Re: [PATCH 0/7] ksm: responses to NUMA review

[Hugh Dickins]

On Fri, 22 Feb 2013, Ric Mason wrote:
> On 02/21/2013 04:17 PM, Hugh Dickins wrote:
> > Here's a second KSM series, based on mmotm 2013-02-19-17-20: partly in
> > response to Mel's review feedback, partly fixes to issues that I found
> > myself in doing more review and testing.  None of the issues fixed are
> > truly show-stoppers, though I would prefer them fixed sooner than later.
> 
> Do you have any ideas ksm support page cache and tmpfs?

No.  It's only been asked as a hypothetical question: I don't know of
anyone actually needing it, and I wouldn't have time to do it myself.

It would be significantly more invasive than just dealing with anonymous
memory: with anon, we already have the infrastructure for read-only pages,
but we don't at present have any notion of read-only pagecache.

Just doing it in tmpfs?  Well, yes, that might be easier: since v3.1's
radix_tree rework, shmem/tmpfs mostly goes through its own interfaces
to pagecache, so read-only pagecache, and hence KSM, might be easier
to implement there than more generally.

Hugh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/