, pgno_t largest) {
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/* Add a page to the txn's dirty list */
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static int __must_check_result mdbx_page_dirty(MDBX_txn *txn, MDBX_page *mp,
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unsigned npages) {
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int rc;
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mp->mp_txnid = txn->mt_front;
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if (unlikely(txn->tw.dirtyroom == 0)) {
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mdbx_error("Dirtyroom is depleted, DPL length %u",
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txn->tw.dirtylist->length);
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if (!(txn->mt_flags & MDBX_WRITEMAP))
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mdbx_dpage_free(txn->mt_env, mp, npages);
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return MDBX_TXN_FULL;
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if (txn->tw.loose_count) {
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MDBX_page *loose = txn->tw.loose_pages;
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mdbx_debug("purge-and-reclaim loose page %" PRIaPGNO, loose->mp_pgno);
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rc = mdbx_pnl_insert_range(&txn->tw.reclaimed_pglist, loose->mp_pgno, 1);
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if (unlikely(rc != MDBX_SUCCESS))
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goto bailout;
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unsigned di = mdbx_dpl_search(txn, loose->mp_pgno);
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mdbx_tassert(txn, txn->tw.dirtylist->items[di].ptr == loose);
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mdbx_dpl_remove(txn, di);
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txn->tw.loose_pages = loose->mp_next;
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txn->tw.loose_count--;
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txn->tw.dirtyroom++;
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if (!(txn->mt_flags & MDBX_WRITEMAP))
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mdbx_dpage_free(txn->mt_env, loose, 1);
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} else {
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mdbx_error("Dirtyroom is depleted, DPL length %u",
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txn->tw.dirtylist->length);
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if (!(txn->mt_flags & MDBX_WRITEMAP))
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mdbx_dpage_free(txn->mt_env, mp, npages);
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return MDBX_TXN_FULL;
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}
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}
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const int rc = mdbx_dpl_append(txn, mp->mp_pgno, mp, npages);
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rc = mdbx_dpl_append(txn, mp->mp_pgno, mp, npages);
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if (unlikely(rc != MDBX_SUCCESS)) {
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bailout:
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txn->mt_flags |= MDBX_TXN_ERROR;
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return rc;
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}
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