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mm: Create/affine kswapd to its preferred node

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kswapd is dedicated to a specific node. As such it wants to be
preferrably affine to it, memory and CPUs-wise.

Use the proper kthread API to achieve that. As a bonus it takes care of
CPU-hotplug events and CPU-isolation on its behalf.

Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Frederic Weisbecker 2024-09-27 00:49:03 +02:00
parent 54880b5a2b
commit c6a566f6c1
1 changed files with 3 additions and 5 deletions
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8
mm/vmscan.c
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@ -7182,10 +7182,6 @@ static int kswapd(void *p)
unsigned int highest_zoneidx = MAX_NR_ZONES - 1;
pg_data_t *pgdat = (pg_data_t *)p;
struct task_struct *tsk = current;
const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id);
if (!cpumask_empty(cpumask))
set_cpus_allowed_ptr(tsk, cpumask);
/*
* Tell the memory management that we're a "memory allocator",
@ -7354,13 +7350,15 @@ void __meminit kswapd_run(int nid)
pgdat_kswapd_lock(pgdat);
if (!pgdat->kswapd) {
pgdat->kswapd = kthread_run(kswapd, pgdat, "kswapd%d", nid);
pgdat->kswapd = kthread_create_on_node(kswapd, pgdat, nid, "kswapd%d", nid);
if (IS_ERR(pgdat->kswapd)) {
/* failure at boot is fatal */
pr_err("Failed to start kswapd on node %d，ret=%ld\n",
nid, PTR_ERR(pgdat->kswapd));
BUG_ON(system_state < SYSTEM_RUNNING);
pgdat->kswapd = NULL;
} else {
wake_up_process(pgdat->kswapd);
}
}
pgdat_kswapd_unlock(pgdat);