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mdbx: preparation for LRU-spilling.

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Initial for https://github.com/erthink/libmdbx/issues/186

Change-Id: I9a6d60cc142ff7490e2a23defe9654d7e3337edc
This commit is contained in:
Leonid Yuriev
2021-04-23 19:03:07 +03:00
parent b21ad733ea
commit d1fea74d0e
3 changed files with 132 additions and 104 deletions
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11
src/internals.h
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@@ -824,8 +824,15 @@ typedef txnid_t *MDBX_TXL;
/* An Dirty-Page list item is an pgno/pointer pair. */
typedef struct MDBX_dp {
pgno_t pgno;
MDBX_page *ptr;
pgno_t pgno;
union {
unsigned extra;
__anonymous_struct_extension__ struct {
unsigned multi : 1;
unsigned lru : 31;
};
};
} MDBX_dp;
/* An DPL (dirty-page list) is a sorted array of MDBX_DPs. */
@@ -976,6 +983,8 @@ struct MDBX_txn {
* dirty/spilled pages. Thus commit(nested txn) has room to merge
* dirtylist into mt_parent after freeing hidden mt_parent pages. */
unsigned dirtyroom;
/* a sequence to spilling dirty page with LRU policy */
unsigned dirtylru;
/* For write txns: Modified pages. Sorted when not MDBX_WRITEMAP. */
MDBX_dpl *dirtylist;
/* The list of reclaimed txns from GC */