ISAR/libmdbx
3
0
Fork 0
mirror of https://github.com/isar/libmdbx.git synced 2024-12-30 02:34:13 +08:00
Code Issues Packages Projects Releases Wiki Activity

mdbx: refine comment for mdbx_update_gc().

Browse Source
This commit is contained in:
Leonid Yuriev 2022-01-30 11:46:43 +03:00
parent dbba0fe18e
commit bd51e181fb
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/core.c
View File

@ -8771,9 +8771,15 @@ static __inline void clean_reserved_gc_pnl(MDBX_env *env, MDBX_val pnl) {
memset(pnl.iov_base, 0, pnl.iov_len);
}
/* Cleanup reclaimed GC records, than save the retired-list as of this
* transaction to GC (aka freeDB). This recursive changes the reclaimed-list
* loose-list and retired-list. Keep trying until it stabilizes. */
/* Cleanups reclaimed GC (aka freeDB) records, saves the retired-list (aka
* freelist) of current transaction to GC, puts back into GC leftover of the
* reclaimed pages with chunking. This recursive changes the reclaimed-list,
* loose-list and retired-list. Keep trying until it stabilizes.
*
* NOTE: This code is a consequence of many iterations of adding crutches (aka
* "checks and balances") to partially bypass the fundamental design problems
* inherited from LMDB. So do not try to understand it completely in order to
* avoid your madness. */
static int mdbx_update_gc(MDBX_txn *txn) {
/* txn->tw.reclaimed_pglist[] can grow and shrink during this call.
* txn->tw.last_reclaimed and txn->tw.retired_pages[] can only grow.