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remove double std::map lookup

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Eugene Kosov 2020-05-05 13:24:58 +03:00 committed by Marko Mäkelä
parent 937dfb74cb
commit 36b8ac2c0d
1 changed files with 7 additions and 5 deletions
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12
storage/innobase/trx/trx0purge.cc
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@ -43,6 +43,8 @@ Created 3/26/1996 Heikki Tuuri
#include "trx0trx.h" #include "trx0trx.h"
#include <mysql/service_wsrep.h> #include <mysql/service_wsrep.h>
#include <unordered_map>
/** Maximum allowable purge history length. <=0 means 'infinite'. */ /** Maximum allowable purge history length. <=0 means 'infinite'. */
ulong srv_max_purge_lag = 0; ulong srv_max_purge_lag = 0;
@ -1136,7 +1138,7 @@ trx_purge_attach_undo_recs(ulint n_purge_threads)
i = 0; i = 0;
const ulint batch_size = srv_purge_batch_size; const ulint batch_size = srv_purge_batch_size;
std::map<table_id_t, purge_node_t*> table_id_map; std::unordered_map<table_id_t, purge_node_t*> table_id_map;
mem_heap_empty(purge_sys.heap); mem_heap_empty(purge_sys.heap);
while (UNIV_LIKELY(srv_undo_sources) || !srv_fast_shutdown) { while (UNIV_LIKELY(srv_undo_sources) || !srv_fast_shutdown) {
@ -1170,10 +1172,10 @@ trx_purge_attach_undo_recs(ulint n_purge_threads)
table_id_t table_id = trx_undo_rec_get_table_id( table_id_t table_id = trx_undo_rec_get_table_id(
purge_rec.undo_rec); purge_rec.undo_rec);
auto it = table_id_map.find(table_id); purge_node_t *& table_node = table_id_map[table_id];
if (it != table_id_map.end()) { if (table_node) {
node = it->second; node = table_node;
} else { } else {
thr = UT_LIST_GET_NEXT(thrs, thr); thr = UT_LIST_GET_NEXT(thrs, thr);
@ -1183,7 +1185,7 @@ trx_purge_attach_undo_recs(ulint n_purge_threads)
} }
ut_a(thr != NULL); ut_a(thr != NULL);
table_id_map.insert({table_id, node}); table_node = node;
} }
node->undo_recs.push(purge_rec); node->undo_recs.push(purge_rec);