builtin-pack-object: cache small deltas

Signed-off-by: Martin Koegler <mkoegler@auto.tuwien.ac.at>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index ab0f8f48655e27ee7b99a5e4c30e098a84cbcae5..6ea4f10150ee4034e4c24752a444ef324506ea69 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -572,6 +572,10 @@ pack.deltaCacheSize::
        gitlink:git-pack-objects[1].
        A value of 0 means no limit. Defaults to 0.
 
+pack.deltaCacheLimit::
+       The maxium size of a delta, that is cached in
+       gitlink:git-pack-objects[1]. Defaults to 1000.
+
 pull.octopus::
        The default merge strategy to use when pulling multiple branches
        at once.

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index 9f035ba8e645e45547fe3145674efb33cfc9cb23..41472fcbd09b4ab5c1732d7656ebc70e4fb563dd 100644 (file)
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -79,6 +79,7 @@ static int pack_compression_seen;
 
 static unsigned long delta_cache_size = 0;
 static unsigned long max_delta_cache_size = 0;
+static unsigned long cache_max_small_delta_size = 1000;
 
 /*
  * The object names in objects array are hashed with this hashtable,
@@ -1403,6 +1404,9 @@ static int delta_cacheable(struct unpacked *trg, struct unpacked *src,
        if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size)
                return 0;
 
+       if (delta_size < cache_max_small_delta_size)
+               return 1;
+
        /* cache delta, if objects are large enough compared to delta size */
        if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10))
                return 1;
@@ -1654,6 +1658,10 @@ static int git_pack_config(const char *k, const char *v)
                max_delta_cache_size = git_config_int(k, v);
                return 0;
        }
+       if (!strcmp(k, "pack.deltacachelimit")) {
+               cache_max_small_delta_size = git_config_int(k, v);
+               return 0;
+       }
        return git_default_config(k, v);
 }