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mdbx: fix ceiling/flooring madvise-edge inside mdbx_sync_locked().

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Fixes https://github.com/erthink/libmdbx/issues/91

Change-Id: I17da72d9a53a2c7453d81488bd3297063de0b7d1
This commit is contained in:
Leonid Yuriev 2020-04-07 03:23:30 +03:00
parent 94e58d7acc
commit 921f43da6f
1 changed files with 13 additions and 14 deletions
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27
src/elements/core.c
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@ -8403,27 +8403,26 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
#endif /* MDBX_USE_VALGRIND || __SANITIZE_ADDRESS__ */
#if defined(MADV_DONTNEED)
const size_t largest_bytes = pgno2bytes(env, largest_pgno);
const size_t madvise_gap = (largest_bytes < 65536 * 256)
? 65536
: (largest_bytes > MEGABYTE * 4 * 256)
? MEGABYTE * 4
: largest_bytes >> 8;
/* threshold to avoid unreasonable frequent madvise() calls */
const size_t madvise_treshold = (largest_bytes < 65536 * 256)
? 65536
: (largest_bytes > MEGABYTE * 4 * 256)
? MEGABYTE * 4
: largest_bytes >> 10;
const size_t discard_edge_bytes = bytes_align2os_bytes(
env,
(MDBX_RDONLY & (env->me_lck ? env->me_lck->mti_envmode : env->me_flags))
? largest_bytes
: largest_bytes + madvise_gap);
env, ((MDBX_RDONLY &
(env->me_lck ? env->me_lck->mti_envmode : env->me_flags))
? largest_bytes
: largest_bytes + madvise_treshold));
const pgno_t discard_edge_pgno = bytes2pgno(env, discard_edge_bytes);
const pgno_t prev_discarded_pgno = *env->me_discarded_tail;
if (prev_discarded_pgno >
discard_edge_pgno +
/* threshold to avoid unreasonable frequent madvise() calls */
bytes2pgno(env, madvise_gap)) {
if (prev_discarded_pgno >=
discard_edge_pgno + bytes2pgno(env, madvise_treshold)) {
mdbx_notice("open-MADV_%s %u..%u", "DONTNEED", *env->me_discarded_tail,
largest_pgno);
*env->me_discarded_tail = discard_edge_pgno;
const size_t prev_discarded_bytes =
pgno2bytes(env, prev_discarded_pgno) & ~(env->me_os_psize - 1);
ceil_powerof2(pgno2bytes(env, prev_discarded_pgno), env->me_os_psize);
mdbx_ensure(env, prev_discarded_bytes > discard_edge_bytes);
int advise = MADV_DONTNEED;
#if defined(MADV_FREE) && \