From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v14 23/74] page cache: Convert page deletion to XArray Date: Sat, 16 Jun 2018 19:00:01 -0700 Message-ID: <20180617020052.4759-24-willy@infradead.org> References: <20180617020052.4759-1-willy@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=VdpoJRm08Fy75h+aB/tZALbxOrorEzQ33N3ElwwjXic=; b=QEeqrYX0l9t1EsYL82V+wsqFez xDbYT9w8RBNqvo6gRA/1EHkssP/yQsJx7efGLkPYY5yA2ktBYIlOCxspYGcuzgRdIOd4/d+TaQkfk LixtuqzrHQwnsTGGLD+9z29T9c4TtGwe3wG0uSg6WERHEi56wxJIN09KRQ1AQPZjK7mU=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To :MIME-Version:Content-Type:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=VdpoJRm08Fy75h+aB/tZALbxOrorEzQ33N3ElwwjXic=; b=HWY2LnCfLKP549ULVOXUa1ps36 AzhWunwTMCaOGDL0n4sUuxHpDdp0g0B8MH85+pUG2UKbsnZcA4fDMr+209PxKsSGxJnztOtQ6CMVt fC8mFGvPrb8sNBR6f9me7A7O8D2C1s8AeTmcFv/Fal/L3LtmZwDNmXxBkIBuhfaGfr8o=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=VdpoJRm08Fy75h+aB/tZALbxOrorEzQ33N3ElwwjXic=; b=Qk0kdlsh4Ep6idoSb/jl6gD1b azUsOgqA5gvnbRrfU1orJygex5AlA5CrXQUWdQxviF9d2Y3qN+o67xPYf5PWGikoKwk9yfo/Q693A /13vI3PJQlHyQB3eyGzWLHdHwmfpwboG8nnCp3omEdANd6DILTcOjieZsOng7v2OBs5rumg8cAcyL YNnpJC9WuCDYtszaivGd3bUkJJoNwcuTKow4ZmsN4fsUCJG4xypR6fWoPsyiaaZ8timQ7HoE5m5nm Zva4dhQ9e8rxmjEGR8/G+pDm7pLC0KbGRoby8zG7w141RokAX/ZqT5NpPOYEschpzgt84F2kABrcN /UEZV/e6g==; In-Reply-To: <20180617020052.4759-1-willy@infradead.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-nilfs@vger.kernel.org, Jan Kara , Jeff Layton , Jaegeuk Kim , Matthew Wilcox , linux-f2fs-devel@lists.sourceforge.net, Nicholas Piggin , Ryusuke Konishi , Lukas Czerner , Ross Zwisler , Christoph Hellwig , Goldwyn Rodrigues The code is slightly shorter and simpler. Signed-off-by: Matthew Wilcox --- mm/filemap.c | 31 +++++++++++++------------------ 1 file changed, 13 insertions(+), 18 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index 965ff68e5b8d..7cdb1d4b8117 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -111,31 +111,26 @@ * ->tasklist_lock (memory_failure, collect_procs_ao) */ -static void page_cache_tree_delete(struct address_space *mapping, +static void page_cache_delete(struct address_space *mapping, struct page *page, void *shadow) { - int i, nr; + XA_STATE(xas, &mapping->i_pages, page->index); + unsigned int nr = 1; - /* hugetlb pages are represented by one entry in the radix tree */ - nr = PageHuge(page) ? 1 : hpage_nr_pages(page); + mapping_set_update(&xas, mapping); + + /* hugetlb pages are represented by a single entry in the xarray */ + if (!PageHuge(page)) { + xas_set_order(&xas, page->index, compound_order(page)); + nr = 1U << compound_order(page); + } VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(PageTail(page), page); VM_BUG_ON_PAGE(nr != 1 && shadow, page); - for (i = 0; i < nr; i++) { - struct radix_tree_node *node; - void **slot; - - __radix_tree_lookup(&mapping->i_pages, page->index + i, - &node, &slot); - - VM_BUG_ON_PAGE(!node && nr != 1, page); - - radix_tree_clear_tags(&mapping->i_pages, node, slot); - __radix_tree_replace(&mapping->i_pages, node, slot, shadow, - workingset_lookup_update(mapping)); - } + xas_store(&xas, shadow); + xas_init_tags(&xas); page->mapping = NULL; /* Leave page->index set: truncation lookup relies upon it */ @@ -234,7 +229,7 @@ void __delete_from_page_cache(struct page *page, void *shadow) trace_mm_filemap_delete_from_page_cache(page); unaccount_page_cache_page(mapping, page); - page_cache_tree_delete(mapping, page, shadow); + page_cache_delete(mapping, page, shadow); } static void page_cache_free_page(struct address_space *mapping, -- 2.17.1 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot