From: Will Newton <will.newton@gmail.com>
To: Joseph Myers <joseph@codesourcery.com>
Cc: Florian Weimer <fweimer@redhat.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH] malloc: Deprecate hook variables, __default_morecore, <mcheck.h>
Date: Wed, 16 Nov 2016 09:46:00 -0000 [thread overview]
Message-ID: <CAFbHwiRXTNKgahZXLaeB8SXHc0NoHQ4zGotAG0PUvOFMzs8j3A@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1611160134530.2244@digraph.polyomino.org.uk>
On Wed, Nov 16, 2016 at 1:36 AM, Joseph Myers <joseph@codesourcery.com> wrote:
> On Tue, 15 Nov 2016, Florian Weimer wrote:
>
>> > I don't consider valgrind suitable for replacing the uses of mtrace in the
>> > glibc testsuite (or other similar uses elsewhere for lightweight checking
>> > for leaks).
>>
>> I completely agree.
>>
>> The above is for the NEWS file, for external use. For internal use, we still
>> need a solution. (I have an mtrace-compatible interposition-based tracer
>> almost finished, but it may not make the cut for the next release, and it may
>> be superseded by DJ's work anyway.) I think we can run internal deprecation
>> at a different pace than external deprecation.
>
> Well, I think mtrace (meaning the ability to run with tracing then run the
> mtrace script to process the results, more than the functions to turn
> tracing on and off) is similarly useful externally as a lightweight system
> for tracing allocations and detecting leaks. And it is of course
> documented in the manual.
It is a useful feature to use on constrained systems to do basic
allocation tracing. The main deficiency it has is it is not
thread-safe, which makes it rather useless for many modern
applications. In an ideal world glibc malloc would support a wider
range of tracing and profiling features similar to jemalloc/tcmalloc,
e.g. thread-safe allocation tracing, pprof.
next prev parent reply other threads:[~2016-11-16 9:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-26 15:02 Florian Weimer
2016-10-26 15:55 ` Joseph Myers
2016-11-15 13:22 ` Florian Weimer
2016-11-15 15:39 ` Joseph Myers
2016-11-15 15:56 ` Florian Weimer
2016-11-16 1:37 ` Joseph Myers
2016-11-16 9:46 ` Will Newton [this message]
2016-11-17 13:00 ` Florian Weimer
2016-11-17 14:27 ` Joseph Myers
2016-11-17 14:50 ` Steve Vormwald
2016-11-17 16:08 ` Adhemerval Zanella
2016-11-18 9:13 ` Florian Weimer
2016-11-18 17:29 ` Steve Vormwald
2016-11-21 19:43 ` DJ Delorie
2016-11-22 15:12 ` Florian Weimer
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