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Message-ID: <OF44433688.C06852CF-ON48257EDA.0004FFDC-48257EDA.0005C573@zte.com.cn> Date: Sat, 10 Oct 2015 09:02:24 +0800 From: pang.xunlei@....com.cn To: "Hillf Danton" <hillf.zj@...baba-inc.com> Cc: "linux-kernel" <linux-kernel@...r.kernel.org>, "'Xunlei Pang'" <pang.xunlei@...aro.org>, "Tejun Heo" <tj@...nel.org> Subject: Re: [PATCH] workqueue: Allocate the unbound pool using local node memory Hello, "Hillf Danton" <hillf.zj@...baba-inc.com> wrote 2015-10-09 PM 06:05:20: > > Re: [PATCH] workqueue: Allocate the unbound pool using local node memory > > > From: Xunlei Pang <pang.xunlei@...aro.org> > > > > Currently, get_unbound_pool() uses kzalloc() to allocate the > > worker pool. Actually, we can use the right node to do the > > allocation, achieving local memory access. > > > > This patch selects target node first, and uses kzalloc_node() > > instead. > > > > Signed-off-by: Xunlei Pang <pang.xunlei@...aro.org> > > --- > > kernel/workqueue.c | 26 ++++++++++++++------------ > > 1 file changed, 14 insertions(+), 12 deletions(-) > > > > diff --git a/kernel/workqueue.c b/kernel/workqueue.c > > index ca71582..96d3747 100644 > > --- a/kernel/workqueue.c > > +++ b/kernel/workqueue.c > > @@ -3199,6 +3199,7 @@ static struct worker_pool *get_unbound_pool > (const struct workqueue_attrs *attrs) > > u32 hash = wqattrs_hash(attrs); > > struct worker_pool *pool; > > int node; > > + int target_node = NUMA_NO_NODE; > > > > lockdep_assert_held(&wq_pool_mutex); > > > > @@ -3210,13 +3211,25 @@ static struct worker_pool > *get_unbound_pool(const struct workqueue_attrs *attrs) > > } > > } > > > > + /* if cpumask is contained inside a NUMA node, we belong to that node */ > > + if (wq_numa_enabled) { > > + for_each_node(node) { > > + if (cpumask_subset(attrs->cpumask, > > + wq_numa_possible_cpumask[node])) { > > + target_node = node; > > + break; > > + } > > + } > > + } > > + > > /* nope, create a new one */ > > - pool = kzalloc(sizeof(*pool), GFP_KERNEL); > > + pool = kzalloc_node(sizeof(*pool), GFP_KERNEL, target_node); > > What if target_node is short of pages at the moment? IIRC, the zonelist to be used contains all nodes' zones in order (otherwise __GFP_THISNODE is set)with target_node's zones having the highest priority, so it should automatically fall back to other nodes if target_node is short of pages. Regards, -Xunlei > > > if (!pool || init_worker_pool(pool) < 0) > > goto fail; > > > > lockdep_set_subclass(&pool->lock, 1); /* see put_pwq() */ > > copy_workqueue_attrs(pool->attrs, attrs); > > + pool->node = target_node; > > > > /* > > * no_numa isn't a worker_pool attribute, always clear it. See > > @@ -3224,17 +3237,6 @@ static struct worker_pool *get_unbound_pool > (const struct workqueue_attrs *attrs) > > */ > > pool->attrs->no_numa = false; > > > > - /* if cpumask is contained inside a NUMA node, we belong to that node */ > > - if (wq_numa_enabled) { > > - for_each_node(node) { > > - if (cpumask_subset(pool->attrs->cpumask, > > - wq_numa_possible_cpumask[node])) { > > - pool->node = node; > > - break; > > - } > > - } > > - } > > - > > if (worker_pool_assign_id(pool) < 0) > > goto fail; > > > > -- > > 1.9.1 > -------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail (and any attachment transmitted herewith) is privileged and confidential and is intended for the exclusive use of the addressee(s). If you are not an intended recipient, any disclosure, reproduction, distribution or other dissemination or use of the information contained is strictly prohibited. If you have received this mail in error, please delete it and notify us immediately. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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