当分配失败时，我正在使用new_handlerin C++ 尝试释放一些内存。是否可以使用地块来分析这个？我想看看处理程序实际释放了多少内存，最好在调用new_handler.
仅在进程上调用 massif 是行不通的，因为它受到与程序相同的限制：
> cat run
#!/bin/bash
ulimit -v 128000
my_program
> valgrind --tool=massif --trace-children=yes --detailed-freq=1 ./run
==7602== Massif, a heap profiler
==7602== Copyright (C) 2003-2011, and GNU GPL'd, by Nicholas Nethercote
==7602== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==7602== Command: ./run
==7602==
==7605== Massif, a heap profiler
==7605== Copyright (C) 2003-2011, and GNU GPL'd, by Nicholas Nethercote
==7605== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==7605== Command: ./my_program
==7605==
ERROR: ld.so: object '/usr/lib/valgrind/vgpreload_core-amd64-linux.so' from LD_PRELOAD cannot be preloaded: ignored.
ERROR: ld.so: object '/usr/lib/valgrind/vgpreload_massif-amd64-linux.so' from LD_PRELOAD cannot be preloaded: ignored.
[output of program snipped]
==7605==
==7605== Valgrind's memory management: out of memory:
==7605== newSuperblock's request for 4194304 bytes failed.
==7605== 122073088 bytes have already been allocated.
==7605== Valgrind cannot continue. Sorry.
==7605==
==7605== There are several possible reasons for this.
==7605== - You have some kind of memory limit in place. Look at the
==7605== output of 'ulimit -a'. Is there a limit on the size of
==7605== virtual memory or address space?
==7605== - You have run out of swap space.
==7605== - Valgrind has a bug. If you think this is the case or you are
==7605== not sure, please let us know and we'll try to fix it.
==7605== Please note that programs can take substantially more memory than
==7605== normal when running under Valgrind tools, eg. up to twice or
==7605== more, depending on the tool. On a 64-bit machine, Valgrind
==7605== should be able to make use of up 32GB memory. On a 32-bit
==7605== machine, Valgrind should be able to use all the memory available
==7605== to a single process, up to 4GB if that's how you have your
==7605== kernel configured. Most 32-bit Linux setups allow a maximum of
==7605== 3GB per process.
==7605==
==7605== Whatever the reason, Valgrind cannot continue. Sorry.
==7602==