From: Muchun Song <muchun.song@linux.dev>
To: Gang Li <gang.li@linux.dev>, David Hildenbrand <david@redhat.com>,
David Rientjes <rientjes@google.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
ligang.bdlg@bytedance.com
Subject: Re: [PATCH v4 3/7] padata: dispatch works on different nodes
Date: Fri, 19 Jan 2024 10:59:41 +0800 [thread overview]
Message-ID: <10f26c5c-760d-4f1b-abdc-8508971236ed@linux.dev> (raw)
In-Reply-To: <20240118123911.88833-4-gang.li@linux.dev>
On 2024/1/18 20:39, Gang Li wrote:
> 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.
>
> Signed-off-by: Gang Li <gang.li@linux.dev>
> Tested-by: David Rientjes <rientjes@google.com>
> ---
> include/linux/padata.h | 3 +++
> kernel/padata.c | 14 ++++++++++++--
> mm/mm_init.c | 1 +
> 3 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/padata.h b/include/linux/padata.h
> index 495b16b6b4d7..f79ccd50e7f4 100644
> --- a/include/linux/padata.h
> +++ b/include/linux/padata.h
> @@ -137,6 +137,8 @@ struct padata_shell {
> * appropriate for one worker thread to do at once.
> * @max_threads: Max threads to use for the job, actual number may be less
> * depending on task size and minimum chunk size.
> + * @numa_aware: Dispatch jobs to different nodes. If a node only has memory but
> + * no CPU, dispatch its jobs to a random CPU.
> */
> struct padata_mt_job {
> void (*thread_fn)(unsigned long start, unsigned long end, void *arg);
> @@ -146,6 +148,7 @@ struct padata_mt_job {
> unsigned long align;
> unsigned long min_chunk;
> int max_threads;
> + bool numa_aware;
> };
>
> /**
> diff --git a/kernel/padata.c b/kernel/padata.c
> index 179fb1518070..10eae3f59203 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 = ATOMIC_INIT(0);
last_used_nid is only used during boot time so it could be
__init_data. Otherwise, LGTM.
Reviewed-by: Muchun Song <muchun.song@linux.dev>
>
> 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);
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index 2c19f5515e36..549e76af8f82 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -2231,6 +2231,7 @@ static int __init deferred_init_memmap(void *data)
> .align = PAGES_PER_SECTION,
> .min_chunk = PAGES_PER_SECTION,
> .max_threads = max_threads,
> + .numa_aware = false,
> };
>
> padata_do_multithreaded(&job);
next prev parent reply other threads:[~2024-01-19 2:59 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-18 12:39 [RESEND PATCH v4 0/7] hugetlb: parallelize hugetlb page init on boot Gang Li
2024-01-18 12:39 ` [PATCH v4 1/7] hugetlb: code clean for hugetlb_hstate_alloc_pages Gang Li
2024-01-18 12:39 ` [PATCH v4 2/7] hugetlb: split hugetlb_hstate_alloc_pages Gang Li
2024-01-22 3:43 ` Muchun Song
2024-01-18 12:39 ` [PATCH v4 3/7] padata: dispatch works on different nodes Gang Li
2024-01-18 23:04 ` Tim Chen
2024-01-19 15:05 ` Gang Li
2024-01-19 2:59 ` Muchun Song [this message]
2024-01-19 15:04 ` Gang Li
2024-01-18 12:39 ` [PATCH v4 4/7] hugetlb: pass *next_nid_to_alloc directly to for_each_node_mask_to_alloc Gang Li
2024-01-18 23:01 ` Tim Chen
2024-01-19 2:54 ` Muchun Song
2024-01-22 6:16 ` Muchun Song
2024-01-22 9:14 ` Gang Li
2024-01-22 9:50 ` Muchun Song
2024-01-18 12:39 ` [PATCH v4 5/7] hugetlb: have CONFIG_HUGETLBFS select CONFIG_PADATA Gang Li
2024-01-18 12:39 ` [PATCH v4 6/7] hugetlb: parallelize 2M hugetlb allocation and initialization Gang Li
2024-01-22 7:10 ` Muchun Song
2024-01-22 10:12 ` Gang Li
2024-01-22 11:30 ` Muchun Song
2024-01-23 2:12 ` Gang Li
2024-01-23 3:32 ` Muchun Song
2024-01-18 12:39 ` [PATCH v4 7/7] hugetlb: parallelize 1G hugetlb initialization Gang Li
2024-01-18 14:22 ` Kefeng Wang
2024-01-19 14:45 ` Gang Li
2024-01-24 9:23 ` Muchun Song
2024-01-24 10:52 ` Gang Li
2024-01-25 2:48 ` Muchun Song
2024-01-25 3:47 ` Gang Li
2024-01-25 3:56 ` Gang Li
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