linux - Linux 中的选择性核心转储 - 如何选择转储部分？

Question

我正在寻找一种方法来选择核心转储中包含的部分和内存区域。
我的应用程序的核心转储大小约为 30GB，其中大部分位于我在调试时甚至不需要的预分配缓冲区中(以后可以归零)。但是，由于转储太大，应用程序需要很长时间才能完成崩溃并开始恢复。
谁能想到一种方法来提前选择核心转储中的哪些段？
谢谢

Answer 1

根据core(5)手册页，您可以设置将哪些映射写入核心文件:

Since kernel 2.6.23, the Linux-specific /proc/PID/coredump_filter file can be used to control which memory segments are written to the core dump file in the event that a core dump is performed for the process with the corresponding process ID.

The value in the file is a bit mask of memory mapping types (see mmap(2)). If a bit is set in the mask, then memory mappings of the corresponding type are dumped; otherwise they are not dumped. The bits in this file have the following meanings:

       bit 0  Dump anonymous private mappings.
       bit 1  Dump anonymous shared mappings.
       bit 2  Dump file-backed private mappings.
       bit 3  Dump file-backed shared mappings.
       bit 4 (since Linux 2.6.24)
              Dump ELF headers.
       bit 5 (since Linux 2.6.28)
              Dump private huge pages.
       bit 6 (since Linux 2.6.28)
              Dump shared huge pages.

By default, the following bits are set: 0, 1, 4 (if the CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS kernel configuration option is enabled), and 5. The value of this file is displayed in hexadecimal. (The default value is thus displayed as 33.) Memory-mapped I/O pages such as frame buffer are never dumped, and virtual DSO pages are always dumped, regardless of the coredump_filter value.

...

This file is only provided if the kernel was built with the CONFIG_ELF_CORE configuration option.