On Mon, 2007-07-30 at 05:16 +0200, Nick Piggin wrote:

On Fri, Jul 27, 2007 at 10:30:47AM -0400, Lee Schermerhorn wrote:

quoted

On Fri, 2007-07-27 at 10:42 +0200, Nick Piggin wrote:

quoted

Hi,

Just got a bit of time to take another look at the replicated pagecache
patch. The nopage vs invalidate race and clear_page_dirty_for_io fixes
gives me more confidence in the locking now; the new ->fault API makes
MAP_SHARED write faults much more efficient; and a few bugs were found
and fixed.

More stats were added: *repl* in /proc/vmstat. Survives some kbuilding
tests...

--

Page-based NUMA pagecache replication.

<snip really big patch!>

Hi, Nick.

Glad to see you're back on this.  It's been on my list, but delayed by
other patch streams...

Yeah, thought I should keep it alive :) Patch is against 2.6.23-rc1.

D'Oh!  :-(  You could have just said "Read the subject line, Lee!"

quoted

As I mentioned to you in prior mail, I want to try to integrate this
atop my "auto/lazy migration" patches, such that when a task moves to a
new node, we remove just that task's pte ref's to page cache pages
[along with all refs to anon pages, as I do now] so that the task will
take a fault on next touch and either use an existing local copy or
replicate the page at that time.  Unfortunately, that's in the queue
behind the memoryless node patches and my stalled shared policy patches,
among other things :-(.

That's OK. It will likely be a long process to get any of this in...
As you know, replicated currently needs some of your automigration
infrastructure in order to get ptes pointing to the right places
after a task migration. I'd like to try some experiments with them on
a larger system, once you get time to update your patchset...

I'll try to make a pass this week, maybe next...

Lee

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