While git-config(1) has several modes, those modes are not exposed with
subcommands but instead by specifying action flags like `--unset` or
`--list`. This user interface is not really in line with how our more
modern commands work, where it is a lot more customary to say e.g. `git
remote list`. Furthermore, to add to the confusion, git-config(1) also
allows the user to request modes implicitly by just specifying the
correct number of arguments. Thus, `git config foo.bar` will retrieve
the value of "foo.bar" while `git config foo.bar baz` will set it to
"baz".
Overall, this makes for a confusing interface that could really use a
makeover. It hurts discoverability of what you can do with git-config(1)
and is comparatively easy to get wrong. Converting the command to have
subcommands instead would go a long way to help address these issues.
One concern in this context is backwards compatibility. Luckily, we can
introduce subcommands without breaking backwards compatibility at all.
This is because all the implicit modes of git-config(1) require that the
first argument is a properly formatted config key. And as config keys
_must_ have a dot in their name, any value without a dot would have been
discarded by git-config(1) previous to this change. Thus, given that
none of the subcommands do have a dot, they are unambiguous.
Introduce the first such new subcommand, which is "git config list". To
retain backwards compatibility we only conditionally use subcommands and
will fall back to the old syntax in case no subcommand was detected.
This should help to transition to the new-style syntax until we
eventually deprecate and remove the old-style syntax.
Note that the way we handle this we're duplicating some functionality
across old and new syntax. While this isn't pretty, it helps us to
ensure that there really is no change in behaviour for the old syntax.
Amend tests such that we run them both with old and new style syntax.
As tests are now run twice, state from the first run may be still be
around in the second run and thus cause tests to fail. Add cleanup logic
as required to fix such tests.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
builtin/config: pull out function to handle config location
There's quite a bunch of options to git-config(1) that allow the user to
specify which config location to use when reading or writing config
options. The logic to handle this is thus by necessity also quite
involved.
Pull it out into a separate function so that we can reuse it in
subsequent commits which introduce proper subcommands.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
builtin/config: use `OPT_CMDMODE()` to specify modes
The git-config(1) command has various different modes which are
accessible via e.g. `--get-urlmatch` or `--unset-all`. These modes are
declared with `OPT_BIT()`, which causes two minor issues:
- The respective modes also have a negated form `--no-get-urlmatch`,
which is unintended.
- We have to manually handle exclusiveness of the modes.
Switch these options to instead use `OPT_CMDMODE()`, which is made
exactly for this usecase. Remove the now-unneeded check that only a
single mode is given, which is now handled by the parse-options
interface.
While at it, format optional placeholders for arguments to conform to
our style guidelines by using `[<placeholder>]`.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
builtin/config: move "fixed-value" option to correct group
The `--fixed-value` option can be used to alter how the value-pattern
parameter is interpreted for the various actions of git-config(1). But
while it is an option, it is currently listed as part of the actions
group, which is wrong.
Move the option to the "Other" group, which hosts the various options
known to git-config(1).
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
config: clarify memory ownership when preparing comment strings
The ownership of memory returned when preparing a comment string is
quite intricate: when the returned value is different than the passed
value, then the caller is responsible to free the memory. This is quite
subtle, and it's even easier to miss because the returned value is in
fact a `const char *`.
Adapt the function to always return either `NULL` or a newly allocated
string. The function is called at most once per git-config(1), so it's
not like this micro-optimization really matters. Thus, callers are now
always responsible for freeing the value.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Junio C Hamano [Thu, 25 Apr 2024 17:34:24 +0000 (10:34 -0700)]
Merge branch 'rj/add-i-leak-fix'
Leakfix.
* rj/add-i-leak-fix:
add: plug a leak on interactive_add
add-patch: plug a leak handling the '/' command
add-interactive: plug a leak in get_untracked_files
apply: plug a leak in apply_data
The "receive-pack" program (which responds to "git push") was not
converted to run "git maintenance --auto" when other codepaths that
used to run "git gc --auto" were updated, which has been corrected.
* ps/run-auto-maintenance-in-receive-pack:
builtin/receive-pack: convert to use git-maintenance(1)
run-command: introduce function to prepare auto-maintenance process
Junio C Hamano [Tue, 23 Apr 2024 22:05:56 +0000 (15:05 -0700)]
Merge branch 'pk/bisect-use-show'
When "git bisect" reports the commit it determined to be the
culprit, we used to show it in a format that does not honor common
UI tweaks, like log.date and log.decorate. The code has been
taught to use "git show" to follow more customizations.
* pk/bisect-use-show:
bisect: report the found commit with "show"
Junio C Hamano [Tue, 23 Apr 2024 18:52:41 +0000 (11:52 -0700)]
Merge branch 'mr/rerere-crash-fix'
When .git/rr-cache/ rerere database gets corrupted or rerere is fed to
work on a file with conflicted hunks resolved incompletely, the rerere
machinery got confused and segfaulted, which has been corrected.
* mr/rerere-crash-fix:
rerere: fix crashes due to unmatched opening conflict markers
Junio C Hamano [Tue, 23 Apr 2024 18:52:40 +0000 (11:52 -0700)]
Merge branch 'ps/missing-btmp-fix'
GIt 2.44 introduced a regression that makes the updated code to
barf in repositories with multi-pack index written by older
versions of Git, which has been corrected.
Junio C Hamano [Tue, 23 Apr 2024 18:52:39 +0000 (11:52 -0700)]
Merge branch 'dd/t9604-use-posix-timezones'
The cvsimport tests required that the platform understands
traditional timezone notations like CST6CDT, which has been
updated to work on those systems as long as they understand
POSIX notation with explicit tz transition dates.
* dd/t9604-use-posix-timezones:
t9604: Fix test for musl libc and new Debian
Junio C Hamano [Tue, 23 Apr 2024 18:52:39 +0000 (11:52 -0700)]
Merge branch 'rj/launch-editor-error-message'
Git writes a "waiting for your editor" message on an incomplete
line after launching an editor, and then append another error
message on the same line if the editor errors out. It now clears
the "waiting for..." line before giving the error message.
* rj/launch-editor-error-message:
launch_editor: waiting message on error
Junio C Hamano [Tue, 23 Apr 2024 18:52:37 +0000 (11:52 -0700)]
Merge branch 'ps/reftable-block-iteration-optim'
The code to iterate over reftable blocks has seen some optimization
to reduce memory allocation and deallocation.
* ps/reftable-block-iteration-optim:
reftable/block: avoid copying block iterators on seek
reftable/block: reuse `zstream` state on inflation
reftable/block: open-code call to `uncompress2()`
reftable/block: reuse uncompressed blocks
reftable/reader: iterate to next block in place
reftable/block: move ownership of block reader into `struct table_iter`
reftable/block: introduce `block_reader_release()`
reftable/block: better grouping of functions
reftable/block: merge `block_iter_seek()` and `block_reader_seek()`
reftable/block: rename `block_reader_start()`
docs: improve changelog entry for `git pack-refs --auto`
The changelog entry for the new `git pack-refs --auto` mode only says
that the new flag is useful, but doesn't really say what it does. Add
some more information.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
René Scharfe [Sun, 21 Apr 2024 12:40:28 +0000 (14:40 +0200)]
don't report vsnprintf(3) error as bug
strbuf_addf() has been reporting a negative return value of vsnprintf(3)
as a bug since f141bd804d (Handle broken vsnprintf implementations in
strbuf, 2007-11-13). Other functions copied that behavior:
However, vsnprintf(3) can legitimately return a negative value if the
formatted output would be longer than INT_MAX. Stop accusing it of
being broken and just report the fact that formatting failed.
Suggested-by: Jeff King <peff@peff.net> Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
builtin/receive-pack: convert to use git-maintenance(1)
In 850b6edefa (auto-gc: extract a reusable helper from "git fetch",
2020-05-06), we have introduced a helper function `run_auto_gc()` that
kicks off `git gc --auto`. The intent of this function was to pass down
the "--quiet" flag to git-gc(1) as required without duplicating this at
all callsites. In 7c3e9e8cfb (auto-gc: pass --quiet down from am,
commit, merge and rebase, 2020-05-06) we then converted callsites that
need to pass down this flag to use the new helper function. This has the
notable omission of git-receive-pack(1), which is the only remaining
user of `git gc --auto` that sets up the proccess manually. This is
probably because it unconditionally passes down the `--quiet` flag and
thus didn't benefit much from the new helper function.
In a95ce12430 (maintenance: replace run_auto_gc(), 2020-09-17) we then
replaced `run_auto_gc()` with `run_auto_maintenance()` which invokes
git-maintenance(1) instead of git-gc(1). This command is the modern
replacement for git-gc(1) and is both more thorough and also more
flexible because administrators can configure which tasks exactly to run
during maintenance.
But due to git-receive-pack(1) not using `run_auto_gc()` in the first
place it did not get converted to use git-maintenance(1) like we do
everywhere else now. Address this oversight and start to use the newly
introduced function `prepare_auto_maintenance()`. This will also make it
easier for us to adapt this code together with all the other callsites
that invoke auto-maintenance in the future.
This removes the last internal user of `git gc --auto`.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
run-command: introduce function to prepare auto-maintenance process
The `run_auto_maintenance()` function is responsible for spawning a new
`git maintenance run --auto` process. To do so, it sets up the `sturct
child_process` and then runs it by executing `run_command()` directly.
This is rather inflexible in case callers want to modify the child
process somewhat, e.g. to redirect stderr or stdout.
Introduce a new `prepare_auto_maintenance()` function to plug this gap.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Junio C Hamano [Tue, 16 Apr 2024 21:50:30 +0000 (14:50 -0700)]
Merge branch 'ba/osxkeychain-updates'
Update osxkeychain backend with features required for the recent
credential subsystem.
* ba/osxkeychain-updates:
osxkeychain: store new attributes
osxkeychain: erase matching passwords only
osxkeychain: erase all matching credentials
osxkeychain: replace deprecated SecKeychain API
Junio C Hamano [Tue, 16 Apr 2024 21:50:30 +0000 (14:50 -0700)]
Merge branch 'jt/reftable-geometric-compaction'
The strategy to compact multiple tables of reftables after many
operations accumulate many entries has been improved to avoid
accumulating too many tables uncollected.
* jt/reftable-geometric-compaction:
reftable/stack: use geometric table compaction
reftable/stack: add env to disable autocompaction
reftable/stack: expose option to disable auto-compaction
Adjust to an upcoming changes to GNU make that breaks our Makefiles.
* tb/make-indent-conditional-with-non-spaces:
Makefile(s): do not enforce "all indents must be done with tab"
Makefile(s): avoid recipe prefix in conditional statements
vreportf(), which is usede by error() and friends, has been taught
to give the error message printf-format string when its vsnprintf()
call fails, instead of showing nothing useful to identify the
nature of the error.
Junio C Hamano [Tue, 16 Apr 2024 21:50:27 +0000 (14:50 -0700)]
Merge branch 'jc/local-extern-shell-rules'
Document and apply workaround for a buggy version of dash that
mishandles "local var=val" construct.
* jc/local-extern-shell-rules:
t1016: local VAR="VAL" fix
t0610: local VAR="VAL" fix
t: teach lint that RHS of 'local VAR=VAL' needs to be quoted
t: local VAR="VAL" (quote ${magic-reference})
t: local VAR="VAL" (quote command substitution)
t: local VAR="VAL" (quote positional parameters)
CodingGuidelines: quote assigned value in 'local var=$val'
CodingGuidelines: describe "export VAR=VAL" rule
rerere: fix crashes due to unmatched opening conflict markers
When rerere handles a conflict with an unmatched opening conflict marker
in a file with other conflicts, it will fail create a preimage and also
fail allocate the status member of struct rerere_dir. Currently the
status member is allocated after the error handling. This will lead to a
SEGFAULT when the status member is accessed during cleanup of the failed
parse.
Additionally, in subsequent executions of rerere, after removing the
MERGE_RR.lock manually, rerere crashes for a similar reason. MERGE_RR
points to a conflict id that has no preimage, therefore the status
member is not allocated and a SEGFAULT happens when trying to check if a
preimage exists.
Solve this by making sure the status field is allocated correctly and add
tests to prevent the bug from reoccurring.
This does not fix the root cause, failing to parse stray conflict
markers, but I don't think we can do much better than recognizing it,
printing an error, and moving on gracefully.
Signed-off-by: Marcel Röthke <marcel@roethke.info> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Fix was added to work around a regression in libcURL 8.7.0 (which has
already been fixed in their tip of the tree).
* jk/libcurl-8.7-regression-workaround:
remote-curl: add Transfer-Encoding header only for older curl
INSTALL: bump libcurl version to 7.21.3
http: reset POSTFIELDSIZE when clearing curl handle
Junio C Hamano [Mon, 15 Apr 2024 21:11:43 +0000 (14:11 -0700)]
Merge branch 'gt/add-u-commit-i-pathspec-check'
"git add -u <pathspec>" and "git commit [-i] <pathspec>" did not
diagnose a pathspec element that did not match any files in certain
situations, unlike "git add <pathspec>" did.
* gt/add-u-commit-i-pathspec-check:
builtin/add: error out when passing untracked path with -u
builtin/commit: error out when passing untracked path with -i
revision: optionally record matches with pathspec elements
Junio C Hamano [Mon, 15 Apr 2024 21:11:43 +0000 (14:11 -0700)]
Merge branch 'ds/fetch-config-parse-microfix'
A config parser callback function fell through instead of returning
after recognising and processing a variable, wasting cycles, which
has been corrected.
* ds/fetch-config-parse-microfix:
fetch: return when parsing submodule.recurse
René Scharfe [Sun, 14 Apr 2024 16:47:52 +0000 (18:47 +0200)]
imap-send: increase command size limit
nfvasprintf() has a 8KB limit, but it's not relevant, as its result is
combined with other strings and added to a 1KB buffer by its caller.
That 1KB limit is not mentioned in RFC 9051, which specifies IMAP.
While 1KB is plenty for user names, passwords and mailbox names,
there's no point in limiting our commands like that. Call xstrvfmt()
instead of open-coding it and use strbuf to format the command to
send, as we need its length. Fail hard if it exceeds INT_MAX, because
socket_write() can't take more than that.
Suggested-by: Jeff King <peff@peff.net> Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Peter Krefting [Sat, 13 Apr 2024 20:14:48 +0000 (21:14 +0100)]
bisect: report the found commit with "show"
When "git bisect" finds the first bad commit and shows it to the user,
it calls "git diff-tree" to do so, whose output is meant to be stable
and deliberately ignores end-user customizations.
As the output is supposed to be consumed by humans, replace this with
a call to "git show". This command honors configuration options (such
as "log.date" and "log.mailmap") and other UI improvements (renames
are detected).
Pass some hard-coded options to "git show" to make the output similar
to the one we are replacing, such as showing a patch summary only.
Reported-by: Michael Osipov <michael.osipov@innomotics.com> Signed-off-By: Peter Krefting <peter@softwolves.pp.se> Signed-off-by: Junio C Hamano <gitster@pobox.com>
René Scharfe [Sun, 14 Apr 2024 16:47:54 +0000 (18:47 +0200)]
git-compat-util: fix NO_OPENSSL on current macOS
b195aa00c1 (git-compat-util: suppress unavoidable Apple-specific
deprecation warnings, 2014-12-16) started to define
__AVAILABILITY_MACROS_USES_AVAILABILITY in git-compat-util.h. On
current versions it is already defined (e.g. on macOS 14.4.1). Undefine
it before redefining it to avoid a compilation error.
Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
In 0fea6b73f1 (Merge branch 'tb/multi-pack-verbatim-reuse', 2024-01-12)
we have introduced multi-pack verbatim reuse of objects. This series has
introduced a new BTMP chunk, which encodes information about bitmapped
objects in the multi-pack index. Starting with dab60934e3 (pack-bitmap:
pass `bitmapped_pack` struct to pack-reuse functions, 2023-12-14) we use
this information to figure out objects which we can reuse from each of
the packfiles.
One thing that we glossed over though is backwards compatibility with
repositories that do not yet have BTMP chunks in their multi-pack index.
In that case, `nth_bitmapped_pack()` would return an error, which causes
us to emit a warning followed by another error message. These warnings
are visible to users that fetch from a repository:
While the fetch succeeds the user is left wondering what they did wrong.
Furthermore, as visible both from the warning and from the reuse stats,
pack-reuse is completely disabled in such repositories.
What is quite interesting is that this issue can even be triggered in
case `pack.allowPackReuse=single` is set, which is the default value.
One could have expected that in this case we fall back to the old logic,
which is to use the preferred packfile without consulting BTMP chunks at
all. But either we fail with the above error in case they are missing,
or we use the first pack in the multi-pack-index. The former case
disables pack-reuse altogether, whereas the latter case may result in
reusing objects from a suboptimal packfile.
Fix this issue by partially reverting the logic back to what we had
before this patch series landed. Namely, in the case where we have no
BTMP chunks or when `pack.allowPackReuse=single` are set, we use the
preferred pack instead of consulting the BTMP chunks.
Helped-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
reftable/block: avoid copying block iterators on seek
When seeking a reftable record in a block we need to position the
iterator _before_ the sought-after record so that the next call to
`block_iter_next()` would yield that record. To achieve this, the loop
that performs the linear seeks to restore the previous position once it
has found the record.
This is done by advancing two `block_iter`s: one to check whether the
next record is our sought-after record, and one that we update after
every iteration. This of course involves quite a lot of copying and also
leads to needless memory allocations.
Refactor the code to get rid of the `next` iterator and the copying this
involves. Instead, we can restore the previous offset such that the call
to `next` will return the correct record.
Next to being simpler conceptually this also leads to a nice speedup.
The following benchmark parser 10k refs out of 100k existing refs via
`git-rev-list --no-walk`:
Benchmark 1: rev-list: print many refs (HEAD~)
Time (mean ± σ): 170.2 ms ± 1.7 ms [User: 86.1 ms, System: 83.6 ms]
Range (min … max): 166.4 ms … 180.3 ms 500 runs
Benchmark 2: rev-list: print many refs (HEAD~)
Time (mean ± σ): 161.6 ms ± 1.6 ms [User: 78.1 ms, System: 83.0 ms]
Range (min … max): 158.4 ms … 172.3 ms 500 runs
Summary
rev-list: print many refs (HEAD) ran
1.05 ± 0.01 times faster than rev-list: print many refs (HEAD~)
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
reftable/block: reuse `zstream` state on inflation
When calling `inflateInit()` and `inflate()`, the zlib library will
allocate several data structures for the underlying `zstream` to keep
track of various information. Thus, when inflating repeatedly, it is
possible to optimize memory allocation patterns by reusing the `zstream`
and then calling `inflateReset()` on it to prepare it for the next chunk
of data to inflate.
This is exactly what the reftable code is doing: when iterating through
reflogs we need to potentially inflate many log blocks, but we discard
the `zstream` every single time. Instead, as we reuse the `block_reader`
for each of the blocks anyway, we can initialize the `zstream` once and
then reuse it for subsequent inflations.
Refactor the code to do so, which leads to a significant reduction in
the number of allocations. The following measurements were done when
iterating through 1 million reflog entries. Before:
HEAP SUMMARY:
in use at exit: 13,473 bytes in 122 blocks
total heap usage: 23,028 allocs, 22,906 frees, 162,813,552 bytes allocated
After:
HEAP SUMMARY:
in use at exit: 13,473 bytes in 122 blocks
total heap usage: 302 allocs, 180 frees, 88,352 bytes allocated
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The reftable format stores log blocks in a compressed format. Thus,
whenever we want to read such a block we first need to decompress it.
This is done by calling the convenience function `uncompress2()` of the
zlib library, which is a simple wrapper that manages the lifecycle of
the `zstream` structure for us.
While nice for one-off inflation of data, when iterating through reflogs
we will likely end up inflating many such log blocks. This requires us
to reallocate the state of the `zstream` every single time, which adds
up over time. It would thus be great to reuse the `zstream` instead of
discarding it after every inflation.
Open-code the call to `uncompress2()` such that we can start reusing the
`zstream` in the subsequent commit. Note that our open-coded variant is
different from `uncompress2()` in two ways:
- We do not loop around `inflate()` until we have processed all input.
As our input is limited by the maximum block size, which is 16MB, we
should not hit limits of `inflate()`.
- We use `Z_FINISH` instead of `Z_NO_FLUSH`. Quoting the `inflate()`
documentation: "inflate() should normally be called until it returns
Z_STREAM_END or an error. However if all decompression is to be
performed in a single step (a single call of inflate), the parameter
flush should be set to Z_FINISH."
Furthermore, "Z_FINISH also informs inflate to not maintain a
sliding window if the stream completes, which reduces inflate's
memory footprint."
Other than that this commit is expected to be functionally equivalent
and does not yet reuse the `zstream`.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The reftable backend stores reflog entries in a compressed format and
thus needs to uncompress blocks before one can read records from it.
For each reflog block we thus have to allocate an array that we can
decompress the block contents into. This block is being discarded
whenever the table iterator moves to the next block. Consequently, we
reallocate a new array on every block, which is quite wasteful.
Refactor the code to reuse the uncompressed block data when moving the
block reader to a new block. This significantly reduces the number of
allocations when iterating through many compressed blocks. The following
measurements are done with `git reflog list` when listing 100k reflogs.
Before:
HEAP SUMMARY:
in use at exit: 13,473 bytes in 122 blocks
total heap usage: 45,755 allocs, 45,633 frees, 254,779,456 bytes allocated
After:
HEAP SUMMARY:
in use at exit: 13,473 bytes in 122 blocks
total heap usage: 23,028 allocs, 22,906 frees, 162,813,547 bytes allocated
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The table iterator has to iterate towards the next block once it has
yielded all records of the current block. This is done by creating a new
table iterator, initializing it to the next block, releasing the old
iterator and then copying over the data.
Refactor the code to instead advance the table iterator in place. This
is simpler and unlocks some optimizations in subsequent patches. Also,
it allows us to avoid some allocations.
The following measurements show a single matching ref out of 1 million
refs. Before this change:
HEAP SUMMARY:
in use at exit: 13,603 bytes in 125 blocks
total heap usage: 7,235 allocs, 7,110 frees, 301,481 bytes allocated
After:
HEAP SUMMARY:
in use at exit: 13,603 bytes in 125 blocks
total heap usage: 315 allocs, 190 frees, 107,027 bytes allocated
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
reftable/block: move ownership of block reader into `struct table_iter`
The table iterator allows the caller to iterate through all records in a
reftable table. To do so it iterates through all blocks of the desired
type one by one, where for each block it creates a new block iterator
and yields all its entries.
One of the things that is somewhat confusing in this context is who owns
the block reader that is being used to read the blocks and pass them to
the block iterator. Intuitively, as the table iterator is responsible
for iterating through the blocks, one would assume that this iterator is
also responsible for managing the lifecycle of the reader. And while it
somewhat is, the block reader is ultimately stored inside of the block
iterator.
Refactor the code such that the block reader is instead fully managed by
the table iterator. Instead of passing the reader to the block iterator,
we now only end up passing the block data to it. Despite clearing up the
lifecycle of the reader, it will also allow for better reuse of the
reader in subsequent patches.
The following benchmark prints a single matching ref out of 1 million
refs. Before:
HEAP SUMMARY:
in use at exit: 13,603 bytes in 125 blocks
total heap usage: 6,607 allocs, 6,482 frees, 509,635 bytes allocated
After:
HEAP SUMMARY:
in use at exit: 13,603 bytes in 125 blocks
total heap usage: 7,235 allocs, 7,110 frees, 301,481 bytes allocated
Note that while there are more allocation and free calls now, the
overall number of bytes allocated is significantly lower. The number of
allocations will be reduced significantly by the next patch though.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Introduce a new function `block_reader_release()` that releases
resources acquired by the block reader. This function will be extended
in a subsequent commit.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Function definitions and declaration of `struct block_reader` and
`struct block_iter` are somewhat mixed up, making it hard to see which
functions belong together. Rearrange them.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
reftable/block: merge `block_iter_seek()` and `block_reader_seek()`
The function `block_iter_seek()` is merely a simple wrapper around
`block_reader_seek()`. Merge those two functions into a new function
`block_iter_seek_key()` that more clearly says what it is actually
doing.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
projects / thirdparty / git.git / log
