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From: Pierre Habouzit <madcoder@debian.org>
To: David Kastrup <dak@gnu.org>
Cc: git@vger.kernel.org
Subject: Re: [PATCH 3/3] Rework pretty_print_commit to use strbufs instead of custom buffers.
Date: Sat, 08 Sep 2007 14:17:48 +0200	[thread overview]
Message-ID: <20070908121748.GA21864@artemis.corp> (raw)
In-Reply-To: <851wd9xt98.fsf@lola.goethe.zz>

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On Sat, Sep 08, 2007 at 11:59:31AM +0000, David Kastrup wrote:
> Pierre Habouzit <madcoder@debian.org> writes:
> 
> >   Also remove the "len" parameter, as:
> >   (1) it was used as a max boundary, and every caller used ~0u
> >   (2) we check for final NUL no matter what, so it doesn't help for speed.
> 
> That sounds like a change that makes improvement of callers impossible
> when it is found out that it leads to a performance issue.  Is it only
> the pretty-print that is affected?

  I removed the "len" argument of pretty_print_commit and all the sub
pp_* functions it uses. This argument was supposed to tell which size
the commit message you want to read to format the pretty printing.

  It leads to a lot of code that works like this:

  if (position < len || *msg) /* test if len is overflowed or if we are
                                 at the end of the string */
    break;

  This impose us to maintain the len of the message while we make the
"msg" pointer progress, and so on. And it's a limit of what to read in the
commit message.

Seeing where pretty_print_commit is used:

builtin-branch.c:			pretty_print_commit(CMIT_FMT_ONELINE, commit,
builtin-log.c:			pretty_print_commit(CMIT_FMT_ONELINE, commit,
builtin-rev-list.c:		pretty_print_commit(revs.commit_format, commit,
builtin-show-branch.c:		pretty_print_commit(CMIT_FMT_ONELINE, commit,
commit.c:void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
log-tree.c:	pretty_print_commit(opt->commit_format, commit, &msgbuf,


  I assume that the user would not be very pleased if we decide to crop
his commits logs when he uses git-log. And given that git log in the
linux repository on my laptop takes:

  2,13s user 0,06s system 99% cpu 2,213 total

when the repo is hot ... I hardly think it can ever be a performance
issue :)

  But if people disagree I can refactor a patch with the "len" argument
kept.
-- 
·O·  Pierre Habouzit
··O                                                madcoder@debian.org
OOO                                                http://www.madism.org

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  reply	other threads:[~2007-09-08 12:17 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-02 22:42 strbuf API Pierre Habouzit
2007-09-03  5:43 ` Johan Herland
2007-09-03  8:46   ` Pierre Habouzit
2007-09-04  1:52     ` Miles Bader
2007-09-04  8:47       ` strbuf new semantics, let's give it a try Pierre Habouzit
2007-09-04  8:47       ` [PATCH] Rework strbuf API and semantics Pierre Habouzit
2007-09-04 11:11         ` Johannes Schindelin
2007-09-04 11:53           ` Pierre Habouzit
2007-09-04 13:34             ` Andreas Ericsson
2007-09-04 14:01             ` Pierre Habouzit
2007-09-04 15:44               ` Johannes Schindelin
2007-09-04 16:18                 ` Pierre Habouzit
2007-09-04 17:18                   ` Wincent Colaiuta
2007-09-04 14:01             ` [PATCH] Simplify strbuf uses in fast-import.c using the proper functions Pierre Habouzit
2007-09-04 23:46               ` René Scharfe
2007-09-04 23:46               ` René Scharfe
2007-09-05  7:48                 ` Pierre Habouzit
2007-09-05  8:05                   ` Junio C Hamano
2007-09-05  8:57                     ` Pierre Habouzit
2007-09-05 19:18                       ` [PATCH] Rework strbuf API and semantics Pierre Habouzit
2007-09-05 19:18                         ` [PATCH] Simplify strbuf uses in archive-tar.c using the proper functions Pierre Habouzit
2007-09-05 19:18                           ` [PATCH] Simplify strbuf uses in fast-import.c " Pierre Habouzit
2007-09-05 19:18                             ` [PATCH] Use proper strbuf API, and also simplify cmd_data code Pierre Habouzit
2007-09-05 19:18                               ` [PATCH] Simplify write_tree using strbuf's Pierre Habouzit
2007-09-05 19:18                                 ` [PATCH] Further strbuf re-engineering Pierre Habouzit
2007-09-05 19:18                                   ` [PATCH] Eradicate yet-another-buffer implementation in buitin-rerere.c Pierre Habouzit
2007-09-05 19:18                                     ` [PATCH] More strbuf uses in cache-tree.c Pierre Habouzit
2007-09-19  8:05                                   ` [PATCH] Further strbuf re-engineering Junio C Hamano
2007-09-05 19:21                             ` [PATCH] Simplify strbuf uses in fast-import.c using the proper functions Pierre Habouzit
2007-09-19  8:06                           ` [PATCH] Simplify strbuf uses in archive-tar.c " Junio C Hamano
2007-09-19  8:36                             ` Pierre Habouzit
2007-09-06  9:31                         ` [PATCH] Rework strbuf API and semantics Junio C Hamano
2007-09-06  9:49                           ` Pierre Habouzit
2007-09-06 10:03                         ` Junio C Hamano
2007-09-06 10:22                           ` Pierre Habouzit
2007-09-04 14:01             ` [PATCH] Use proper strbuf API, and also simplify cmd_data code Pierre Habouzit
2007-09-05  4:44             ` [PATCH] Rework strbuf API and semantics Miles Bader
2007-09-04  8:48       ` [PATCH] Add strbuf_fread, use it in fast-import.c Pierre Habouzit
2007-09-03  8:32 ` strbuf API Matthieu Moy
2007-09-03  8:49   ` Pierre Habouzit
2007-09-03  9:02     ` Matthieu Moy
2007-09-03  9:18     ` Junio C Hamano
2007-09-03 11:53       ` Pierre Habouzit
2007-09-03 12:29       ` Johannes Schindelin
2007-09-06 11:20 ` strbuf new API, take 2 for inclusion Pierre Habouzit
2007-09-06 11:20   ` [PATCH 1/7] Rework strbuf API and semantics Pierre Habouzit
2007-09-06 11:20     ` [PATCH 2/7] Simplify strbuf uses in archive-tar.c using the proper functions Pierre Habouzit
2007-09-06 11:20       ` [PATCH 3/7] Use proper strbuf API, and also simplify cmd_data code Pierre Habouzit
2007-09-06 11:20         ` [PATCH 4/7] Simplify write_tree using strbuf's Pierre Habouzit
2007-09-06 11:20           ` [PATCH 5/7] Further strbuf re-engineering Pierre Habouzit
2007-09-06 11:20             ` [PATCH 6/7] Eradicate yet-another-buffer implementation in buitin-rerere.c Pierre Habouzit
2007-09-06 11:20               ` [PATCH 7/7] More strbuf uses in cache-tree.c Pierre Habouzit
2007-09-06 14:05               ` [PATCH 6/7] Eradicate yet-another-buffer implementation in buitin-rerere.c Johannes Schindelin
2007-09-06 17:17                 ` Pierre Habouzit
2007-09-06 20:16                   ` David Kastrup
2007-09-06 20:54                     ` Pierre Habouzit
2007-09-07  8:03                   ` Junio C Hamano
2007-09-07  9:02                     ` Pierre Habouzit
2007-09-06 17:59       ` [PATCH 2/7] Simplify strbuf uses in archive-tar.c using the proper functions Kristian Høgsberg
2007-09-06 18:08         ` Pierre Habouzit
2007-09-06 18:18           ` Kristian Høgsberg
2007-09-06 18:27             ` Pierre Habouzit
2007-09-06 22:54               ` René Scharfe
2007-09-06 14:09     ` [PATCH 1/7] Rework strbuf API and semantics Johannes Schindelin
2007-09-06 14:21       ` Jeff King
2007-09-06 14:44         ` David Kastrup
2007-09-06 14:50           ` Jeff King
2007-09-06 15:06             ` David Kastrup
2007-09-06 15:36               ` Jeff King
2007-09-06 15:53                 ` David Kastrup
2007-09-06 15:45               ` Johannes Sixt
2007-09-06 14:43       ` David Kastrup
2007-09-06 14:52         ` Jeff King
2007-09-06 17:49     ` Kristian Høgsberg
2007-09-06 12:58   ` strbuf new API, take 2 for inclusion Jeff King
2007-09-06 17:15     ` Pierre Habouzit
2007-09-06 17:16       ` Jeff King
2007-09-06 17:19         ` Pierre Habouzit
2007-09-08 11:53 ` Use strbufs in commit.c (pretty printing) Pierre Habouzit
2007-09-08 11:53   ` [PATCH 1/3] Add strbuf_rtrim (to remove trailing spaces) Pierre Habouzit
2007-09-08 11:53     ` [PATCH 2/3] Change semantics of interpolate to work like snprintf Pierre Habouzit
2007-09-08 11:53       ` [PATCH 3/3] Rework pretty_print_commit to use strbufs instead of custom buffers Pierre Habouzit
2007-09-08 11:59         ` David Kastrup
2007-09-08 12:17           ` Pierre Habouzit [this message]
2007-09-08 12:28           ` Pierre Habouzit
2007-09-08 18:40         ` René Scharfe
2007-09-08 18:49           ` Pierre Habouzit
2007-09-08 16:18     ` [PATCH 1/3] Add strbuf_rtrim (to remove trailing spaces) René Scharfe
2007-09-08 22:53       ` Pierre Habouzit
2007-09-08 23:44         ` Pierre Habouzit

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