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From: Christian Couder <christian.couder@gmail.com>
To: git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>, Jeff King <peff@peff.net>,
	Christian Couder <chriscool@tuxfamily.org>,
	Ramsay Jones <ramsay@ramsayjones.plus.com>,
	Jonathan Tan <jonathantanmy@google.com>
Subject: [PATCH v4 08/12] pack-objects: introduce pack.allowPackReuse
Date: Wed, 18 Dec 2019 12:25:43 +0100	[thread overview]
Message-ID: <20191218112547.4974-9-chriscool@tuxfamily.org> (raw)
In-Reply-To: <20191218112547.4974-1-chriscool@tuxfamily.org>

From: Jeff King <peff@peff.net>

Let's make it possible to configure if we want pack reuse or not.

The main reason it might not be wanted is probably debugging and
performance testing, though pack reuse _might_ cause larger packs,
because we wouldn't consider the reused objects as bases for
finding new deltas.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 Documentation/config/pack.txt | 7 +++++++
 builtin/pack-objects.c        | 8 +++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Documentation/config/pack.txt b/Documentation/config/pack.txt
index 1d66f0c992..0dac580581 100644
--- a/Documentation/config/pack.txt
+++ b/Documentation/config/pack.txt
@@ -27,6 +27,13 @@ Note that changing the compression level will not automatically recompress
 all existing objects. You can force recompression by passing the -F option
 to linkgit:git-repack[1].
 
+pack.allowPackReuse::
+	When true, and when reachability bitmaps are enabled,
+	pack-objects will try to send parts of the bitmapped packfile
+	verbatim. This can reduce memory and CPU usage to serve fetches,
+	but might result in sending a slightly larger pack. Defaults to
+	true.
+
 pack.island::
 	An extended regular expression configuring a set of delta
 	islands. See "DELTA ISLANDS" in linkgit:git-pack-objects[1]
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 369f46fbc5..801e23dfe7 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -96,6 +96,7 @@ static off_t reuse_packfile_offset;
 
 static int use_bitmap_index_default = 1;
 static int use_bitmap_index = -1;
+static int allow_pack_reuse = 1;
 static enum {
 	WRITE_BITMAP_FALSE = 0,
 	WRITE_BITMAP_QUIET,
@@ -2699,6 +2700,10 @@ static int git_pack_config(const char *k, const char *v, void *cb)
 		use_bitmap_index_default = git_config_bool(k, v);
 		return 0;
 	}
+	if (!strcmp(k, "pack.allowpackreuse")) {
+		allow_pack_reuse = git_config_bool(k, v);
+		return 0;
+	}
 	if (!strcmp(k, "pack.threads")) {
 		delta_search_threads = git_config_int(k, v);
 		if (delta_search_threads < 0)
@@ -3030,7 +3035,8 @@ static void loosen_unused_packed_objects(void)
  */
 static int pack_options_allow_reuse(void)
 {
-	return pack_to_stdout &&
+	return allow_pack_reuse &&
+	       pack_to_stdout &&
 	       allow_ofs_delta &&
 	       !ignore_packed_keep_on_disk &&
 	       !ignore_packed_keep_in_core &&
-- 
2.24.1.498.g561400140f


  parent reply	other threads:[~2019-12-18 11:26 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-18 11:25 [PATCH v4 00/12] Rewrite packfile reuse code Christian Couder
2019-12-18 11:25 ` [PATCH v4 01/12] builtin/pack-objects: report reused packfile objects Christian Couder
2019-12-18 11:25 ` [PATCH v4 02/12] packfile: expose get_delta_base() Christian Couder
2019-12-18 11:25 ` [PATCH v4 03/12] ewah/bitmap: introduce bitmap_word_alloc() Christian Couder
2019-12-18 11:25 ` [PATCH v4 04/12] pack-bitmap: introduce bitmap_walk_contains() Christian Couder
2019-12-18 11:25 ` [PATCH v4 05/12] pack-bitmap: uninteresting oid can be outside bitmapped packfile Christian Couder
2019-12-18 11:25 ` [PATCH v4 06/12] pack-bitmap: simplify bitmap_has_oid_in_uninteresting() Christian Couder
2019-12-18 11:25 ` [PATCH v4 07/12] csum-file: introduce hashfile_total() Christian Couder
2019-12-18 11:25 ` Christian Couder [this message]
2019-12-18 11:25 ` [PATCH v4 09/12] builtin/pack-objects: introduce obj_is_packed() Christian Couder
2019-12-18 11:25 ` [PATCH v4 10/12] pack-objects: improve partial packfile reuse Christian Couder
2019-12-18 11:25 ` [PATCH v4 11/12] pack-objects: add checks for duplicate objects Christian Couder
2019-12-18 11:25 ` [PATCH v4 12/12] pack-bitmap: don't rely on bitmap_git->reuse_objects Christian Couder

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