Re: [RFC&PATCH] Alternative RCU implementation

Jim Houston
2004-09-03T01:28:13Z

On Thu, 2004-09-02 at 17:20, Manfred Spraul wrote:
> Jim Houston wrote:
>
> >We add the following /proc files:
> >/proc/shield/ltmrs
> > Setting a bit limits the use of local timers on the
> > corresponding cpu.
> >
> How do you handle schedule_delayed_work_on()?
> slab uses it to drain the per-cpu caches. It's not fatal if a cpu
> doesn't drain it's caches (just some wasted memory), but it should be
> documented.

Hi Manfred,

The timer shielding migrates most of the timers to non-shielded cpus
but does keep track of timers queued with add_timer_on(). These
are polled periodically from a non-shielded cpu, and an inter-processsor
interrupt is used to force the shielded cpu to handle their expiry.

Jim Houston - Concurrent Computer Corp.