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mdbx: rework MADV_DONTNEED threshold.
Change-Id: I99058b96e9c54c56d37c6c963b01cf18458d37ba
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@ -7465,21 +7465,29 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
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}
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#endif /* MDBX_USE_VALGRIND */
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#if defined(MADV_DONTNEED)
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const size_t largest_aligned2os_bytes =
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pgno_align2os_bytes(env, largest_pgno);
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const pgno_t largest_aligned2os_pgno =
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bytes2pgno(env, largest_aligned2os_bytes);
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const size_t largest_bytes = pgno2bytes(env, largest_pgno);
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const size_t madvise_gap = (largest_bytes < 65536 * 256)
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? 65536
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: (largest_bytes > MEGABYTE * 4 * 256)
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? MEGABYTE * 4
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: largest_bytes >> 8;
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const size_t discard_edge_bytes = bytes_align2os_bytes(
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env,
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(MDBX_RDONLY & (env->me_lck ? env->me_lck->mti_envmode : env->me_flags))
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? largest_bytes
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: largest_bytes + madvise_gap);
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const pgno_t discard_edge_pgno = bytes2pgno(env, discard_edge_bytes);
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const pgno_t prev_discarded_pgno = *env->me_discarded_tail;
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if (prev_discarded_pgno >
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largest_aligned2os_pgno +
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/* 1M threshold to avoid unreasonable madvise() call */
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bytes2pgno(env, MEGABYTE)) {
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discard_edge_pgno +
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/* threshold to avoid unreasonable frequent madvise() calls */
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bytes2pgno(env, madvise_gap)) {
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mdbx_notice("open-MADV_%s %u..%u", "DONTNEED", *env->me_discarded_tail,
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largest_pgno);
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*env->me_discarded_tail = largest_aligned2os_pgno;
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*env->me_discarded_tail = discard_edge_pgno;
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const size_t prev_discarded_bytes =
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pgno2bytes(env, prev_discarded_pgno) & ~(env->me_os_psize - 1);
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mdbx_ensure(env, prev_discarded_bytes > largest_aligned2os_bytes);
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mdbx_ensure(env, prev_discarded_bytes > discard_edge_bytes);
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int advise = MADV_DONTNEED;
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#if defined(MADV_FREE) && \
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0 /* MADV_FREE works for only anonymous vma at the moment */
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@ -7487,8 +7495,8 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
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mdbx_linux_kernel_version > 0x04050000)
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advise = MADV_FREE;
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#endif /* MADV_FREE */
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int err = madvise(env->me_map + largest_aligned2os_bytes,
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prev_discarded_bytes - largest_aligned2os_bytes, advise)
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int err = madvise(env->me_map + discard_edge_bytes,
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prev_discarded_bytes - discard_edge_bytes, advise)
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? ignore_enosys(errno)
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: MDBX_SUCCESS;
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if (unlikely(MDBX_IS_ERROR(err)))
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