[lkml]   [2023]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 0/2] vhost: improve livepatch switching for heavily loaded vhost worker kthreads
On Thu, Jan 26, 2023 at 03:12:35PM -0600, Seth Forshee (DigitalOcean) wrote:
> On Thu, Jan 26, 2023 at 06:03:16PM +0100, Petr Mladek wrote:
> > On Fri 2023-01-20 16:12:20, Seth Forshee (DigitalOcean) wrote:
> > > We've fairly regularaly seen liveptches which cannot transition within kpatch's
> > > timeout period due to busy vhost worker kthreads.
> >
> > I have missed this detail. Miroslav told me that we have solved
> > something similar some time ago, see
> >
> Interesting thread. I had thought about something along the lines of the
> original patch, but there are some ideas in there that I hadn't
> considered.

Here's another idea, have we considered this? Have livepatch set
TIF_NEED_RESCHED on all kthreads to force them into schedule(), and then
have the scheduler call klp_try_switch_task() if TIF_PATCH_PENDING is

Not sure how scheduler folks would feel about that ;-)


 \ /
  Last update: 2023-03-26 23:57    [W:0.115 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site