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mdbx: move madvise(MADV_RANDOM) to under control of MDBX_NORDAHEAD flag.

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Change-Id: Ied2473ad054797a20ec2c177106a9a7e85fab1d1
This commit is contained in:
Leonid Yuriev 2019-10-12 06:28:26 +03:00
parent e04ea50c18
commit c51a6e6d95
1 changed files with 8 additions and 9 deletions
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5
src/elements/core.c
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@ -6568,6 +6568,8 @@ static int __cold mdbx_env_map(MDBX_env *env, const int is_exclusive,
return errno; return errno;
#endif #endif
/* Turn on/off readahead. It's harmful when the DB is larger than RAM. */
if (env->me_flags & MDBX_NORDAHEAD) {
#if defined(MADV_RANDOM) #if defined(MADV_RANDOM)
if (unlikely(madvise(env->me_map, env->me_mapsize, MADV_RANDOM) != 0)) if (unlikely(madvise(env->me_map, env->me_mapsize, MADV_RANDOM) != 0))
return errno; return errno;
@ -6576,9 +6578,6 @@ static int __cold mdbx_env_map(MDBX_env *env, const int is_exclusive,
if (unlikely(rc != 0)) if (unlikely(rc != 0))
return errno; return errno;
#endif #endif
/* Turn on/off readahead. It's harmful when the DB is larger than RAM. */
if (env->me_flags & MDBX_NORDAHEAD) {
#ifdef POSIX_FADV_DONTNEED #ifdef POSIX_FADV_DONTNEED
rc = posix_fadvise(env->me_fd, 0, env->me_mapsize, POSIX_FADV_DONTNEED); rc = posix_fadvise(env->me_fd, 0, env->me_mapsize, POSIX_FADV_DONTNEED);
if (unlikely(rc != 0)) if (unlikely(rc != 0))