Serge E. Hallyn wrote: > Implement the s390 arch-specific checkpoint/restart helpers. This Thanks for the patch. I will assume that the s390 specifics are correct... > is on top of Oren Laadan's c/r code (which so far was x86_32-only) > submitted here: http://lkml.org/lkml/2008/12/29/38, plus two more > patches by Nathan Lynch to fix some 64-bit issues (see > https://lists.linux-foundation.org/pipermail/containers/2009-January/015313.html > and > https://lists.linux-foundation.org/pipermail/containers/2009-January/015314.html > ). ckpt-v13 already has these two fixed. > > With these, I am able to checkpoint and restart simple programs as per > Oren's patch intro. While on x86 I never had to freeze a single task > to checkpoint it, on s390 I do need to. That is a prereq for consistent > snapshots (esp with multiple processes) anyway so I don't see that as > a problem. > > Oren, should we be putting a byte at the front of the format to > specify the architecture? If we add a field to 'struct cr_hdr_head', then we'll need arch-dependent code in a non-arch dependent source, to ensure that no two architectures choose the same value as an identifier. Can we not use the 'machine' string fiels in 'struct cr_hdr_head' - and then additional classification can take place in cr_read/write_head_arch() ? > > Changelog: > Jan 15: Stopped restoring ksp and vdso_base [...] > +/* > + * Notes > + * NUM_GPRS defined in <asm/ptrace.h> to be 16 > + * NUM_FPRS defined in <asm/ptrace.h> to be 16 > + * NUM_APRS defined in <asm/ptrace.h> to be 16 > + */ > +struct cr_hdr_cpu { > + psw_t psw; > + unsigned long args[1]; > + s390_fp_regs fp_regs; > + unsigned long gprs[NUM_GPRS]; > + unsigned long orig_gpr2; > + unsigned short svcnr; > + unsigned short ilc; > + unsigned int acrs[NUM_ACRS]; > + unsigned long ksp; > + unsigned long prot_addr; > + unsigned int trap_no; > + per_struct per_info; > + unsigned long ieee_instruction_pointer; > + unsigned long pfault_wait; > +}; This header file will be included from user space, e.g. by a utility to convert image format between kernel versions. For that, and for 32/64 bit compatibility (while shouldn't be an issue with s390...), please substitue: '__u64' for 'unsigned long', etc, and avoid including an entire structure as is. > + > +#endif /* __ASM_S390_CKPT_HDR__H */ [...] > */ > > +#define DEBUG 1 > + > #include <linux/version.h> > #include <linux/sched.h> > #include <linux/ptrace.h> > diff --git a/checkpoint/restart.c b/checkpoint/restart.c > index 6b4cd75..f65a63e 100644 > --- a/checkpoint/restart.c > +++ b/checkpoint/restart.c > @@ -8,6 +8,8 @@ > * distribution for more details. > */ > > +#define DEBUG 1 > + > #include <linux/version.h> > #include <linux/sched.h> > #include <linux/wait.h> > Probably unrelated ? Thanks, Oren. -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html