[lkml]   [2013]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 0/6] Optimize the cpu hotplug locking -v2
On Sat, Oct 12, 2013 at 07:06:56PM +0200, Oleg Nesterov wrote:
> it even disables irqs, so this should always imply rcu_read_lock() with
> any implementation,

Not so; I could make an RCU implementation that drives the state machine
from rcu_read_unlock(). Such an implementation doesn't need the
interrupt driven poll-state driver we currently have and could thus
subvert that assumption :-)

Then again, there's a good reason PaulMck didn't pick this

> In fact I do not even understand why getaffinity() doesn't simply
> return ->cpus_allowed, but this is off-topic.

Yeah, me neither :-(, it always surprises me. But changing it is likely
to break stuff so there we are.

 \ /
  Last update: 2013-10-14 11:21    [W:0.095 / U:17.780 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site