lkml.org 
[lkml]   [2023]   [Jan]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 1/2] blk-iocost: add refcounting for iocg
Hello,

On Tue, Jan 10, 2023 at 09:39:44AM +0800, Yu Kuai wrote:
> As I tried to explain before, we can make sure blkg_free() is called
> in order, but blkg_free() from remove cgroup can concurrent with
> deactivate policy, and we can't guarantee the order of ioc_pd_free()
> that is called both from blkg_free() and blkcg_deactivate_policy().
> Hence I don't think #3 is possible.

Hahaha, sorry that I keep forgetting that. This doesn't really feel like
that important or difficult part of the problem tho. Can't it be solved by
synchronizing blkg free work item against the deactivate path with a mutex?

Thanks.

--
tejun

\
 
 \ /
  Last update: 2023-03-26 23:35    [W:0.145 / U:0.404 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site