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mdbx: use POSIX_MADV_DONTNEED.

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Change-Id: I2020eb8ec225a49331cf4dc6c5a24d6559916284
This commit is contained in:
Leonid Yuriev
2021-04-19 15:42:39 +03:00
parent b3b6a48797
commit 7a0d6c6196
1 changed files with 9 additions and 2 deletions
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11
src/core.c
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@@ -10255,7 +10255,8 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
pgno2bytes(env, edge - largest_pgno));
}
#endif /* MDBX_USE_VALGRIND || __SANITIZE_ADDRESS__ */
#if MDBX_ENABLE_MADVISE && defined(MADV_DONTNEED)
#if MDBX_ENABLE_MADVISE && \
(defined(MADV_DONTNEED) || defined(POSIX_MADV_DONTNEED))
const size_t largest_bytes = pgno2bytes(env, largest_pgno);
/* threshold to avoid unreasonable frequent madvise() calls */
const size_t madvise_threshold = mdbx_madvise_threshold(env, largest_bytes);
@@ -10275,6 +10276,7 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
const size_t prev_discarded_bytes =
ceil_powerof2(pgno2bytes(env, prev_discarded_pgno), env->me_os_psize);
mdbx_ensure(env, prev_discarded_bytes > discard_edge_bytes);
#if defined(MADV_DONTNEED)
int advise = MADV_DONTNEED;
#if defined(MADV_FREE) && \
0 /* MADV_FREE works for only anonymous vma at the moment */
@@ -10286,10 +10288,15 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
prev_discarded_bytes - discard_edge_bytes, advise)
? ignore_enosys(errno)
: MDBX_SUCCESS;
#else
int err = ignore_enosys(posix_madvise(
env->me_map + discard_edge_bytes,
prev_discarded_bytes - discard_edge_bytes, POSIX_MADV_DONTNEED));
#endif
if (unlikely(MDBX_IS_ERROR(err)))
return err;
}
#endif /* MDBX_ENABLE_MADVISE && MADV_DONTNEED */
#endif /* MDBX_ENABLE_MADVISE && (MADV_DONTNEED || POSIX_MADV_DONTNEED) */
/* LY: check conditions to shrink datafile */
const pgno_t backlog_gap = 3 + pending->mm_dbs[FREE_DBI].md_depth * 3;