diff mbox series

[v3,18/20] maintenance: add incremental-repack auto condition

Message ID 801b262d1c26625d3f174fd80d7ddd336328bdd6.1596147867.git.gitgitgadget@gmail.com (mailing list archive)
State New, archived
Headers show
Series Maintenance builtin, allowing 'gc --auto' customization | expand

Commit Message

John Passaro via GitGitGadget July 30, 2020, 10:24 p.m. UTC 
From: Derrick Stolee <dstolee@microsoft.com>

The incremental-repack task updates the multi-pack-index by deleting pack-
files that have been replaced with new packs, then repacking a batch of
small pack-files into a larger pack-file. This incremental repack is faster
than rewriting all object data, but is slower than some other
maintenance activities.

The 'maintenance.incremental-repack.auto' config option specifies how many
pack-files should exist outside of the multi-pack-index before running
the step. These pack-files could be created by 'git fetch' commands or
by the loose-objects task. The default value is 10.

Setting the option to zero disables the task with the '--auto' option,
and a negative value makes the task run every time.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 Documentation/config/maintenance.txt |  9 ++++++++
 builtin/gc.c                         | 31 ++++++++++++++++++++++++++++
 t/t7900-maintenance.sh               | 30 +++++++++++++++++++++++++++
 3 files changed, 70 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/config/maintenance.txt b/Documentation/config/maintenance.txt
index a9442dd260..22229e7174 100644
--- a/Documentation/config/maintenance.txt
+++ b/Documentation/config/maintenance.txt
@@ -21,3 +21,12 @@  maintenance.loose-objects.auto::
 	positive value implies the command should run when the number of
 	loose objects is at least the value of `maintenance.loose-objects.auto`.
 	The default value is 100.
+
+maintenance.incremental-repack.auto::
+	This integer config option controls how often the `incremental-repack`
+	task should be run as part of `git maintenance run --auto`. If zero,
+	then the `incremental-repack` task will not run with the `--auto`
+	option. A negative value will force the task to run every time.
+	Otherwise, a positive value implies the command should run when the
+	number of pack-files not in the multi-pack-index is at least the value
+	of `maintenance.incremental-repack.auto`. The default value is 10.
diff --git a/builtin/gc.c b/builtin/gc.c
index 3b27dc7e7f..6ccc0cca19 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -31,6 +31,7 @@ 
 #include "remote.h"
 #include "midx.h"
 #include "refs.h"
+#include "object-store.h"
 
 #define FAILED_RUN "failed to run %s"
 
@@ -1029,6 +1030,35 @@  static int maintenance_task_loose_objects(void)
 	return prune_packed() || pack_loose();
 }
 
+static int incremental_repack_auto_condition(void)
+{
+	struct packed_git *p;
+	int enabled;
+	int incremental_repack_auto_limit = 10;
+	int count = 0;
+
+	if (git_config_get_bool("core.multiPackIndex", &enabled) ||
+	    !enabled)
+		return 0;
+
+	git_config_get_int("maintenance.incremental-repack.auto",
+			   &incremental_repack_auto_limit);
+
+	if (!incremental_repack_auto_limit)
+		return 0;
+	if (incremental_repack_auto_limit < 0)
+		return 1;
+
+	for (p = get_packed_git(the_repository);
+	     count < incremental_repack_auto_limit && p;
+	     p = p->next) {
+		if (!p->multi_pack_index)
+			count++;
+	}
+
+	return count >= incremental_repack_auto_limit;
+}
+
 static int multi_pack_index_write(void)
 {
 	struct child_process child = CHILD_PROCESS_INIT;
@@ -1218,6 +1248,7 @@  static struct maintenance_task tasks[] = {
 	[TASK_INCREMENTAL_REPACK] = {
 		"incremental-repack",
 		maintenance_task_incremental_repack,
+		incremental_repack_auto_condition,
 	},
 	[TASK_GC] = {
 		"gc",
diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
index 32ac5c9fb7..c8ccaa0a3d 100755
--- a/t/t7900-maintenance.sh
+++ b/t/t7900-maintenance.sh
@@ -182,4 +182,34 @@  test_expect_success 'incremental-repack task' '
 	test_line_count = 2 packs-after
 '
 
+test_expect_success 'maintenance.incremental-repack.auto' '
+	git repack -adk &&
+	git config core.multiPackIndex true &&
+	git multi-pack-index write &&
+	GIT_TRACE2_EVENT=1 git -c maintenance.incremental-repack.auto=1 \
+		maintenance run --auto --task=incremental-repack >out &&
+	! grep "\"multi-pack-index\"" out &&
+	for i in 1 2
+	do
+		test_commit A-$i &&
+		git pack-objects --revs .git/objects/pack/pack <<-\EOF &&
+		HEAD
+		^HEAD~1
+		EOF
+		GIT_TRACE2_EVENT=$(pwd)/trace-A-$i git \
+			-c maintenance.incremental-repack.auto=2 \
+			maintenance run --auto --task=incremental-repack &&
+		! grep "\"multi-pack-index\"" trace-A-$i &&
+		test_commit B-$i &&
+		git pack-objects --revs .git/objects/pack/pack <<-\EOF &&
+		HEAD
+		^HEAD~1
+		EOF
+		GIT_TRACE2_EVENT=$(pwd)/trace-B-$i git \
+			-c maintenance.incremental-repack.auto=2 \
+			maintenance run --auto --task=incremental-repack >out &&
+		grep "\"multi-pack-index\"" trace-B-$i >/dev/null || return 1
+	done
+'
+
 test_done