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authorGang Li Subject: padata: dispatch works on <gang.li@linux.dev>2024-03-06 13:04:17 -0800
committerAndrew Morton <akpm@linux-foundation.org>2024-03-06 13:04:17 -0800
commiteb52286634f042432ec775077a73334603a1c6e4 (patch)
tree2156deb736cbb7f6b64e853b8441f0e5f80cc985 /kernel/padata.c
parent2e73ff236e09bd2c91c91fd5c84804503b7ea90a (diff)
Author: Gang Li padata: dispatch works on
different nodes Date: Thu, 22 Feb 2024 22:04:17 +0800 When a group of tasks that access different nodes are scheduled on the same node, they may encounter bandwidth bottlenecks and access latency. Thus, numa_aware flag is introduced here, allowing tasks to be distributed across different nodes to fully utilize the advantage of multi-node systems. Link: https://lkml.kernel.org/r/20240222140422.393911-5-gang.li@linux.dev Signed-off-by: Gang Li <ligang.bdlg@bytedance.com> Tested-by: David Rientjes <rientjes@google.com> Reviewed-by: Muchun Song <muchun.song@linux.dev> Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jane Chu <jane.chu@oracle.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/padata.c')
-rw-r--r--kernel/padata.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/kernel/padata.c b/kernel/padata.c
index 179fb1518070..e3f639ff1670 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -485,7 +485,8 @@ void __init padata_do_multithreaded(struct padata_mt_job *job)
struct padata_work my_work, *pw;
struct padata_mt_job_state ps;
LIST_HEAD(works);
- int nworks;
+ int nworks, nid;
+ static atomic_t last_used_nid __initdata;
if (job->size == 0)
return;
@@ -517,7 +518,16 @@ void __init padata_do_multithreaded(struct padata_mt_job *job)
ps.chunk_size = roundup(ps.chunk_size, job->align);
list_for_each_entry(pw, &works, pw_list)
- queue_work(system_unbound_wq, &pw->pw_work);
+ if (job->numa_aware) {
+ int old_node = atomic_read(&last_used_nid);
+
+ do {
+ nid = next_node_in(old_node, node_states[N_CPU]);
+ } while (!atomic_try_cmpxchg(&last_used_nid, &old_node, nid));
+ queue_work_node(nid, system_unbound_wq, &pw->pw_work);
+ } else {
+ queue_work(system_unbound_wq, &pw->pw_work);
+ }
/* Use the current thread, which saves starting a workqueue worker. */
padata_work_init(&my_work, padata_mt_helper, &ps, PADATA_WORK_ONSTACK);