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Michael Montalbo 4e6973492f blame: read precomputed hunks 
Before diffing a target blob against a parent, offer the pair's identity
to the hunk provider interface.  Blame's requests have gone through
diff_provider_emit_hunks() since the interface arrived, but carried no
identity, so nothing could answer them.  Now blame fills in the pair's
blob object ids and its diff options, and the chain serves the pair from
the store, keyed by the ids and the request's xdiff flags, before the
terminal provider falls back to fill-and-compute.  Blame diffs at zero
context, which is not part of the key.  An answer replays the recorded
hunks through blame_chunk_cb without loading either blob; a request
carrying -I patterns or anchors is outside the key and always computes.

Blame withholds the identity where its diff is not the plain blob-pair
diff the key describes: reverse blame, ignored revisions, textconv
paths, and the working-tree or --contents pseudo-commit, whose blob is
not a stored object.  Those requests always compute.  Whitespace and
algorithm options such as -w instead change blame's xdl_opts, so the
consult keys a different entry and misses a store warmed without them.
Blame's default xdl_opts now come from DIFF_HUNKS_DEFAULT_XDL_OPTS, new
here, which records the key-relevant defaults a diff_options-based
consumer already carries (today the indent heuristic), so a default
blame run and a default "log --stat" warming run share keys by
construction.

"--show-stats" reports how many pairs the store served and how many
consultations it could not, read from diff_hunks_read_stats(); the store
counts its own consultations, so blame keeps no tally.

Extend t4220 with the blame side:

- parity for plain, --porcelain, and --incremental output, and hit and
  miss accounting across warming runs;
- the blame inputs that must bypass or miss the store: -w, indent
  heuristics, --reverse, textconv, -M/-C, and the --ignore-rev pass;
- rename and merge handling, and --contents;
- reading a truncated or corrupt store as absent, and a crafted
  zero-hunk record as a miss that verify flags.

Add p4218, measuring the cost of a warming run and the read speedups.

Signed-off-by: Michael Montalbo <mmontalbo@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
 		2026-08-01 15:09:51 -07:00
..
add.c odb/transaction: introduce ODB transaction flags 2026-07-10 13:21:53 -07:00
am.c hook: mark non-parallelizable hooks 2026-04-10 07:58:53 -07:00
annotate.c
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apply.c
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archive.c connect: use "service" enum for "name" argument 2026-05-19 15:05:46 +09:00
backfill.c path-walk: add pl_sparse_trees to control tree pruning 2026-05-24 18:41:06 +09:00
bisect.c bisect: ensure non-NULL `head` before using it 2026-07-10 08:13:55 -07:00
blame.c blame: read precomputed hunks 2026-08-01 15:09:51 -07:00
branch.c branch: suggest <remote>/<branch> on upstream slip 2026-06-27 19:36:43 -07:00
bugreport.c
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bundle.c
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cat-file.c Merge branch 'ps/odb-drop-whence' 2026-07-15 13:24:18 -07:00
check-attr.c environment: stop using `the_repository` in `is_bare_repository()` 2026-06-11 05:05:54 -07:00
check-ignore.c
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check-mailmap.c mailmap: stop using the_repository 2026-02-20 08:13:58 -08:00
check-ref-format.c setup: stop using `the_repository` in `setup_git_directory_gently()` 2026-05-19 19:36:24 +09:00
checkout--worker.c
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checkout-index.c setup: stop using `the_repository` in `prefix_path()` 2026-05-19 19:36:24 +09:00
checkout.c refs: move parsing of "core.logAllRefUpdates" back into ref stores 2026-06-26 08:27:19 -07:00
clean.c
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clone.c setup: pass worktree to `init_db()` 2026-07-07 10:49:41 -07:00
column.c
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commit-graph.c commit-graph: add new config for changed-paths & recommend it in scalar 2025-10-22 10:40:11 -07:00
commit-tree.c commit: rename `free_commit_list()` to conform to coding guidelines 2026-01-15 05:32:31 -08:00
commit.c sequencer: teach autostash apply to take optional conflict marker labels 2026-04-29 21:46:03 +09:00
config.c config: improve diagnostic for "set" with missing value 2026-06-03 08:39:54 +09:00
count-objects.c
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credential-cache--daemon.c
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credential-cache.c
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credential-store.c builtin/credential-store: move is_rfc3986_unreserved to url.[ch] 2026-01-12 11:56:56 -08:00
credential.c
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describe.c Merge branch 'kk/prio-queue-get-put-fusion' 2026-07-13 08:27:27 -07:00
diagnose.c
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diff-files.c
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diff-hunks.c diff-hunks: add the store format, library, and command 2026-08-01 15:09:51 -07:00
diff-index.c setup: stop using `the_repository` in `setup_work_tree()` 2026-05-19 19:36:24 +09:00
diff-pairs.c
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diff-tree.c diff: record precomputed hunks during stat output 2026-08-01 15:09:51 -07:00
diff.c diff: record precomputed hunks during stat output 2026-08-01 15:09:51 -07:00
difftool.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
fast-export.c fast-export: standardize usage string and SYNOPSIS 2026-07-13 08:54:29 -07:00
fast-import.c Merge branch 'jk/hash-algo-leak-fixes' 2026-07-16 23:05:47 -07:00
fetch-pack.c connect: use "service" enum for "name" argument 2026-05-19 15:05:46 +09:00
fetch.c Merge branch 'ty/migrate-ignorecase' 2026-07-19 10:42:19 -07:00
fmt-merge-msg.c
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for-each-ref.c
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for-each-repo.c for-each-repo: simplify passing of parameters 2026-03-03 10:20:00 -08:00
fsck.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
fsmonitor--daemon.c fsmonitor: plug token-data leak on early daemon-startup failures 2026-07-05 09:12:10 -07:00
gc.c Merge branch 'ps/setup-drop-global-state' 2026-07-06 15:50:19 -07:00
get-tar-commit-id.c
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grep.c Merge branch 'ps/odb-generalize-prepare' 2026-07-13 08:27:28 -07:00
hash-object.c setup: stop using `the_repository` in `setup_git_directory()` 2026-05-19 19:36:25 +09:00
help.c setup: stop using `the_repository` in `setup_git_directory_gently()` 2026-05-19 19:36:24 +09:00
history.c Merge branch 'ps/history-drop' 2026-07-15 13:24:19 -07:00
hook.c hook: allow hook.jobs=-1 to use all available CPU cores 2026-04-10 07:58:55 -07:00
index-pack.c Merge branch 'jk/git-hash-cleanups' 2026-07-16 23:05:48 -07:00
init-db.c setup: pass worktree to `init_db()` 2026-07-07 10:49:41 -07:00
interpret-trailers.c Merge branch 'kh/doc-interpret-trailers-1' 2026-03-27 11:00:02 -07:00
last-modified.c prio-queue: rename .nr to .nr_ and add accessor helpers 2026-06-09 11:11:46 -07:00
log.c diff: read precomputed hunks for stat output 2026-08-01 15:09:51 -07:00
ls-files.c Merge branch 'js/objects-larger-than-4gb-on-windows-more' 2026-06-21 16:41:38 -07:00
ls-remote.c ref-filter: propagate peeled object ID 2025-11-04 07:32:25 -08:00
ls-tree.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
mailinfo.c
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mailsplit.c mailsplit: move NULL check before first use of file handle 2026-07-10 08:13:54 -07:00
merge-base.c commit-reach: early exit paint_down_to_common for single merge-base 2026-05-12 09:33:43 +09:00
merge-file.c setup: stop using `the_repository` in `setup_git_directory()` 2026-05-19 19:36:25 +09:00
merge-index.c
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merge-ours.c merge-ours: integrate with sparse-index 2026-02-06 11:45:33 -08:00
merge-recursive.c
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merge-tree.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
merge.c Merge branch 'kk/merge-octopus-optim' 2026-05-27 14:15:44 +09:00
mktag.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
mktree.c builtin/mktree: remove USE_THE_REPOSITORY_VARIABLE 2026-03-12 10:03:23 -07:00
multi-pack-index.c midx: refactor interfaces to work on "packed" source 2026-06-17 05:00:01 -07:00
mv.c Merge branch 'ty/migrate-ignorecase' 2026-07-19 10:42:19 -07:00
name-rev.c Merge branch 'kh/name-rev-custom-format' 2026-05-19 09:57:44 +09:00
notes.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
pack-objects.c Merge branch 'ps/odb-drop-whence' 2026-07-15 13:24:18 -07:00
pack-redundant.c pack-redundant: fix memory leak when open_pack_index() fails 2026-02-21 21:26:53 -08:00
pack-refs.c
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patch-id.c hash: use git_hash_init() consistently 2026-07-07 21:56:00 -07:00
prune-packed.c
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prune.c
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pull.c fetch: add --negotiation-include option for negotiation 2026-05-20 11:33:24 +09:00
push.c push: suggest <remote> <branch> for a slash slip 2026-06-27 19:36:43 -07:00
range-diff.c
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read-tree.c setup: stop using `the_repository` in `setup_work_tree()` 2026-05-19 19:36:24 +09:00
rebase.c reset: introduce ability to skip updating HEAD 2026-07-03 10:32:33 -07:00
receive-pack.c Merge branch 'jt/receive-pack-use-odb-transactions' 2026-07-22 10:30:53 -07:00
reflog.c
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refs.c builtin/refs: add "rename" subcommand 2026-07-06 07:45:57 -07:00
remote-ext.c
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remote-fd.c
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remote.c odb: rename `odb_has_object()` flags 2026-03-31 20:43:14 -07:00
repack.c Merge branch 'ps/odb-source-packed' 2026-07-06 15:50:21 -07:00
replace.c hex: add and use strbuf_add_oid_hex() 2026-05-14 15:59:25 +09:00
replay.c replay: allow to specify a ref with option --ref 2026-04-01 21:34:25 -07:00
repo.c setup: move prefix into repository 2026-07-07 10:49:40 -07:00
rerere.c
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reset.c environment: stop using `the_repository` in `is_bare_repository()` 2026-06-11 05:05:54 -07:00
rev-list.c pack-bitmap: allow aborting iteration of bitmapped objects 2026-07-15 07:19:16 -07:00
rev-parse.c setup: move prefix into repository 2026-07-07 10:49:40 -07:00
revert.c
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rm.c setup: stop using `the_repository` in `setup_work_tree()` 2026-05-19 19:36:24 +09:00
send-pack.c connect: use "service" enum for "name" argument 2026-05-19 15:05:46 +09:00
shortlog.c parse-options: exit 0 on -h 2026-07-07 17:48:57 -07:00
show-branch.c prio-queue: fold lazy_queue into prio_queue for automatic get+put fusion 2026-06-09 11:11:46 -07:00
show-index.c show-index: use gettext wrapping in user facing error messages 2026-01-30 08:58:12 -08:00
show-ref.c odb: rename `odb_has_object()` flags 2026-03-31 20:43:14 -07:00
sparse-checkout.c Merge branch 'ob/more-repo-config-values' 2026-06-15 07:42:00 -07:00
stash.c Merge branch 'aj/stash-patch-optimize-temporary-index' 2026-06-07 23:58:25 +09:00
stripspace.c setup: stop using `the_repository` in `setup_git_directory_gently()` 2026-05-19 19:36:24 +09:00
submodule--helper.c Merge branch 'dm/submodule-update-i-shorthand' 2026-07-22 10:30:52 -07:00
symbolic-ref.c
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tag.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
unpack-file.c odb: use size_t for object_info.sizep and the size APIs 2026-06-15 07:45:41 -07:00
unpack-objects.c Merge branch 'jt/receive-pack-use-odb-transactions' 2026-07-22 10:30:53 -07:00
update-index.c Merge branch 'jt/receive-pack-use-odb-transactions' 2026-07-22 10:30:53 -07:00
update-ref.c update-ref: handle rejections while adding updates 2026-05-05 16:34:08 +09:00
update-server-info.c
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upload-archive.c setup: stop using `the_repository` in `enter_repo()` 2026-05-19 19:36:24 +09:00
upload-pack.c setup: stop using `the_repository` in `enter_repo()` 2026-05-19 19:36:24 +09:00
url-parse.c builtin: create url-parse command 2026-05-06 09:48:28 +09:00
var.c
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verify-commit.c
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verify-pack.c
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verify-tag.c tag: support arbitrary repositories in gpg_verify_tag() 2025-12-29 22:02:53 +09:00
worktree.c worktree: fix resource leaks when branch creation fails 2026-07-05 09:12:10 -07:00
write-tree.c
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