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mdbx: fix madvise_threshold for large system pages.

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Fixed https://github.com/erthink/libmdbx/issues/157

Change-Id: I0e880591d236b6ba96a38d2a3fa953695d9c4df0
This commit is contained in:
Leonid Yuriev 2021-01-29 04:58:32 +03:00
parent 7e2de94e1f
commit 9c9f6faf38
1 changed files with 13 additions and 5 deletions
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18
src/core.c
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@ -9613,6 +9613,18 @@ static MDBX_meta *__cold mdbx_init_metas(const MDBX_env *env, void *buffer) {
return page_meta(page2);
}
static size_t mdbx_madvise_threshold(const MDBX_env *env,
const size_t largest_bytes) {
/* TODO: use options */
const unsigned factor = 9;
const size_t threshold = (largest_bytes < (65536ul << factor))
? 65536 /* minimal threshold */
: (largest_bytes > (MEGABYTE * 4 << factor))
? MEGABYTE * 4 /* maximal threshold */
: largest_bytes >> factor;
return bytes_align2os_bytes(env, threshold);
}
static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
MDBX_meta *const pending) {
mdbx_assert(env, ((env->me_flags ^ flags) & MDBX_WRITEMAP) == 0);
@ -9658,11 +9670,7 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
#if defined(MADV_DONTNEED)
const size_t largest_bytes = pgno2bytes(env, largest_pgno);
/* threshold to avoid unreasonable frequent madvise() calls */
const size_t madvise_threshold = (largest_bytes < 65536 * 256)
? 65536
: (largest_bytes > MEGABYTE * 4 * 256)
? MEGABYTE * 4
: largest_bytes >> 10;
const size_t madvise_threshold = mdbx_madvise_threshold(env, largest_bytes);
const size_t discard_edge_bytes = bytes_align2os_bytes(
env, ((MDBX_RDONLY &
(env->me_lck ? env->me_lck->mti_envmode : env->me_flags))