Re: [PATCH] sched/fair: ensure tasks spreading in LLC during LB

2020-11-12 Thread Mel Gorman
On Mon, Nov 02, 2020 at 11:24:57AM +0100, Vincent Guittot wrote: > schbench shows latency increase for 95 percentile above since: > commit 0b0695f2b34a ("sched/fair: Rework load_balance()") > > Align the behavior of the load balancer with the wake up path, which tries > to select an idle CPU

Re: [PATCH] sched/fair: ensure tasks spreading in LLC during LB

2020-11-10 Thread Peter Zijlstra
On Mon, Nov 02, 2020 at 11:24:57AM +0100, Vincent Guittot wrote: > schbench shows latency increase for 95 percentile above since: > commit 0b0695f2b34a ("sched/fair: Rework load_balance()") > > Align the behavior of the load balancer with the wake up path, which tries > to select an idle CPU

Re: [PATCH] sched/fair: ensure tasks spreading in LLC during LB

2020-11-02 Thread Rik van Riel
On Mon, 2020-11-02 at 11:24 +0100, Vincent Guittot wrote: > Fixes: 0b0695f2b34a ("sched/fair: Rework load_balance()") > Reported-by: Chris Mason > Suggested-by: Rik van Riel > Signed-off-by: Vincent Guittot Tested-and-reviewed-by: Rik van Riel Thank you! -- All Rights Reversed.

[PATCH] sched/fair: ensure tasks spreading in LLC during LB

2020-11-02 Thread Vincent Guittot
schbench shows latency increase for 95 percentile above since: commit 0b0695f2b34a ("sched/fair: Rework load_balance()") Align the behavior of the load balancer with the wake up path, which tries to select an idle CPU which belongs to the LLC for a waking task. calculate_imbalance() will use