linux-kernel - [PATCH v2 3/3] sched/fair: Remove nohz.nr_cpus and use weight of cpumask instead

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Message-ID: <20260102124744.360872-4-sshegde@linux.ibm.com>
Date: Fri,  2 Jan 2026 18:17:44 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: mingo@...nel.org, peterz@...radead.org, vincent.guittot@...aro.org
Cc: sshegde@...ux.ibm.com, linux-kernel@...r.kernel.org,
        kprateek.nayak@....com, juri.lelli@...hat.com, vschneid@...hat.com,
        tglx@...utronix.de, dietmar.eggemann@....com, anna-maria@...utronix.de,
        frederic@...nel.org, wangyang.guo@...el.com
Subject: [PATCH v2 3/3] sched/fair: Remove nohz.nr_cpus and use weight of cpumask instead

nohz.nr_cpus was observed as contended cacheline when running
enterprise workload on large systems.

Fundamental scalability challenge with nohz.idle_cpus_mask
and nohz.nr_cpus is the following:

 (1) nohz_balancer_kick() observes (reads) nohz.nr_cpus 
     (or nohz.idle_cpu_mask) and nohz.has_blocked to  see whether there's
     any nohz balancing work to do, in every scheduler tick.

 (2) nohz_balance_enter_idle() and nohz_balance_exit_idle()
     (through nohz_balancer_kick() via sched_tick()) modify (write)
     nohz.nr_cpus (and/or nohz.idle_cpu_mask) and nohz.has_blocked.

The characteristic frequencies are the following:

 (1) nohz_balancer_kick() happens at scheduler (busy)tick frequency
     on CPU(which has not gone idle). This is a relatively constant
     frequency  in the ~1 kHz range or lower.

 (2) happens at idle enter/exit frequency on every CPU that goes to idle.
     This is workload dependent, but can easily be hundreds of kHz for
     IO-bound loads and high CPU counts. Ie. can be orders of magnitude
     higher than (1), in which case a cachemiss at every invocation of (1)
     is almost inevitable. idle exit will trigger (1) on the CPU
     which is coming out of idle.

There's two types of costs from these functions:

 (A) scheduler tick cost via (1): this happens on busy CPUs too, and is
     thus a primary scalability cost. But the rate here is constant and
     typically much lower than (B), hence the absolute benefit to workload
     scalability will be lower as well.

 (B) idle cost via (2): going-to-idle and coming-from-idle costs are
     secondary concerns, because they impact power efficiency more than
     they impact scalability. But in terms of absolute cost this scales
     up with nr_cpus as well, and a much faster rate, and thus may also
     approach and negatively impact system limits like
     memory bus/fabric bandwidth.

Above mentioned fundamental scalability challenge remains true for
nohz.idle_cpus_mask even after this patch. But nr_cpus can be derived from
the mask itself. Its usage doesn't warrant a functionally correct value.
It can race, at worst an additional load balance may be attempted.

So, derive the value from the idle_cpus_mask. This helps to
save some bus bandwidth w.r.t to that nohz cacheline(approx 50%).
This in turn helps to improve enterprise workload throughput.

This theory holds true for CPUMASK_OFFSTACK=y and mostly true for
CPUMASK_OFFSTACK=n (last few bits based on NR_CPUs could be in same 
cacheline as nr_cpus)

On system with 480 CPUs, running hackbench 40 process 10000 loops
(Avg of 3 runs)
baseline:
     0.81%  hackbench          [k] nohz_balance_exit_idle
     0.21%  hackbench          [k] nohz_balancer_kick
     0.09%  swapper            [k] nohz_run_idle_balance

With patch:
     0.35%  hackbench          [k] nohz_balance_exit_idle
     0.09%  hackbench          [k] nohz_balancer_kick
     0.07%  swapper            [k] nohz_run_idle_balance

[Ingo Molnar: scalability analysis changlog]
Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
---
 kernel/sched/fair.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5ceb9126d441..805b53d9709e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7141,7 +7141,6 @@ static DEFINE_PER_CPU(cpumask_var_t, should_we_balance_tmpmask);
 
 static struct {
 	cpumask_var_t idle_cpus_mask;
-	atomic_t nr_cpus;
 	int has_blocked_load;		/* Idle CPUS has blocked load */
 	int needs_update;		/* Newly idle CPUs need their next_balance collated */
 	unsigned long next_balance;     /* in jiffy units */
@@ -12458,7 +12457,7 @@ static void nohz_balancer_kick(struct rq *rq)
 	 * None are in tickless mode and hence no need for NOHZ idle load
 	 * balancing, do stats update if its due
 	 */
-	if (unlikely(!atomic_read(&nohz.nr_cpus)))
+	if (unlikely(cpumask_empty(nohz.idle_cpus_mask)))
 		goto out;
 
 	if (rq->nr_running >= 2) {
@@ -12571,7 +12570,6 @@ void nohz_balance_exit_idle(struct rq *rq)
 
 	rq->nohz_tick_stopped = 0;
 	cpumask_clear_cpu(rq->cpu, nohz.idle_cpus_mask);
-	atomic_dec(&nohz.nr_cpus);
 
 	set_cpu_sd_state_busy(rq->cpu);
 }
@@ -12629,7 +12627,6 @@ void nohz_balance_enter_idle(int cpu)
 	rq->nohz_tick_stopped = 1;
 
 	cpumask_set_cpu(cpu, nohz.idle_cpus_mask);
-	atomic_inc(&nohz.nr_cpus);
 
 	/*
 	 * Ensures that if nohz_idle_balance() fails to observe our
-- 
2.47.3