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ipvs: Fix estimator kthreads preferred affinity

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The estimator kthreads' affinity are defined by sysctl overwritten
preferences and applied through a plain call to the scheduler's affinity
API.

However since the introduction of managed kthreads preferred affinity,
such a practice shortcuts the kthreads core code which eventually
overwrites the target to the default unbound affinity.

Fix this with using the appropriate kthread's API.

Fixes: d1a8919758 ("kthread: Default affine kthread to its preferred NUMA node")
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Frederic Weisbecker 2025-07-29 14:26:11 +02:00 • committed by Florian Westphal
parent 30c1d25b98
commit c0a23bbc98
3 changed files with 16 additions and 1 deletions
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13
include/net/ip_vs.h
View file

@ -1163,6 +1163,14 @@ static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
return housekeeping_cpumask(HK_TYPE_KTHREAD);
}
static inline const struct cpumask *sysctl_est_preferred_cpulist(struct netns_ipvs *ipvs)
{
if (ipvs->est_cpulist_valid)
return ipvs->sysctl_est_cpulist;
else
return NULL;
}
static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_est_nice;
@ -1270,6 +1278,11 @@ static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
return housekeeping_cpumask(HK_TYPE_KTHREAD);
}
static inline const struct cpumask *sysctl_est_preferred_cpulist(struct netns_ipvs *ipvs)
{
return NULL;
}
static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
{
return IPVS_EST_NICE;

1
kernel/kthread.c
View file

@ -893,6 +893,7 @@ out:
return ret;
}
EXPORT_SYMBOL_GPL(kthread_affine_preferred);
/*
* Re-affine kthreads according to their preferences

3
net/netfilter/ipvs/ip_vs_est.c
View file

@ -265,7 +265,8 @@ int ip_vs_est_kthread_start(struct netns_ipvs *ipvs,
}
set_user_nice(kd->task, sysctl_est_nice(ipvs));
set_cpus_allowed_ptr(kd->task, sysctl_est_cpulist(ipvs));
if (sysctl_est_preferred_cpulist(ipvs))
kthread_affine_preferred(kd->task, sysctl_est_preferred_cpulist(ipvs));
pr_info("starting estimator thread %d...\n", kd->id);
wake_up_process(kd->task);