From nobody Fri Dec 26 23:17:15 2025 Received: from out-175.mta1.migadu.com (out-175.mta1.migadu.com [95.215.58.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 182BC10A0D for ; Tue, 2 Jan 2024 13:13:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Eko96B8O" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1704201208; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0BwxzTkbv6fMj2IlVqqVSI+5ecpQCg7jHconULcXMhU=; b=Eko96B8OaBJVKkDyhD/UM2q4AYrrNykiYUCYNcfOZ1A32BsBy/zQcEdL/Y94CQ0FhNyARP ty7rzZ3ZddQ0yUhcxHQr6aLFHRTzuQy4e+fg9Mn0btG4rccV9gwgX3Wz1I1oA73vy9Mlfb eNChOv/zhRPqCB0SpDniNhAQ6XPQGOE= From: Gang Li To: David Hildenbrand , David Rientjes , Mike Kravetz , Muchun Song , Andrew Morton , Tim Chen Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, ligang.bdlg@bytedance.com, Gang Li Subject: [PATCH v3 3/7] padata: dispatch works on different nodes Date: Tue, 2 Jan 2024 21:12:45 +0800 Message-Id: <20240102131249.76622-4-gang.li@linux.dev> In-Reply-To: <20240102131249.76622-1-gang.li@linux.dev> References: <20240102131249.76622-1-gang.li@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" 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 --- include/linux/padata.h | 3 +++ kernel/padata.c | 8 ++++++-- mm/mm_init.c | 1 + 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/include/linux/padata.h b/include/linux/padata.h index 495b16b6b4d72..f79ccd50e7f40 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 memor= y 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; }; =20 /** diff --git a/kernel/padata.c b/kernel/padata.c index 179fb1518070c..1c2b3a337479e 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -485,7 +485,7 @@ void __init padata_do_multithreaded(struct padata_mt_jo= b *job) struct padata_work my_work, *pw; struct padata_mt_job_state ps; LIST_HEAD(works); - int nworks; + int nworks, nid =3D 0; =20 if (job->size =3D=3D 0) return; @@ -517,7 +517,11 @@ void __init padata_do_multithreaded(struct padata_mt_j= ob *job) ps.chunk_size =3D roundup(ps.chunk_size, job->align); =20 list_for_each_entry(pw, &works, pw_list) - queue_work(system_unbound_wq, &pw->pw_work); + if (job->numa_aware) + queue_work_node((++nid % num_node_state(N_MEMORY)), + system_unbound_wq, &pw->pw_work); + else + queue_work(system_unbound_wq, &pw->pw_work); =20 /* 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 89dc29f1e6c6f..59fcffddf65a3 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -2225,6 +2225,7 @@ static int __init deferred_init_memmap(void *data) .align =3D PAGES_PER_SECTION, .min_chunk =3D PAGES_PER_SECTION, .max_threads =3D max_threads, + .numa_aware =3D false, }; =20 padata_do_multithreaded(&job); --=20 2.20.1