From: Taylor Blau <me@ttaylorr.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: Junio C Hamano <gitster@pobox.com>, Jeff King <peff@peff.net>,
Taylor Blau <me@ttaylorr.com>,
git@vger.kernel.org, dstolee@microsoft.com
Subject: Re: [PATCH 1/1] commit-graph.c: avoid unnecessary tag dereference when merging
Date: Sat, 21 Mar 2020 18:20:05 -0600 [thread overview]
Message-ID: <20200322002005.GA48038@syl.local> (raw)
In-Reply-To: <a0de34e3-3f60-1838-dbaf-2ee3dddc7c89@gmail.com>
On Sat, Mar 21, 2020 at 08:03:01PM -0400, Derrick Stolee wrote:
> On 3/21/2020 2:50 PM, Junio C Hamano wrote:
> > Do we need to worry about INFO_QUICK and SKIP_FETCH_OBJECT in this
> > codepath, by the way?
>
> I was coming back to this thread to bring up these exact flags for
> consideration. The good news is that in a partial clone with any
> amount of filtering we will still have all reachable commits, which
> are necessary for the commit-graph to make sense. The only ones that
> would fail has_object_file() are ones removed by GC, but they may
> still exist on the remote. So without SKIP_FETCH_OBJECT, we would
> generate a network call even if the server has GC'd to remove the
> commits. This gets particularly bad when the server returns all
> reachable objects from that commit!
That makes sense. Do you think something like this should be applied?
diff --git a/commit-graph.c b/commit-graph.c
index c7cfadc786..0097318798 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1594,6 +1594,7 @@ static void merge_commit_graph(struct write_commit_graph_context *ctx,
{
uint32_t i;
uint32_t offset = g->num_commits_in_base;
+ int flags = OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT;
ALLOC_GROW(ctx->commits.list, ctx->commits.nr + g->num_commits, ctx->commits.alloc);
@@ -1606,7 +1607,7 @@ static void merge_commit_graph(struct write_commit_graph_context *ctx,
load_oid_from_graph(g, i + offset, &oid);
/* only add commits if they still exist in the repo */
- if (repo_has_object_file(ctx->r, &oid)) {
+ if (repo_has_object_file_with_flags(ctx->r, &oid, flags)) {
result = lookup_commit(ctx->r, &oid);
if (repo_parse_commit(ctx->r, result))
result = NULL;
> Thanks,
> -Stolee
Thanks,
Taylor
next prev parent reply other threads:[~2020-03-22 0:20 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-21 3:44 [PATCH 0/1] commit-graph: avoid unnecessary tag deference when merging Taylor Blau
2020-03-21 3:44 ` [PATCH 1/1] commit-graph.c: avoid unnecessary tag dereference " Taylor Blau
2020-03-21 5:00 ` Jeff King
2020-03-21 6:11 ` Taylor Blau
2020-03-21 6:24 ` Taylor Blau
2020-03-21 7:03 ` Jeff King
2020-03-21 17:27 ` Taylor Blau
2020-03-22 5:36 ` Jeff King
2020-03-22 11:04 ` SZEDER Gábor
2020-03-22 18:45 ` looking up object types quickly, was " Jeff King
2020-03-22 19:18 ` Jeff King
2020-03-23 20:15 ` Taylor Blau
2020-03-22 16:45 ` Taylor Blau
2020-03-24 6:06 ` Jeff King
2020-03-21 18:50 ` Junio C Hamano
2020-03-22 0:03 ` Derrick Stolee
2020-03-22 0:20 ` Taylor Blau [this message]
2020-03-22 0:23 ` Derrick Stolee
2020-03-22 5:49 ` Jeff King
2020-03-22 6:04 ` Jeff King
2020-03-22 15:47 ` Taylor Blau
2020-03-24 6:11 ` Jeff King
2020-03-24 23:08 ` Taylor Blau
2020-03-27 8:42 ` Jeff King
2020-03-27 15:03 ` Taylor Blau
2020-03-22 15:44 ` Taylor Blau
2020-03-24 6:14 ` Jeff King
2020-03-21 5:01 ` Junio C Hamano
2020-03-21 4:56 ` [PATCH 0/1] commit-graph: avoid unnecessary tag deference " Junio C Hamano
2020-03-21 5:04 ` Jeff King
2020-03-21 6:12 ` Taylor Blau
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