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Kexec sets up all identity mappings before booting into the new kernel, and this will cause extra memory consumption for paging structures which is quite considerable on modern machines with huge memory sizes. E.g. on a 32TB machine that is kdumping, it could waste around 128MB (around 4MB/TB) from the reserved memory after kexec sets all the identity mappings using the current 2MB page. Add to that the memory needed for the loaded kdump kernel, initramfs, etc., and it causes a kexec syscall -NOMEM failure. As a result, we had to enlarge reserved memory via "crashkernel=X" to work around this problem. This causes some trouble for distributions that use policies to evaluate the proper "crashkernel=X" value for users. So enable gbpages for kexec mappings. Signed-off-by: Xunlei Pang <xlpang@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Young <dyoung@redhat.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Yinghai Lu <yinghai@kernel.org> Cc: akpm@linux-foundation.org Cc: kexec@lists.infradead.org Link: http://lkml.kernel.org/r/1493862171-8799-2-git-send-email-xlpang@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.