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mdbx: adds pre- and post- gaps to dirty page list to avoid some comparisons and conditional branches.

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More for https://github.com/erthink/libmdbx/issues/132

Change-Id: I6562c5ff6c559341bb7bb64222b126f06cc13427
This commit is contained in:
Leonid Yuriev
2021-01-30 21:02:04 +03:00
parent b57a338546
commit 077989bfed
3 changed files with 80 additions and 47 deletions
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5
src/internals.h
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@@ -380,8 +380,8 @@ typedef struct MDBX_meta {
* in the snapshot: Either used by a database or listed in a GC record. */
typedef struct MDBX_page {
union {
struct MDBX_page *mp_next; /* for in-memory list of freed pages */
uint64_t mp_txnid; /* txnid that committed this page */
struct MDBX_page *mp_next; /* for in-memory list of freed pages */
};
uint16_t mp_leaf2_ksize; /* key size if this is a LEAF2 page */
#define P_BRANCH 0x01 /* branch page */
@@ -391,15 +391,16 @@ typedef struct MDBX_page {
#define P_DIRTY 0x10 /* dirty page, also set for P_SUBP pages */
#define P_LEAF2 0x20 /* for MDBX_DUPFIXED records */
#define P_SUBP 0x40 /* for MDBX_DUPSORT sub-pages */
#define P_BAD 0x80 /* explicit flag for invalid/bad page */
#define P_LOOSE 0x4000 /* page was dirtied then freed, can be reused */
#define P_KEEP 0x8000 /* leave this page alone during spill */
uint16_t mp_flags;
union {
uint32_t mp_pages; /* number of overflow pages */
__anonymous_struct_extension__ struct {
indx_t mp_lower; /* lower bound of free space */
indx_t mp_upper; /* upper bound of free space */
};
uint32_t mp_pages; /* number of overflow pages */
};
pgno_t mp_pgno; /* page number */