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mdbx: two-phase txnid to avoid bottom-top DMA updates.

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This commit is contained in:
Leo Yuriev
2017-05-26 20:00:52 +03:00
parent dd33bea1d8
commit 76f459c08e
2 changed files with 151 additions and 71 deletions
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6
src/bits.h
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@@ -252,6 +252,9 @@ typedef struct MDBX_meta {
uint32_t mm_magic;
/* Version number of this file. Must be set to MDBX_DATA_VERSION. */
uint32_t mm_version;
/* txnid that committed this page, */
volatile txnid_t mm_txnid_top;
size_t mm_mapsize; /* size of mmap region */
MDBX_db mm_dbs[CORE_DBS]; /* first is free space, 2nd is main db */
/* The size of pages used in this DB */
@@ -271,7 +274,8 @@ typedef struct MDBX_meta {
#define META_IS_WEAK(meta) SIGN_IS_WEAK((meta)->mm_datasync_sign)
#define META_IS_STEADY(meta) SIGN_IS_STEADY((meta)->mm_datasync_sign)
volatile txnid_t mm_txnid; /* txnid that committed this page */
/* txnid that committed this page */
volatile txnid_t mm_txnid_bottom;
} MDBX_meta;
/* Common header for all page types. The page type depends on mp_flags.