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mdbx: growth/shrink datafile with alignment.

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Change-Id: I46deb885654d2bb1d164009159c9364567ab88a9
This commit is contained in:
Leo Yuriev 2017-07-26 10:19:05 +03:00
parent 4f06a38a50
commit 1dab822324
2 changed files with 34 additions and 28 deletions
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8
src/bits.h
View File

@ -1200,3 +1200,11 @@ static __inline pgno_t pgno_add(pgno_t base, pgno_t augend) {
assert(base <= MAX_PAGENO);
return (augend < MAX_PAGENO - base) ? base + augend : MAX_PAGENO;
}
static __inline size_t pgno_align2os_bytes(const MDBX_env *env, pgno_t pgno) {
return mdbx_roundup2(pgno2bytes(env, pgno), env->me_os_psize);
}
static __inline pgno_t pgno_align2os_pgno(const MDBX_env *env, pgno_t pgno) {
return bytes2pgno(env, pgno_align2os_bytes(env, pgno));
}

54
src/mdbx.c
View File

@ -1571,10 +1571,8 @@ static int mdbx_mapresize(MDBX_env *env, const pgno_t size_pgno,
void *const prev_mapaddr = env->me_map;
#endif
const size_t limit_bytes =
mdbx_roundup2(pgno2bytes(env, limit_pgno), env->me_os_psize);
const size_t size_bytes =
mdbx_roundup2(pgno2bytes(env, size_pgno), env->me_os_psize);
const size_t limit_bytes = pgno_align2os_bytes(env, limit_pgno);
const size_t size_bytes = pgno_align2os_bytes(env, size_pgno);
mdbx_info("resize datafile/mapping: "
"present %" PRIuPTR " -> %" PRIuPTR ", "
@ -1914,21 +1912,16 @@ static int mdbx_page_alloc(MDBX_cursor *mc, unsigned num, MDBX_page **mp,
if (rc == MDBX_MAP_FULL && next < head->mm_geo.upper) {
mdbx_assert(env, next > txn->mt_end_pgno);
pgno_t growth_pgno = bytes2pgno(
env, mdbx_roundup2(pgno2bytes(env, pgno_add(txn->mt_next_pgno,
head->mm_geo.grow)),
env->me_os_psize));
while (next >= growth_pgno)
growth_pgno = bytes2pgno(
env, mdbx_roundup2(
pgno2bytes(env, pgno_add(growth_pgno, head->mm_geo.grow)),
env->me_os_psize));
if (growth_pgno > head->mm_geo.upper)
growth_pgno = head->mm_geo.upper;
pgno_t aligned = pgno_align2os_pgno(
env, pgno_add(next, head->mm_geo.grow - next % head->mm_geo.grow));
if (aligned > head->mm_geo.upper)
aligned = head->mm_geo.upper;
mdbx_assert(env, aligned > txn->mt_end_pgno);
mdbx_info("try growth datafile to %" PRIaPGNO " pages (+%" PRIaPGNO ")",
growth_pgno, growth_pgno - txn->mt_end_pgno);
rc = mdbx_mapresize(env, growth_pgno, head->mm_geo.upper);
aligned, aligned - txn->mt_end_pgno);
rc = mdbx_mapresize(env, aligned, head->mm_geo.upper);
if (rc == MDBX_SUCCESS) {
mdbx_tassert(env->me_txn, txn->mt_end_pgno >= next);
if (!mp)
@ -1938,7 +1931,7 @@ static int mdbx_page_alloc(MDBX_cursor *mc, unsigned num, MDBX_page **mp,
mdbx_warning("unable growth datafile to %" PRIaPGNO "pages (+%" PRIaPGNO
"), errcode %d",
growth_pgno, growth_pgno - txn->mt_end_pgno, rc);
aligned, aligned - txn->mt_end_pgno, rc);
}
fail:
@ -3913,15 +3906,18 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
/* Windows is unable shrinking a mapped file */
#else
/* LY: check conditions to shrink datafile */
pgno_t shrink_pgno_delta = 0;
if ((flags & MDBX_SHRINK_ALLOWED) &&
pending->mm_geo.next < head->mm_geo.next) {
const pgno_t shrink_pgno =
pending->mm_geo.next /* + pending->mm_geo.grow */;
if (pending->mm_geo.now > shrink_pgno && pending->mm_geo.shrink &&
unlikely(pending->mm_geo.now - pending->mm_geo.shrink >= shrink_pgno)) {
shrink_pgno_delta = pending->mm_geo.now - shrink_pgno;
pending->mm_geo.now = shrink_pgno;
pgno_t shrink = 0;
if ((flags & MDBX_SHRINK_ALLOWED) && pending->mm_geo.shrink &&
pending->mm_geo.now - pending->mm_geo.next > pending->mm_geo.shrink) {
const pgno_t aligner =
pending->mm_geo.grow ? pending->mm_geo.grow : pending->mm_geo.shrink;
const pgno_t aligned = pgno_align2os_pgno(
env, pending->mm_geo.next + aligner - pending->mm_geo.next % aligner);
if (pending->mm_geo.now > aligned) {
shrink = pending->mm_geo.now - aligned;
pending->mm_geo.now = aligned;
if (mdbx_meta_txnid_stable(env, head) == pending->mm_txnid_a)
mdbx_meta_set_txnid(env, pending, pending->mm_txnid_a + 1);
}
}
#endif /* not a Windows */
@ -4075,7 +4071,9 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
/* Windows is unable shrinking a mapped file */
#else
/* LY: shrink datafile if needed */
if (unlikely(shrink_pgno_delta)) {
if (unlikely(shrink)) {
mdbx_info("shrink to %" PRIaPGNO " pages (-%" PRIaPGNO ")",
pending->mm_geo.now, shrink);
rc = mdbx_mapresize(env, pending->mm_geo.now, pending->mm_geo.upper);
if (MDBX_IS_ERROR(rc))
goto fail;