merge-ort: add prefetching for content merges

Commit 7fbbcb2 ("diff: batch fetching of missing blobs", 2019-04-05)
introduced batching of fetching missing blobs, so that the diff
machinery would have one fetch subprocess grab N blobs instead of N
processes each grabbing 1.

However, the diff machinery is not the only thing in a merge that needs
to work on blobs.  The 3-way content merges need them as well.  Rather
than download all the blobs 1 at a time, prefetch all the blobs needed
for regular content merges.

This does not cover all possible paths in merge-ort that might need to
download blobs.  Others include:
  - The blob_unchanged() calls to avoid modify/delete conflicts (when
    blob renormalization results in an "unchanged" file)
  - Preliminary content merges needed for rename/add and
    rename/rename(2to1) style conflicts.  (Both of these types of
    conflicts can result in nested conflict markers from the need to do
    two levels of content merging; the first happens before our new
    prefetch_for_content_merges() function.)

The first of these wouldn't be an extreme amount of work to support, and
even the second could be theoretically supported in batching, but all of
these cases seem unusual to me, and this is a minor performance
optimization anyway; in the worst case we only get some of the fetches
batched and have a few additional one-off fetches.  So for now, just
handle the regular 3-way content merges in our prefetching.

For the testcase from the previous commit, the number of downloaded
objects remains at 63, but this drops the number of fetches needed from
32 down to 20, a sizeable reduction.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

merge-ort.c

@@ -29,6 +29,7 @@
 #include "entry.h"
 #include "ll-merge.h"
 #include "object-store.h"
+#include "promisor-remote.h"
 #include "revision.h"
 #include "strmap.h"
 #include "submodule.h"
@@ -3460,6 +3461,54 @@ static void process_entry(struct merge_options *opt,
 	record_entry_for_tree(dir_metadata, path, &ci->merged);
 }
 
+static void prefetch_for_content_merges(struct merge_options *opt,
+					struct string_list *plist)
+{
+	struct string_list_item *e;
+	struct oid_array to_fetch = OID_ARRAY_INIT;
+
+	if (opt->repo != the_repository || !has_promisor_remote())
+		return;
+
+	for (e = &plist->items[plist->nr-1]; e >= plist->items; --e) {
+		/* char *path = e->string; */
+		struct conflict_info *ci = e->util;
+		int i;
+
+		/* Ignore clean entries */
+		if (ci->merged.clean)
+			continue;
+
+		/* Ignore entries that don't need a content merge */
+		if (ci->match_mask || ci->filemask < 6 ||
+		    !S_ISREG(ci->stages[1].mode) ||
+		    !S_ISREG(ci->stages[2].mode) ||
+		    oideq(&ci->stages[1].oid, &ci->stages[2].oid))
+			continue;
+
+		/* Also don't need content merge if base matches either side */
+		if (ci->filemask == 7 &&
+		    S_ISREG(ci->stages[0].mode) &&
+		    (oideq(&ci->stages[0].oid, &ci->stages[1].oid) ||
+		     oideq(&ci->stages[0].oid, &ci->stages[2].oid)))
+			continue;
+
+		for (i = 0; i < 3; i++) {
+			unsigned side_mask = (1 << i);
+			struct version_info *vi = &ci->stages[i];
+
+			if ((ci->filemask & side_mask) &&
+			    S_ISREG(vi->mode) &&
+			    oid_object_info_extended(opt->repo, &vi->oid, NULL,
+						     OBJECT_INFO_FOR_PREFETCH))
+				oid_array_append(&to_fetch, &vi->oid);
+		}
+	}
+
+	promisor_remote_get_direct(opt->repo, to_fetch.oid, to_fetch.nr);
+	oid_array_clear(&to_fetch);
+}
+
 static void process_entries(struct merge_options *opt,
 			    struct object_id *result_oid)
 {
@@ -3506,6 +3555,7 @@ static void process_entries(struct merge_options *opt,
 	 * the way when it is time to process the file at the same path).
 	 */
 	trace2_region_enter("merge", "processing", opt->repo);
+	prefetch_for_content_merges(opt, &plist);
 	for (entry = &plist.items[plist.nr-1]; entry >= plist.items; --entry) {
 		char *path = entry->string;
 		/*

t/t6421-merge-partial-clone.sh

@@ -397,7 +397,7 @@ test_expect_merge_algorithm failure success 'Objects downloaded when a directory
 #
 #   Summary: 4 fetches (1 for 6 objects, 1 for 8, 1 for 3, 1 for 2)
 #
-test_expect_merge_algorithm failure failure 'Objects downloaded with lots of renames and modifications' '
+test_expect_merge_algorithm failure success 'Objects downloaded with lots of renames and modifications' '
 	test_setup_repo &&
 	git clone --sparse --filter=blob:none "file://$(pwd)/server" objects-many &&
 	(