From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f69.google.com (mail-pg0-f69.google.com [74.125.83.69]) by kanga.kvack.org (Postfix) with ESMTP id F039B28027B for ; Wed, 17 Jan 2018 15:23:02 -0500 (EST) Received: by mail-pg0-f69.google.com with SMTP id m3so448873pgd.20 for ; Wed, 17 Jan 2018 12:23:02 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [65.50.211.133]) by mx.google.com with ESMTPS id x13si4405513pgc.630.2018.01.17.12.23.01 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 17 Jan 2018 12:23:01 -0800 (PST) From: Matthew Wilcox Subject: [PATCH v6 80/99] blk-ioc: Convert to XArray Date: Wed, 17 Jan 2018 12:21:44 -0800 Message-Id: <20180117202203.19756-81-willy@infradead.org> In-Reply-To: <20180117202203.19756-1-willy@infradead.org> References: <20180117202203.19756-1-willy@infradead.org> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: Matthew Wilcox , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-usb@vger.kernel.org, Bjorn Andersson , Stefano Stabellini , iommu@lists.linux-foundation.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org, linux-sh@vger.kernel.org, David Howells From: Matthew Wilcox Skip converting the lock to use xa_lock; I think this code can live with the double-locking. Signed-off-by: Matthew Wilcox --- block/blk-ioc.c | 13 +++++++------ include/linux/iocontext.h | 6 +++--- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/block/blk-ioc.c b/block/blk-ioc.c index f23311e4b201..baf83c8ac503 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -68,7 +68,7 @@ static void ioc_destroy_icq(struct io_cq *icq) lockdep_assert_held(&ioc->lock); - radix_tree_delete(&ioc->icq_tree, icq->q->id); + xa_erase(&ioc->icq_array, icq->q->id); hlist_del_init(&icq->ioc_node); list_del_init(&icq->q_node); @@ -278,7 +278,7 @@ int create_task_io_context(struct task_struct *task, gfp_t gfp_flags, int node) atomic_set(&ioc->nr_tasks, 1); atomic_set(&ioc->active_ref, 1); spin_lock_init(&ioc->lock); - INIT_RADIX_TREE(&ioc->icq_tree, GFP_ATOMIC | __GFP_HIGH); + xa_init_flags(&ioc->icq_array, XA_FLAGS_LOCK_IRQ); INIT_HLIST_HEAD(&ioc->icq_list); INIT_WORK(&ioc->release_work, ioc_release_fn); @@ -363,7 +363,7 @@ struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q) if (icq && icq->q == q) goto out; - icq = radix_tree_lookup(&ioc->icq_tree, q->id); + icq = xa_load(&ioc->icq_array, q->id); if (icq && icq->q == q) rcu_assign_pointer(ioc->icq_hint, icq); /* allowed to race */ else @@ -398,7 +398,7 @@ struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, if (!icq) return NULL; - if (radix_tree_maybe_preload(gfp_mask) < 0) { + if (xa_reserve(&ioc->icq_array, q->id, gfp_mask)) { kmem_cache_free(et->icq_cache, icq); return NULL; } @@ -412,7 +412,8 @@ struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, spin_lock_irq(q->queue_lock); spin_lock(&ioc->lock); - if (likely(!radix_tree_insert(&ioc->icq_tree, q->id, icq))) { + if (likely(!xa_store(&ioc->icq_array, q->id, icq, + GFP_ATOMIC | __GFP_HIGH))) { hlist_add_head(&icq->ioc_node, &ioc->icq_list); list_add(&icq->q_node, &q->icq_list); if (et->uses_mq && et->ops.mq.init_icq) @@ -421,6 +422,7 @@ struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, et->ops.sq.elevator_init_icq_fn(icq); } else { kmem_cache_free(et->icq_cache, icq); + xa_erase(&ioc->icq_array, q->id); icq = ioc_lookup_icq(ioc, q); if (!icq) printk(KERN_ERR "cfq: icq link failed!\n"); @@ -428,7 +430,6 @@ struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, spin_unlock(&ioc->lock); spin_unlock_irq(q->queue_lock); - radix_tree_preload_end(); return icq; } diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h index dba15ca8e60b..e16224f70084 100644 --- a/include/linux/iocontext.h +++ b/include/linux/iocontext.h @@ -2,9 +2,9 @@ #ifndef IOCONTEXT_H #define IOCONTEXT_H -#include #include #include +#include enum { ICQ_EXITED = 1 << 2, @@ -56,7 +56,7 @@ enum { * - ioc->icq_list and icq->ioc_node are protected by ioc lock. * q->icq_list and icq->q_node by q lock. * - * - ioc->icq_tree and ioc->icq_hint are protected by ioc lock, while icq + * - ioc->icq_array and ioc->icq_hint are protected by ioc lock, while icq * itself is protected by q lock. However, both the indexes and icq * itself are also RCU managed and lookup can be performed holding only * the q lock. @@ -111,7 +111,7 @@ struct io_context { int nr_batch_requests; /* Number of requests left in the batch */ unsigned long last_waited; /* Time last woken after wait for request */ - struct radix_tree_root icq_tree; + struct xarray icq_array; struct io_cq __rcu *icq_hint; struct hlist_head icq_list; -- 2.15.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org