Re: [PATCH] sched/topology: Warn when NUMA diameter > 2

2020-11-11 Thread Peter Zijlstra
On Wed, Nov 11, 2020 at 08:43:31AM +, Mel Gorman wrote: > On Tue, Nov 10, 2020 at 06:43:00PM +, Valentin Schneider wrote: > > NUMA topologies where the shortest path between some two nodes requires > > three or more hops (i.e. diameter > 2) end up being misrepresented in the > > scheduler

Re: [PATCH] sched/topology: Warn when NUMA diameter > 2

2020-11-11 Thread Mel Gorman
On Tue, Nov 10, 2020 at 06:43:00PM +, Valentin Schneider wrote: > NUMA topologies where the shortest path between some two nodes requires > three or more hops (i.e. diameter > 2) end up being misrepresented in the > scheduler topology structures. > > This is currently detected when booting a

[PATCH] sched/topology: Warn when NUMA diameter > 2

2020-11-10 Thread Valentin Schneider
NUMA topologies where the shortest path between some two nodes requires three or more hops (i.e. diameter > 2) end up being misrepresented in the scheduler topology structures. This is currently detected when booting a kernel with CONFIG_SCHED_DEBUG=y + sched_debug on the cmdline, although this