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From: Junio C Hamano <gitster@pobox.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: Optimizing writes to unchanged files during merges?
Date: Fri, 13 Apr 2018 06:46:09 +0900	[thread overview]
Message-ID: <xmqq604w2j4u.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <CA+55aFzLZ3UkG5svqZwSnhNk75=fXJRkvU1m_RHBG54NOoaZPA@mail.gmail.com> (Linus Torvalds's message of "Thu, 12 Apr 2018 14:14:24 -0700")

Linus Torvalds <torvalds@linux-foundation.org> writes:

> Now, the reason it was marked as changed is that the xfs branch _had_
> in fact changed it, but the changes were already upstream and got
> merged away. But the file still got written out (with the same
> contents it had before the merge), and 'make' obviously only looks at
> modification time, so make rebuilt everything.

Thanks for a clear description of the issue.  It does sound
interesting.

  reply	other threads:[~2018-04-12 21:46 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-12 21:14 Optimizing writes to unchanged files during merges? Linus Torvalds
2018-04-12 21:46 ` Junio C Hamano [this message]
2018-04-12 23:17   ` Junio C Hamano
2018-04-12 23:35     ` Linus Torvalds
2018-04-12 23:41       ` Linus Torvalds
2018-04-12 23:55         ` Linus Torvalds
2018-04-13  0:01           ` Linus Torvalds
2018-04-13  7:02             ` Elijah Newren
2018-04-13 17:14               ` Linus Torvalds
2018-04-13 17:39                 ` Stefan Beller
2018-04-13 17:53                   ` Linus Torvalds
2018-04-13 20:04                 ` Elijah Newren
2018-04-13 22:27                   ` Junio C Hamano
2018-04-16  1:44                 ` Junio C Hamano
2018-04-16  2:03                   ` Linus Torvalds
2018-04-16 16:07                     ` Lars Schneider
2018-04-16 17:04                       ` Ævar Arnfjörð Bjarmason
2018-04-17 17:23                         ` Lars Schneider
2018-04-16 17:43                       ` Jacob Keller
2018-04-16 17:45                         ` Jacob Keller
2018-04-16 22:34                           ` Junio C Hamano
2018-04-17 17:27                           ` Lars Schneider
2018-04-17 17:43                             ` Jacob Keller
2018-04-16 17:47                       ` Phillip Wood
2018-04-16 20:09                       ` Stefan Haller
2018-04-16 22:55                     ` Elijah Newren
2018-04-16 23:03                   ` Elijah Newren
2018-04-12 23:18   ` Linus Torvalds
2018-04-13  0:01 ` Elijah Newren

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