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mdbx: fix madvise() flags, it is not a bitmask.

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Change-Id: Ie5109779dc596190c467dcd6e84a1684e71575f5
This commit is contained in:
Leo Yuriev 2016-02-04 06:22:36 +03:00
parent 0e508f0d3b
commit 425ac1cde6
1 changed files with 14 additions and 5 deletions
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19
mdb.c
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@ -4288,15 +4288,24 @@ mdb_env_map(MDB_env *env, void *addr)
return errno;
}
unsigned madvise_flags = MADV_DONTFORK;
if (flags & MDB_NORDAHEAD)
if (flags & MDB_NORDAHEAD) {
/* Turn off readahead. It's harmful when the DB is larger than RAM. */
madvise_flags |= MADV_RANDOM;
if (madvise(env->me_map, env->me_mapsize, madvise_flags))
if (madvise(env->me_map, env->me_mapsize, MADV_RANDOM) < 0)
return errno;
}
if (madvise(env->me_map, env->me_mapsize, MADV_DONTFORK) < 0)
return errno;
if (madvise(env->me_map, env->me_mapsize, MADV_WILLNEED) < 0)
return errno;
#ifdef MADV_NOHUGEPAGE
(void) madvise(env->me_map, env->me_mapsize, MADV_NOHUGEPAGE);
#endif
#ifdef MADV_DONTDUMP
madvise(env->me_map, env->me_mapsize, MADV_DONTDUMP);
(void) madvise(env->me_map, env->me_mapsize, MADV_DONTDUMP);
#endif
/* Can happen because the address argument to mmap() is just a