lkml.org 
[lkml]   [2013]   [Jan]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 20/24] block: RCU free request_queue
On Wed, Jan 02, 2013 at 01:48:15PM -0500, Vivek Goyal wrote:
> On Fri, Dec 28, 2012 at 12:35:42PM -0800, Tejun Heo wrote:
> > RCU free request_queue so that blkcg_gq->q can be dereferenced under
> > RCU lock. This will be used to implement hierarchical stats.
>
> Can we just take a blkg reference on ->q in blkg_alloc() and drop that
> reference in blkg_free(), instead of RCU freeing up queue.

I don't think we can invoke blk_release_queue() from RCU free contxt,
so we can't put request_queue from blkg_rcu_free(). Maybe we can go
through a work item but that's uglier.

Thanks.

--
tejun


\
 
 \ /
  Last update: 2013-01-02 22:21    [W:0.071 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site