Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v5

Nick Piggin
2009-06-10T08:59:46Z

On Wed, Jun 10, 2009 at 04:38:03PM +0800, Wu Fengguang wrote:
> On Wed, Jun 10, 2009 at 12:05:53AM +0800, Hugh Dickins wrote:
> > I think a much more sensible approach would be to follow the page
> > migration technique of replacing the page's ptes by a special swap-like
> > entry, then do the killing from do_swap_page() if a process actually
> > tries to access the page.
>
> We call that "late kill" and will be enabled when
> sysctl_memory_failure_early_kill=0. Its default value is 1.

What's the use of this? What are the tradeoffs, in what situations
should an admin set this sysctl one way or the other?