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Wed, 4 Nov 2026 10:56:30 -0500 (EST) Received: by mail (OpenSMTPD) with ESMTPSA id 21cdb70f (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Wed, 4 Nov 2026 15:56:28 +0000 (UTC) Date: Wed, 4 Nov 2026 16:56:25 +0100 From: Patrick Steinhardt To: b.murauer@posteo.de Cc: git@vger.kernel.org Subject: Re: bugreport: performance regression on git log --follow Message-ID: References: <1491d49cdb1a96698e5572d9de3ac280@posteo.de> X-Mailing-List: git@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1491d49cdb1a96698e5572d9de3ac280@posteo.de> On Wed, Nov 04, 2026 at 07:58:25AM +0000, b.murauer@posteo.de wrote: > Thank you for filling out a Git bug report! > Please answer the following questions to help us understand your issue. > > What did you do before the bug happened? (Steps to reproduce your issue) > > I ran git log --follow on a single file in a repository with about 30k > commits > and 27k tracked files: > > git log --follow --oneline -- path/to/file.ts >/dev/null > > VS Code's Timeline view runs a similar command automatically: > > git log --no-ext-diff --no-textconv --format= -z -n551 > --shortstat \ > --follow -- path/to/file.ts > > We regularly merge older maintenance branches forward into main. The > affected > file was added on main and does not exist on those branches, so many merges > have > a parent that lacks it. The following command reports 692 commits for this > file: > > git log --full-history -m --diff-filter=A --format=%h -- path/to/file.ts > | > sort -u | wc -l > > What did you expect to happen? (Expected behavior) > > I expected the command to finish in a time comparable to earlier Git > versions. > With Git 2.43 on the same history, it takes about 1 second. > > What happened instead? (Actual behavior) > > With Git 2.56, the command takes around 10 minutes. It uses one CPU core > for the whole run, with very little system time, and output appears slowly. Thanks for your report! This is a known issue which was originally reported at [1]. That thread also has some patches that are currently in review. Patrick [1]: https://lore.kernel.org/git/as44NVKZA9C9S5ae@pks.im/