From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesper Dangaard Brouer Subject: [PATCH 7/7] slub: initial bulk free implementation Date: Mon, 15 Jun 2015 17:52:56 +0200 Message-ID: <20150615155256.18824.42651.stgit@devil> References: <20150615155053.18824.617.stgit@devil> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, Alexander Duyck , Jesper Dangaard Brouer To: linux-mm@kvack.org, Christoph Lameter , Andrew Morton Return-path: Received: from mx1.redhat.com ([209.132.183.28]:54479 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755796AbbFOPxB (ORCPT ); Mon, 15 Jun 2015 11:53:01 -0400 In-Reply-To: <20150615155053.18824.617.stgit@devil> Sender: netdev-owner@vger.kernel.org List-ID: This implements SLUB specific kmem_cache_free_bulk(). SLUB allocator now both have bulk alloc and free implemented. Play nice and reenable local IRQs while calling slowpath. Signed-off-by: Jesper Dangaard Brouer --- mm/slub.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index 98d0e6f73ec1..cc4f870677bb 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2752,7 +2752,37 @@ EXPORT_SYMBOL(kmem_cache_free); void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p) { - __kmem_cache_free_bulk(s, size, p); + struct kmem_cache_cpu *c; + struct page *page; + int i; + + local_irq_disable(); + c = this_cpu_ptr(s->cpu_slab); + + for (i = 0; i < size; i++) { + void *object = p[i]; + + if (unlikely(!object)) + continue; // HOW ABOUT BUG_ON()??? + + page = virt_to_head_page(object); + BUG_ON(s != page->slab_cache); /* Check if valid slab page */ + + if (c->page == page) { + /* Fastpath: local CPU free */ + set_freepointer(s, object, c->freelist); + c->freelist = object; + } else { + c->tid = next_tid(c->tid); + local_irq_enable(); + /* Slowpath: overhead locked cmpxchg_double_slab */ + __slab_free(s, page, object, _RET_IP_); + local_irq_disable(); + c = this_cpu_ptr(s->cpu_slab); + } + } + c->tid = next_tid(c->tid); + local_irq_enable(); } EXPORT_SYMBOL(kmem_cache_free_bulk);