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mdbx: rework (NO)READAHEAD handling.

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Resolves https://github.com/erthink/libmdbx/issues/164

---

NOTE: Seems there is a bug in the Mach/Darwin/OSX kernel,
because MADV_WILLNEED with offset != 0 may cause SIGBUS
on following access to the hinted region.

19.6.0 Darwin Kernel Version 19.6.0: Tue Jan 12 22:13:05 PST 2021; root:xnu-6153.141.16~1/RELEASE_X86_64 x86_64

Change-Id: I11ebbf2bd35e3dba9d078be16cb5678aecf8329c
This commit is contained in:
Leonid Yuriev
2021-04-17 00:13:51 +03:00
parent 28affe79d8
commit 3e0fad1cf6
3 changed files with 130 additions and 66 deletions
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7
src/internals.h
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@@ -536,7 +536,7 @@ typedef struct MDBX_lockinfo {
* Zero means timed auto-sync is disabled. */
MDBX_atomic_uint64_t mti_autosync_period;
/* Marker to distinguish uniqueness of DB/CLK.*/
/* Marker to distinguish uniqueness of DB/CLK. */
MDBX_atomic_uint64_t mti_bait_uniqueness;
alignas(MDBX_CACHELINE_SIZE) /* cacheline ---------------------------------*/
@@ -562,6 +562,9 @@ typedef struct MDBX_lockinfo {
/* Timestamp of the last readers check. */
MDBX_atomic_uint64_t mti_reader_check_timestamp;
/* Shared anchor for tracking readahead edge and enabled/disabled status. */
pgno_t mti_readahead_anchor;
alignas(MDBX_CACHELINE_SIZE) /* cacheline ---------------------------------*/
/* Readeaders registration lock. */
@@ -975,6 +978,7 @@ struct MDBX_env {
atomic_pgno_t *me_unsynced_pages;
atomic_pgno_t *me_autosync_threshold;
atomic_pgno_t *me_discarded_tail;
pgno_t *me_readahead_anchor;
MDBX_atomic_uint32_t *me_meta_sync_txnid;
MDBX_hsr_func *me_hsr_callback; /* Callback for kicking laggard readers */
unsigned me_dp_reserve_len;
@@ -998,6 +1002,7 @@ struct MDBX_env {
atomic_pgno_t autosync_pending;
atomic_pgno_t autosync_threshold;
atomic_pgno_t discarded_tail;
pgno_t readahead_anchor;
MDBX_atomic_uint32_t meta_sync_txnid;
} me_lckless_stub;
#if MDBX_DEBUG