Re: [RFC] a prototype checkpoint-restart using core files

[Michael Snyder <michsnyd at cisco dot com>]

Soam Vasani wrote:
> Michael Snyder wrote:
>
> > Sometimes, as Mark says, a segment hasn't been mmapped
> > in yet.  I don't yet know what to do about that.
>
>
> I think the core file doesn't have enough information for
> restoring mmap'd regions ?
>
> While dumping a checkpoint you could save /proc/pid/maps, and
> do the mmaps before restoring the rest of the state from core file.
> But I'm not sure /proc/pid/maps has enough information, the "flags"
> argument to mmap (thats the 4th one) doesn't seem to be shown there.

Well, I already use /proc/pid/maps to generate the corefile.
That's how I know which memory segments need to be saved.

And I know which ones are writeable (I don't have to save
the ones that aren't).