Re: Adaptive RW locks

hi, On Mon, Jan 20, 2020 at 6:07 AM Andrew Doran wrote: > In my testing lately I've often run into a high context switch rate over RW > locks. > > The RW locks we have now are "half adaptive" so to speak. Lock waiters can > spin while the lock is write locked and the owner is running, because

Re: Changes to reduce pressure on uvm_pageqlock

hi, 2019年12月11日(水) 20:24 Andrew Doran : > On Sun, Dec 08, 2019 at 07:00:43AM -0800, Jason Thorpe wrote: > > > > On Dec 8, 2019, at 6:00 AM, Mindaugas Rasiukevicius > wrote: > > > > > > Just a small note: since vm_page::wire_count and vm_page::loan_count > are > > > kind of mutually exclusive, I

Re: fcntl(F_GETPATH) support

2019年9月16日(月) 3:43 Jason Thorpe : > > > > On Sep 15, 2019, at 11:03 AM, Christos Zoulas > wrote: > > > > I think it is quite reliable because all the file descriptors would be > recently > > opened and therefore be in the cache. One would need to DoS the cache > > cause eviction. If that turns

Re: fcntl(F_GETPATH) support

2019年9月15日(日) 9:06 Christos Zoulas : > In article <2f29ca9a-0ae1-48d3-b3f4-1556912d4...@me.com>, > Jason Thorpe wrote: > > > > > >> On Sep 14, 2019, at 2:52 PM, Kamil Rytarowski wrote: > >> > >> On 14.09.2019 23:34, Christos Zoulas wrote: > >>> Comments? > >>> > >> > >> Question. How does it

Re: x86: per-cpu tmp vas

hi, On Sat, Jan 28, 2017 at 6:42 PM, Maxime Villard wrote: > I've updated my patch. The previous one was completely wrong. However, I'm > not > going to commit it now. > > For the record: in fact, I cannot measure the performance because of two > issues > - our PMCs do not