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From: Teng Long <dyroneteng@gmail.com>
To: dyroneteng@gmail.com
Cc: avarab@gmail.com, derrickstolee@github.com, git@vger.kernel.org,
	gitster@pobox.com, me@ttaylorr.com, peff@peff.net,
	tenglong.tl@alibaba-inc.com
Subject: [PATCH v3 1/2] pack-bitmap.c: remove unnecessary "open_pack_index()" calls
Date: Thu, 10 Nov 2022 15:10:11 +0800	[thread overview]
Message-ID: <aaeb021538cdfeb83dc6004fe7b3ac35a23aef49.1668063122.git.dyroneteng@gmail.com> (raw)
In-Reply-To: <cover.1668063122.git.dyroneteng@gmail.com>

From: Teng Long <dyroneteng@gmail.com>

When trying to open a pack bitmap, we call open_pack_bitmap_1() in a
loop, during which it tries to open up the pack index corresponding
with each available pack.

It's likely that we'll end up relying on objects in that pack later
in the process (in which case we're doing the work of opening the
pack index optimistically), but not guaranteed.

For instance, consider a repository with a large number of small
packs, and one large pack with a bitmap. If we see that bitmap pack
last in our loop which calls open_pack_bitmap_1(), the current code
will have opened *all* pack index files in the repository. If the
request can be served out of the bitmapped pack alone, then the time
spent opening these idx files was wasted.S

Since open_pack_bitmap_1() calls is_pack_valid() later on (which in
turns calls open_pack_index() itself), we can just drop the earlier
call altogether.

Signed-off-by: Teng Long <dyroneteng@gmail.com>
---
 pack-bitmap.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/pack-bitmap.c b/pack-bitmap.c
index 440407f1be..982e286bac 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -411,9 +411,6 @@ static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git
 	struct stat st;
 	char *bitmap_name;
 
-	if (open_pack_index(packfile))
-		return -1;
-
 	bitmap_name = pack_bitmap_filename(packfile);
 	fd = git_open(bitmap_name);
 
-- 
2.38.1.383.g7ac9b859f31.dirty


  reply	other threads:[~2022-11-10  7:10 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-26  7:09 [PATCH 0/1] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-08-26  7:09 ` [PATCH 1/1] " Teng Long
2022-08-26 16:34 ` [PATCH 0/1] " Junio C Hamano
2022-08-29  2:48   ` Teng Long
2022-10-26 21:42     ` Taylor Blau
2022-10-26 23:19       ` Ævar Arnfjörð Bjarmason
2022-10-31 13:20         ` Teng Long
2022-10-27 20:45       ` Jeff King
2022-10-30 18:42         ` Taylor Blau
2022-10-31 12:22           ` [PATCH 0/1] pack-bitmap.c: avoid exposing absolute paths Taylor Blau <me@ttaylorr.com> writes: Teng Long
2022-11-02  5:37         ` [PATCH 0/1] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-02  7:54           ` Jeff King
2022-11-02 13:52             ` Teng Long
2022-10-31 13:13       ` Teng Long
2022-11-03  1:00         ` Taylor Blau
2022-11-02  9:20 ` Ævar Arnfjörð Bjarmason
2022-11-02 13:04   ` Teng Long
2022-11-02 12:56 ` [PATCH v2 " Teng Long
2022-11-02 12:56   ` [PATCH v2 1/1] " Teng Long
2022-11-03  1:16     ` Taylor Blau
2022-11-03  9:35       ` Teng Long
2022-11-05  0:35         ` Taylor Blau
2022-11-03  1:21   ` [PATCH v2 0/1] " Taylor Blau
2022-11-03  8:42     ` Teng Long
2022-11-04  3:17   ` [PATCH v3 0/2] " Teng Long
2022-11-04  3:17     ` [PATCH v3 1/2] " Teng Long
2022-11-04 22:11       ` Taylor Blau
2022-11-04  3:17     ` [PATCH v3 2/2] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Teng Long
2022-11-04 22:09       ` Taylor Blau
2022-11-04 22:13     ` [PATCH v3 0/2] pack-bitmap.c: avoid exposing absolute paths Taylor Blau
2022-11-10  7:10     ` Teng Long
2022-11-10  7:10       ` Teng Long [this message]
2022-11-14 22:03         ` [PATCH v3 1/2] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Jeff King
2022-11-14 22:14           ` Taylor Blau
2022-11-14 22:31             ` Jeff King
2022-11-14 22:50               ` Taylor Blau
2022-11-10  7:10       ` [PATCH v3 2/2] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-11 22:26       ` [PATCH v3 0/2] " Taylor Blau
2022-11-14 22:23         ` Jeff King
2022-11-17 14:19           ` Teng Long
2022-11-17 15:03             ` Jeff King
2022-11-17 21:57               ` Taylor Blau
2022-11-21  3:27                 ` Teng Long
2022-11-21 12:16     ` [PATCH v4 0/4] " Teng Long
2022-11-21 12:16       ` [PATCH v4 1/4] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Teng Long
2022-11-21 12:16       ` [PATCH v4 2/4] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-21 12:16       ` [PATCH v4 3/4] pack-bitmap.c: break out of the bitmap loop early if not tracing Teng Long
2022-11-21 23:27         ` Junio C Hamano
2022-11-28 13:09           ` Teng Long
2022-11-21 12:16       ` [PATCH v4 4/4] pack-bitmap.c: trace bitmap ignore logs when midx-bitmap is found Teng Long
2022-11-21 19:09         ` Jeff King
2022-11-21 23:29           ` Junio C Hamano
2022-11-28 12:29             ` Teng Long
2022-11-28 12:37           ` Teng Long
2022-11-29  1:27             ` Jeff King
2022-11-29 13:14               ` Teng Long
2022-11-21 19:04       ` [PATCH v4 0/4] pack-bitmap.c: avoid exposing absolute paths Jeff King
2022-11-28 12:48         ` Teng Long
2022-11-28 14:09       ` [PATCH v5 " Teng Long
2022-11-28 14:09         ` [PATCH v5 1/4] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Teng Long
2022-11-28 14:09         ` [PATCH v5 2/4] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-28 14:09         ` [PATCH v5 3/4] pack-bitmap.c: break out of the bitmap loop early if not tracing Teng Long
2022-11-28 23:26           ` Taylor Blau
2022-11-29 13:17             ` Teng Long
2022-11-28 14:09         ` [PATCH v5 4/4] pack-bitmap.c: trace bitmap ignore logs when midx-bitmap is found Teng Long
2022-11-28 23:30         ` [PATCH v5 0/4] pack-bitmap.c: avoid exposing absolute paths Taylor Blau
2022-11-29 13:21           ` Teng Long

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