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mdbx: minor refine page_rebalance().

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Change-Id: I066e7a22d62c45f9e80fb4735f55f02ca34d3ee3
This commit is contained in:
Leonid Yuriev 2021-03-22 21:23:50 +03:00
parent 2524a0e749
commit 3c389d17e8
1 changed files with 10 additions and 9 deletions
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19
src/core.c
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@ -3709,7 +3709,7 @@ static int __must_check_result mdbx_node_add_leaf2(MDBX_cursor *mc,
static void mdbx_node_del(MDBX_cursor *mc, size_t ksize);
static void mdbx_node_shrink(MDBX_page *mp, unsigned indx);
static int __must_check_result mdbx_node_move(MDBX_cursor *csrc,
MDBX_cursor *cdst, int fromleft);
MDBX_cursor *cdst, bool fromleft);
static int __must_check_result mdbx_node_read(MDBX_cursor *mc, MDBX_node *leaf,
MDBX_val *data,
const txnid_t pp_txnid);
@ -15714,7 +15714,7 @@ static int mdbx_update_key(MDBX_cursor *mc, const MDBX_val *key) {
}
/* Move a node from csrc to cdst. */
static int mdbx_node_move(MDBX_cursor *csrc, MDBX_cursor *cdst, int fromleft) {
static int mdbx_node_move(MDBX_cursor *csrc, MDBX_cursor *cdst, bool fromleft) {
int rc;
DKBUF;
@ -16451,6 +16451,7 @@ static int mdbx_rebalance(MDBX_cursor *mc) {
return rc;
mdbx_cassert(mc, PAGETYPE(right) == PAGETYPE(mc->mc_pg[mc->mc_top]));
}
mdbx_cassert(mc, left || right);
const unsigned ki_top = mc->mc_ki[mc->mc_top];
const unsigned ki_pre_top = mn.mc_ki[pre_top];
@ -16458,15 +16459,17 @@ static int mdbx_rebalance(MDBX_cursor *mc) {
const unsigned left_room = left ? page_room(left) : 0;
const unsigned right_room = right ? page_room(right) : 0;
const unsigned left_nkeys = left ? page_numkeys(left) : 0;
const unsigned right_nkeys = right ? page_numkeys(right) : 0;
retry:
if (left_room > room_threshold && left_room >= right_room) {
/* try merge with left */
mdbx_cassert(mc, page_numkeys(left) >= minkeys);
mdbx_cassert(mc, left_nkeys >= minkeys);
mn.mc_pg[mn.mc_top] = left;
mn.mc_ki[mn.mc_top - 1] = (indx_t)(ki_pre_top - 1);
mn.mc_ki[mn.mc_top] = (indx_t)(page_numkeys(left) - 1);
mn.mc_ki[mn.mc_top] = (indx_t)(left_nkeys - 1);
mc->mc_ki[mc->mc_top] = 0;
const unsigned new_ki = ki_top + page_numkeys(left);
const unsigned new_ki = ki_top + left_nkeys;
mn.mc_ki[mn.mc_top] += mc->mc_ki[mn.mc_top] + 1;
/* We want mdbx_rebalance to find mn when doing fixups */
WITH_CURSOR_TRACKING(mn, rc = mdbx_page_merge(mc, &mn));
@ -16479,7 +16482,7 @@ retry:
}
if (right_room > room_threshold) {
/* try merge with right */
mdbx_cassert(mc, page_numkeys(right) >= minkeys);
mdbx_cassert(mc, right_nkeys >= minkeys);
mn.mc_pg[mn.mc_top] = right;
mn.mc_ki[mn.mc_top - 1] = (indx_t)(ki_pre_top + 1);
mn.mc_ki[mn.mc_top] = 0;
@ -16492,14 +16495,12 @@ retry:
}
}
const unsigned left_nkeys = left ? page_numkeys(left) : 0;
const unsigned right_nkeys = right ? page_numkeys(right) : 0;
if (left_nkeys > minkeys &&
(right_nkeys <= left_nkeys || right_room >= left_room)) {
/* try move from left */
mn.mc_pg[mn.mc_top] = left;
mn.mc_ki[mn.mc_top - 1] = (indx_t)(ki_pre_top - 1);
mn.mc_ki[mn.mc_top] = (indx_t)(page_numkeys(left) - 1);
mn.mc_ki[mn.mc_top] = (indx_t)(left_nkeys - 1);
mc->mc_ki[mc->mc_top] = 0;
WITH_CURSOR_TRACKING(mn, rc = mdbx_node_move(&mn, mc, true));
if (likely(rc != MDBX_RESULT_TRUE)) {