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mdbx: make enabling of read-ahead strategy more aggressive.

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Change-Id: I7765c1a1ac27db86ce9676846ec5a723860dc934
This commit is contained in:
Leonid Yuriev 2020-10-11 01:14:30 +03:00
parent 071ad525c8
commit 041a4c0aa5
1 changed files with 6 additions and 4 deletions
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10
src/core.c
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@ -4820,7 +4820,8 @@ static __cold int mdbx_mapresize(MDBX_env *env, const pgno_t used_pgno,
rc = mdbx_mresize(env->me_flags, &env->me_dxb_mmap, size_bytes, limit_bytes,
mapping_can_be_moved);
if (rc == MDBX_SUCCESS && (env->me_flags & MDBX_NORDAHEAD) == 0) {
const int readahead = mdbx_is_readahead_reasonable(size_bytes, 0);
const int readahead =
mdbx_is_readahead_reasonable(size_bytes, -(intptr_t)prev_size);
if (readahead == MDBX_RESULT_FALSE)
rc = mdbx_set_readahead(
env, 0, (size_bytes > prev_size) ? size_bytes : prev_size, false);
@ -9685,6 +9686,10 @@ static int __cold mdbx_setup_dxb(MDBX_env *env, const int lck_rc) {
mdbx_verbose("current boot-id %" PRIx64 "-%" PRIx64 " (%savailable)",
bootid.x, bootid.y, (bootid.x | bootid.y) ? "" : "not-");
/* calculate readahead hint before mmap with zero redundant pages */
const bool readahead =
(env->me_flags & MDBX_NORDAHEAD) == 0 &&
mdbx_is_readahead_reasonable(used_bytes, 0) == MDBX_RESULT_TRUE;
err = mdbx_mmap(env->me_flags, &env->me_dxb_mmap, env->me_dbgeo.now,
env->me_dbgeo.upper, lck_rc ? MMAP_OPTION_TRUNCATE : 0);
if (unlikely(err != MDBX_SUCCESS))
@ -9948,9 +9953,6 @@ static int __cold mdbx_setup_dxb(MDBX_env *env, const int lck_rc) {
#endif /* MADV_DONTNEED */
}
const bool readahead = (env->me_flags & MDBX_NORDAHEAD) == 0 &&
mdbx_is_readahead_reasonable(env->me_dxb_mmap.current,
0) == MDBX_RESULT_TRUE;
err = mdbx_set_readahead(env, 0, used_bytes, readahead);
if (err != MDBX_SUCCESS && lck_rc == /* lck exclusive */ MDBX_RESULT_TRUE)
return err;