Re: Which is simpler? (Was Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support.)

From: Pavel Machek
Date: Thu Feb 09 2006 - 18:32:44 EST


> > > Any changes to userspace are a fair game. OTOH kernel provides linear
> > > image to be saved to userspace, and what it uses internally should not
> > > be important to userland parts. (And Rafael did some changes in that
> > > area to make it more effective, IIRC).
> >
> > Yes. The code is now split into the part that handles the snapshot image
> > (in snapshot.c) and the part that writes/reads it to swap (in swap.c). [I'm
> > referring to recent -mm kernels.]
> >
> > The access to the snapshot image is provided via the functions
> > snapshot_write_next() and snapshot_read_next() that are called by the
> > code in swap.c and may be used by the user space tools via the
> > interface in user.c. In principle it ought to be possible to plug
> > something else instead of the code in snapshot.c without
> > breaking the rest.
> So, what is the answer then? If I submitted patches to provide the possibility
> of separating LRU pages into a separate stream of pages to be read/written,
> would it have any chance of getting merged? (Along with other patches to make
> writing a full image of memory possible).

Could we do the other stuff, first, please? Userland
LZF/encryption/progress should be easy to do, and doing that should
teach us how to cooperate.
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