From: Joseph Myers <joseph@codesourcery.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: <libc-alpha@sourceware.org>
Subject: Re: [PATCH] malloc: Deprecate hook variables, __default_morecore, <mcheck.h>
Date: Thu, 17 Nov 2016 14:27:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.20.1611171423120.2016@digraph.polyomino.org.uk> (raw)
In-Reply-To: <1a524603-2966-df5a-edd9-8045aa256837@redhat.com>
On Thu, 17 Nov 2016, Florian Weimer wrote:
> > 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.
>
> In my experience, it is not useful at all for finding the cause of leaks
> because you only get the address of the immediate caller of malloc, which is
> often a wrapper. The address is subject to ASLR as well.
>
> Based on the comments in this thread, I'm not sure if people find mtrace
> theoretically useful, or actually use it. :)
I use it for similar purposes to the glibc testsuite use: compile code
once then possibly run it with tracing to check for leaks. (Where the
expectation is that the cause of the leak is in the code you just
added/changed that resulted in the check for leaks starting to fail.)
I'd be fine with extending the trace format to allow listing more of a
backtrace (using glibc's backtrace functions in the preloadable tracing
malloc implementation).
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2016-11-17 14:27 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
2016-11-17 13:00 ` Florian Weimer
2016-11-17 14:27 ` Joseph Myers [this message]
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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