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mdbx: msync only used part instead of entire db.

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Change-Id: I55611613f12d6e01599133336df183ada4d2de3d
This commit is contained in:
Leo Yuriev 2016-01-13 01:51:55 +03:00
parent 39908bb0a6
commit 4ad241b864
1 changed files with 3 additions and 1 deletions
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4
mdb.c
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@ -4097,6 +4097,7 @@ mdb_env_sync0(MDB_env *env, unsigned flags, MDB_meta *pending)
size_t prev_mapsize = head->mm_mapsize;
MDB_meta* tail = META_IS_WEAK(head) ? head : mdb_env_meta_flipflop(env, head);
off_t offset = (char*) tail - env->me_map;
size_t used_size = env->me_psize * (pending->mm_last_pg + 1);
mdb_assert(env, (env->me_flags & (MDB_RDONLY | MDB_FATAL_ERROR)) == 0);
mdb_assert(env, META_IS_WEAK(head) || env->me_sync_pending != 0
@ -4108,6 +4109,7 @@ mdb_env_sync0(MDB_env *env, unsigned flags, MDB_meta *pending)
mdb_assert(env, pending->mm_txnid > stay->mm_txnid);
pending->mm_mapsize = env->me_mapsize;
mdb_assert(env, pending->mm_mapsize >= used_size);
if (unlikely(pending->mm_mapsize != prev_mapsize)) {
if (pending->mm_mapsize < prev_mapsize) {
/* LY: currently this can't happen, but force full-sync. */
@ -4124,7 +4126,7 @@ mdb_env_sync0(MDB_env *env, unsigned flags, MDB_meta *pending)
if (env->me_sync_pending && (flags & MDB_NOSYNC) == 0) {
if (env->me_flags & MDB_WRITEMAP) {
int mode = (flags & MDB_MAPASYNC) ? MS_ASYNC : MS_SYNC;
if (unlikely(msync(env->me_map, pending->mm_mapsize, mode))) {
if (unlikely(msync(env->me_map, used_size, mode))) {
rc = errno;
goto fail;
}