On Wed, Apr 27, 2016 at 11:49:35AM -0700, Linus Torvalds wrote:
> On Wed, Apr 27, 2016 at 9:11 AM, Tejun Heo wrote:
> >
> > Unfortunately, we were missing a smp_rmb() after clearing PENDING for
> > execution, so nothing guaranteed visibility of the changes that a
> > queueing loser has made, which
On Wed, Apr 27, 2016 at 9:11 AM, Tejun Heo wrote:
>
> Unfortunately, we were missing a smp_rmb() after clearing PENDING for
> execution, so nothing guaranteed visibility of the changes that a
> queueing loser has made, which manifested as a reproducible blk-mq
> stall.
That explanation makes no s
Hello, Linus.
So, it turns out we had a silly bug in the most fundamental part of
workqueue for a very long time. AFAICS, this dates back to pre-git
era and has quite likely been there from the time workqueue was first
introduced.
A work item uses its PENDING bit to synchronize multiple queuers.
3 matches
Mail list logo
