All of lore.kernel.org
 help / color / mirror / Atom feed
From: Patrick Steinhardt <ps@pks.im>
To: git@vger.kernel.org
Cc: Miklos Vajna <vmiklos@collabora.com>
Subject: Performance regression in `git log --follow`
Date: Tue, 13 Oct 2026 15:55:01 +0200	[thread overview]
Message-ID: <as44NVKZA9C9S5ae@pks.im> (raw)

Hi,

a user on IRC reported a performance regression in linux.git:

    $ git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
    $ git -C linux log --stat --follow -- include/linux/rsc_table.h

I was able to reproduce the performance regression: while this command
takes roughly 33 seconds with Git 2.55, it takes almost 8 minutes with
Git 2.56.

I've bisected the regression to 304812ed33 (log: improve --follow
following renames for non-linear history, 2026-06-22). I don't have time
right now to debug any further, so I decided to just forward the report
to the mailing list. I've also Cc'd the original author of the above
commit.

Thanks!

Patrick

             reply	other threads:[~2026-10-13 13:55 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-13 13:55 Patrick Steinhardt [this message]
2026-10-13 21:24 ` Performance regression in `git log --follow` SZEDER Gábor

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=as44NVKZA9C9S5ae@pks.im \
    --to=ps@pks.im \
    --cc=git@vger.kernel.org \
    --cc=vmiklos@collabora.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.