Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965614AbcJXSHU (ORCPT ); Mon, 24 Oct 2016 14:07:20 -0400 Received: from mga05.intel.com ([192.55.52.43]:39382 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965539AbcJXSHF (ORCPT ); Mon, 24 Oct 2016 14:07:05 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,542,1473145200"; d="scan'208";a="23452640" Subject: [net-next PATCH RFC 23/26] mm: Add support for releasing multiple instances of a page From: Alexander Duyck To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: davem@davemloft.net, brouer@redhat.com Date: Mon, 24 Oct 2016 08:06:28 -0400 Message-ID: <20161024120628.16276.48533.stgit@ahduyck-blue-test.jf.intel.com> In-Reply-To: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com> References: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1832 Lines: 52 This patch adds a function that allows us to batch free a page that has multiple references outstanding. Specifically this function can be used to drop a page being used in the page frag alloc cache. With this drivers can make use of functionality similar to the page frag alloc cache without having to do any workarounds for the fact that there is no function that frees multiple references. Cc: linux-mm@kvack.org Signed-off-by: Alexander Duyck --- include/linux/gfp.h | 2 ++ mm/page_alloc.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index f8041f9de..4175dca 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -506,6 +506,8 @@ extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, extern void free_hot_cold_page_list(struct list_head *list, bool cold); struct page_frag_cache; +extern void __page_frag_drain(struct page *page, unsigned int order, + unsigned int count); extern void *__alloc_page_frag(struct page_frag_cache *nc, unsigned int fragsz, gfp_t gfp_mask); extern void __free_page_frag(void *addr); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index ca423cc..253046a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3883,6 +3883,20 @@ static struct page *__page_frag_refill(struct page_frag_cache *nc, return page; } +void __page_frag_drain(struct page *page, unsigned int order, + unsigned int count) +{ + VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); + + if (page_ref_sub_and_test(page, count)) { + if (order == 0) + free_hot_cold_page(page, false); + else + __free_pages_ok(page, order); + } +} +EXPORT_SYMBOL(__page_frag_drain); + void *__alloc_page_frag(struct page_frag_cache *nc, unsigned int fragsz, gfp_t gfp_mask) {