Re: [RFC PATCH 0/5] tasklist_lock fairness issues

2013-03-09 Thread Michel Lespinasse
On Sat, Mar 9, 2013 at 10:26 AM, Oleg Nesterov wrote: > Hi Michel, > > Well. I can't say I really like this. 4/5 itself looks fine, but other > complications do not look nice, at least in the long term. Imho, imho, > I can be wrong. > > Everyone seem to agree that tasklist should die, this series

Re: [RFC PATCH 0/5] tasklist_lock fairness issues

2013-03-09 Thread Oleg Nesterov
Hi Michel, Well. I can't say I really like this. 4/5 itself looks fine, but other complications do not look nice, at least in the long term. Imho, imho, I can be wrong. Everyone seem to agree that tasklist should die, this series doesn't even try to solve the fundamental problems with this global

[RFC PATCH 0/5] tasklist_lock fairness issues

2013-03-07 Thread Michel Lespinasse
I'd like to gather comments on these patches, which apply over v3.9-rc1. I have been looking at rwlock_t fairness issues, and in particular at tasklist_lock as this is the one rwlock_t user that seems to be making it difficult to switch rwlock_t to a fair lock. This is because the tasklist_lock re