From: Derrick Stolee <stolee@gmail•com>
To: Stefan Beller <sbeller@google•com>, Jeff King <peff@peff•net>
Cc: "Martin Ågren" <martin.agren@gmail•com>,
gitgitgadget@gmail•com, git <git@vger•kernel.org>,
"Junio C Hamano" <gitster@pobox•com>,
"Derrick Stolee" <dstolee@microsoft•com>
Subject: Re: [PATCH 1/2] commit-graph: clean up leaked memory during write
Date: Wed, 3 Oct 2018 08:04:30 -0400 [thread overview]
Message-ID: <1686b309-e0af-5518-0fa5-4635b2f481b9@gmail.com> (raw)
In-Reply-To: <CAGZ79kaatUeHEGnW9HXv7Xgsj1Sf_M6hcgQ_5oVAOM85rqn34Q@mail.gmail.com>
On 10/2/2018 6:44 PM, Stefan Beller wrote:
>> My preference is to avoid them in the name of simplicity. If you're
>> using "make SANITIZE=leak test" to check for leaks, it will skip these
>> cases. If you're using valgrind, I think these may be reported as
>> "reachable". But that number already isn't useful for finding real
>> leaks, because it includes cases like the "foo" above as well as
>> program-lifetime globals.
>>
>> The only argument (IMHO) for such an UNLEAK() is that it annotates the
>> location for when somebody later changes the function to "return -1"
>> instead of dying. But if we are going to do such annotation, we may as
>> well actually call free(), which is what the "return" version will
>> ultimately have to do.
> Heh, that was part of my reasoning why we'd want to have *something*.
>
>> I'd actually be _more_ favorable to calling free() instead of UNLEAK()
>> there, but I'm still mildly negative, just because it may go stale (and
>> our leak-checking wouldn't usefully notice these cases). Anybody
>> converting that die() to a return needs to re-analyze the function for
>> what might need to be released (and that includes non-memory bits like
>> descriptors, too).
> Sounds reasonable, so then the consensus (between Martin, you and me)
> is to drop the UNLEAK.
Thanks for the discussion here. I'll drop the UNLEAK for now and think
about how to remove the die() calls from commit-graph.c in a later series.
Thanks,
-Stolee
next prev parent reply other threads:[~2018-10-03 12:04 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-02 14:58 [PATCH 0/2] Clean up leaks in commit-graph.c Derrick Stolee via GitGitGadget
2018-10-02 14:58 ` [PATCH 1/2] commit-graph: clean up leaked memory during write Derrick Stolee via GitGitGadget
2018-10-02 15:40 ` Martin Ågren
2018-10-02 17:59 ` Stefan Beller
2018-10-02 19:08 ` Martin Ågren
2018-10-02 19:44 ` Stefan Beller
2018-10-02 22:34 ` Jeff King
2018-10-02 22:44 ` Stefan Beller
2018-10-03 12:04 ` Derrick Stolee [this message]
2018-10-03 15:36 ` [PATCH 0/2] commit-graph: more leak fixes Martin Ågren
2018-10-03 15:36 ` [PATCH 1/2] commit-graph: free `struct packed_git` after closing it Martin Ågren
2018-10-03 15:36 ` [PATCH 2/2] builtin/commit-graph.c: UNLEAK variables Martin Ågren
2018-10-03 16:19 ` [PATCH 0/2] commit-graph: more leak fixes Derrick Stolee
2018-10-03 16:24 ` Martin Ågren
2018-10-02 22:37 ` [PATCH 1/2] commit-graph: clean up leaked memory during write Jeff King
2018-10-02 14:58 ` [PATCH 2/2] commit-graph: reduce initial oid allocation Derrick Stolee via GitGitGadget
2018-10-03 17:12 ` [PATCH v2 0/3] Clean up leaks in commit-graph.c Derrick Stolee via GitGitGadget
2018-10-03 17:12 ` [PATCH v2 1/3] commit-graph: clean up leaked memory during write Derrick Stolee via GitGitGadget
2018-10-03 17:12 ` [PATCH v2 2/3] builtin/commit-graph.c: UNLEAK variables Martin Ågren via GitGitGadget
2018-10-03 17:12 ` [PATCH v2 3/3] commit-graph: reduce initial oid allocation Derrick Stolee via GitGitGadget
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