069e445256
When parsing a commit, the default behavior is to stuff the original buffer into a commit_slab (which takes ownership of it). But for a tool like fsck, this isn't useful. While we may look at the buffer further as part of fsck_commit(), we'll always do so through a separate pointer; attaching the buffer to the slab doesn't help. Worse, it means we have to remember to free the commit buffer in all call paths. We do so in fsck_obj(), which covers a regular "git fsck". But with "--connectivity-only", we forget to do so in both traverse_one_object(), which covers reachable objects, and mark_unreachable_referents(), which covers unreachable ones. As a result, that mode ends up storing an uncompressed copy of every commit on the heap at once. We could teach the code paths for --connectivity-only to also free commit buffers. But there's an even easier fix: we can just turn off the save_commit_buffer flag, and then we won't attach them to the commits in the first place. This reduces the peak heap of running "git fsck --connectivity-only" in a clone of linux.git from ~2GB to ~1GB. According to massif, the remaining memory goes where you'd expect: the object structs themselves, the obj_hash containing them, and the delta base cache. Note that we'll leave the call to free commit buffers in fsck_obj() for now; it's not quite redundant because of a related bug that we'll fix in a subsequent commit. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Git - fast, scalable, distributed revision control system
Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.
Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.
Please read the file INSTALL for installation instructions.
Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.
See Documentation/gittutorial.txt to get started, then see
Documentation/giteveryday.txt for a useful minimum set of commands, and
Documentation/git-<commandname>.txt for documentation of each command.
If git has been correctly installed, then the tutorial can also be
read with man gittutorial or git help tutorial, and the
documentation of each command with man git-<commandname> or git help <commandname>.
CVS users may also want to read Documentation/gitcvs-migration.txt
(man gitcvs-migration or git help cvs-migration if git is
installed).
The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission and Documentation/CodingGuidelines).
Those wishing to help with error message, usage and informational message
string translations (localization l10) should see po/README.md
(a po file is a Portable Object file that holds the translations).
To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org (not the Git list). The mailing list archives are available at https://lore.kernel.org/git/, http://marc.info/?l=git and other archival sites.
Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.
The maintainer frequently sends the "What's cooking" reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.
The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):
- random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
- stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
- "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
- "goddamn idiotic truckload of sh*t": when it breaks