Re: [PATCH] block: Free iovec arrays allocated by multiwrite_merge()

[Leszek Urbanski <tygrys@moo.pl>]

<20100421200358.GH24351@us.ibm.com>; from Ryan Harper on Wed, Apr 21, 2010 at 15:03:58 -0500

> > Debugging with mtrace() also pointed to the iovec code as the culprit.
> 
> I've not used mtrace before, could you dump your command invocation for
> the list?  I know other's would be glad to see an example with kvm

#include <mcheck.c>, put mtrace() and muntrace() around the code in main()
in vl.c

export MALLOC_TRACE=/some/file

then run qemu with your usual options. After powering off the guest,
run "mtrace /path/to/qemu-binary /some/file" - it's a perl script that makes
the output more human readable.

It's a little tricky, though - remember that it will see most allocations
occurring in qemu-malloc.c - it only traces explicit glibc malloc() calls.


-- 
Leszek "Tygrys" Urbanski, SCSA, SCNA
 "Unix-to-Unix Copy Program;" said PDP-1. "You will never find a more
  wretched hive of bugs and flamers. We must be cautious." -- DECWARS
     http://cygnus.moo.pl/ -- Cygnus High Altitude Balloon