From: Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org
Subject: Re: [BUG] Git bisect extends bisecting range on repeated good/bad data
Date: Mon, 16 Dec 2019 16:22:52 +0300 [thread overview]
Message-ID: <7A220DC9-C654-40E9-8F04-7B9B3ED3318D@linaro.org> (raw)
In-Reply-To: <xmqq5zikkq6n.fsf@gitster-ct.c.googlers.com>
> On Dec 13, 2019, at 9:58 PM, Junio C Hamano <gitster@pobox.com> wrote:
>
> Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org> writes:
>
>> Git bisect may /extend/ bisection range on repeated good/bad data. Is this expected?
>
> It is not "repeated" that is an issue, but yes this is expected.
>
> The bisection works by finding a mid point to cut the graph into two
> pieces of roughly the same size, and the graph is defined by the
> set of good commits on the bottom (i.e. "we were told that all these
> good commits were good, so there is no point going back the history
> beyond any of them") and the single "bad" commit you gave the last.
>
> If you give 'bad' that is in the newer part of the history than the
> one that is already known to be bad, then you rewind that single
> "bad" commit, to force/allow the machinery to recompute the midpoint
> [*1*], and because the area to search would be wider when you do so,
> it is very much expected that you'd be offered to test more commits.
>
>
>
> [Footnote]
>
> *1* I said force/allow is because allowing the machinery to go back
> and recompute is a way to recover when you gave a "bad" earlier
> by mistake.
>
Hi Junio,
Thank you for the answer.
--
Maxim Kuvyrkov
https://www.linaro.org
prev parent reply other threads:[~2019-12-16 13:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 16:38 [BUG] Git bisect extends bisecting range on repeated good/bad data Maxim Kuvyrkov
2019-12-13 18:58 ` Junio C Hamano
2019-12-16 13:22 ` Maxim Kuvyrkov [this message]
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