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name-hash: precompute hash values during preload-index

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Precompute the istate.name_hash and istate.dir_hash values
for each cache-entry during the preload-index phase.

Move the expensive memihash() calculations from lazy_init_name_hash()
to the multi-threaded preload-index phase.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
This commit is contained in:
Jeff Hostetler
2016-11-17 09:59:59 -05:00
committed by Johannes Schindelin
parent d484faac20
commit d27bd052d2
4 changed files with 85 additions and 2 deletions
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3
read-cache.c
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@@ -73,6 +73,7 @@ void rename_index_entry_at(struct index_state *istate, int nr, const char *new_n
copy_cache_entry(new, old);
new->ce_flags &= ~CE_HASHED;
new->ce_namelen = namelen;
new->precompute_hash_state = 0;
new->index = 0;
memcpy(new->name, new_name, namelen + 1);
@@ -614,6 +615,7 @@ static struct cache_entry *create_alias_ce(struct index_state *istate,
new = xcalloc(1, cache_entry_size(len));
memcpy(new->name, alias->name, len);
copy_cache_entry(new, ce);
new->precompute_hash_state = 0;
save_or_free_index_entry(istate, ce);
return new;
}
@@ -1446,6 +1448,7 @@ static struct cache_entry *cache_entry_from_ondisk(struct ondisk_cache_entry *on
ce->ce_stat_data.sd_size = get_be32(&ondisk->size);
ce->ce_flags = flags & ~CE_NAMEMASK;
ce->ce_namelen = len;
ce->precompute_hash_state = 0;
ce->index = 0;
hashcpy(ce->oid.hash, ondisk->sha1);
memcpy(ce->name, name, len);