Re: [patch-rt v2] rtmutex: Fix lock stealing logic

2017-06-26 Thread Sebastian Andrzej Siewior
On 2017-06-23 12:07:38 [+0200], Mike Galbraith wrote: > On Fri, 2017-06-23 at 09:37 +0200, Mike Galbraith wrote: > > V2 changes: > >   - beautification (ymmv) > >   - enable lock stealing when waiter is queued Applied. > (V3 s/steal/claim) Sebastian

Re: [patch-rt v2] rtmutex: Fix lock stealing logic

2017-06-23 Thread Steven Rostedt
On Fri, 23 Jun 2017 16:07:19 +0200 Mike Galbraith wrote: > On Fri, 2017-06-23 at 09:33 -0400, Steven Rostedt wrote: > > struct task_struct *task, > > > @@ -886,20 +901,16 @@ static int __try_to_take_rt_mutex(struct > > >*/ > > > if (waiter) { > > >

Re: [patch-rt v2] rtmutex: Fix lock stealing logic

2017-06-23 Thread Mike Galbraith
On Fri, 2017-06-23 at 09:33 -0400, Steven Rostedt wrote: > struct task_struct *task, > > @@ -886,20 +901,16 @@ static int __try_to_take_rt_mutex(struct > > */ > > if (waiter) { > > /* > > -* If waiter is not the highest priority waite

Re: [patch-rt v2] rtmutex: Fix lock stealing logic

2017-06-23 Thread Steven Rostedt
On Fri, 23 Jun 2017 09:37:14 +0200 Mike Galbraith wrote: > V2 changes: >   - beautification (ymmv) >   - enable lock stealing when waiter is queued > > rtmutex: Fix lock stealing logic > > 1. When trying to acquire an rtmutex, we first try to grab it without > queueing the waiter, and explicitl

Re: [patch-rt v2] rtmutex: Fix lock stealing logic

2017-06-23 Thread Mike Galbraith
On Fri, 2017-06-23 at 09:37 +0200, Mike Galbraith wrote: > V2 changes: >   - beautification (ymmv) >   - enable lock stealing when waiter is queued (V3 s/steal/claim)

[patch-rt v2] rtmutex: Fix lock stealing logic

2017-06-23 Thread Mike Galbraith
V2 changes:   - beautification (ymmv)   - enable lock stealing when waiter is queued rtmutex: Fix lock stealing logic 1. When trying to acquire an rtmutex, we first try to grab it without queueing the waiter, and explicitly check for that initial attempt in the !waiter path of __try_to_take_rt_mu