From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-331097-1516222945-2-2493489549271305154 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='org', MailFrom='org' X-Spam-charsets: X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-usb-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1516222944; b=M4LUlDHWCwLJULgAlCU8F3JRg85BWlMUrz81O20ICal2d+C cA5Jv63W7dA9/ax0OJKSqJwjw3rzPYuPE4Ffk5OW8/oidrEEC6VuRXjDVsnflETE PaQRnXsNcCpH0rOw9Rarj3AmKL6viFusRM6sLel5Q1D7jTVObgVbIvM8m0Q3cMSP mcwOQIyw+/8n/PL2hQ/57SSGPEVv9Nn9G3CcO+Efj5pgAQ90Zv1qcBq+S7srw/S8 hot9Rld5cUg+vYfAsCTPNqAkQ/GN3szQuKV7AJlvjSy6bnbErX92gdbSFNbv/CAf djoyk/pxoevyim4QQhIj/GTf2xHB2atStVNEdzg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:sender:list-id; s=arctest; t=1516222944; bh=eSGG1UCve0K72KH/sbD36L/a3QCgQ9CKhJNrU9edizI=; b=GEoYscLuhr6k hAROsP4icRGItsr5praIxtdyPw1uFBL8BNnLlWsvatFmhgmx0By5Mzi2ZpauXGSO YrnL169cQcHkowipu5r0Z46rBAhjK5O27mX2YmD5InxwhkwOkTRB0uwXjCqOoab5 nbo1H4niVC9ufouH+SmfjLOTC23hEWyWnBcVeU9UJoRUgU5fV+fgcrgfMAmFtD0K xiAZziqLa1kZ4bJmS/V/9Ln2+jjk3gFyF3/YZP5dkFpwPC2VFyamriAI4wvNtr8j QtLo6AeE3yNspp8IqsR9beqAo6S0EPe5FR6nYrmZaqGfPABHnJC3hkYWLWgj6Myp WSlZHTlnqw== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered; 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=nSV/2DHV x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=infradead.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=infradead.org header.result=pass header_is_org_domain=yes Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered; 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=nSV/2DHV x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=infradead.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=infradead.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932173AbeAQVCU (ORCPT ); Wed, 17 Jan 2018 16:02:20 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:59103 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753597AbeAQUWh (ORCPT ); Wed, 17 Jan 2018 15:22:37 -0500 From: Matthew Wilcox 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 Subject: [PATCH v6 30/99] mm: Convert page-writeback to XArray Date: Wed, 17 Jan 2018 12:20:54 -0800 Message-Id: <20180117202203.19756-31-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180117202203.19756-1-willy@infradead.org> References: <20180117202203.19756-1-willy@infradead.org> Sender: linux-usb-owner@vger.kernel.org X-Mailing-List: linux-usb@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Matthew Wilcox Includes moving mapping_tagged() to fs.h as a static inline, and changing it to return bool. Signed-off-by: Matthew Wilcox --- include/linux/fs.h | 17 +++++++++------ mm/page-writeback.c | 62 +++++++++++++++++++---------------------------------- 2 files changed, 32 insertions(+), 47 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index e4345c13e237..c58bc3c619bf 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -470,15 +470,18 @@ struct block_device { struct mutex bd_fsfreeze_mutex; } __randomize_layout; +/* XArray tags, for tagging dirty and writeback pages in the pagecache. */ +#define PAGECACHE_TAG_DIRTY XA_TAG_0 +#define PAGECACHE_TAG_WRITEBACK XA_TAG_1 +#define PAGECACHE_TAG_TOWRITE XA_TAG_2 + /* - * Radix-tree tags, for tagging dirty and writeback pages within the pagecache - * radix trees + * Returns true if any of the pages in the mapping are marked with the tag. */ -#define PAGECACHE_TAG_DIRTY 0 -#define PAGECACHE_TAG_WRITEBACK 1 -#define PAGECACHE_TAG_TOWRITE 2 - -int mapping_tagged(struct address_space *mapping, int tag); +static inline bool mapping_tagged(struct address_space *mapping, xa_tag_t tag) +{ + return xa_tagged(&mapping->pages, tag); +} static inline void i_mmap_lock_write(struct address_space *mapping) { diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 588ce729d199..0407436a8305 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2098,33 +2098,25 @@ void __init page_writeback_init(void) * dirty pages in the file (thus it is important for this function to be quick * so that it can tag pages faster than a dirtying process can create them). */ -/* - * We tag pages in batches of WRITEBACK_TAG_BATCH to reduce xa_lock latency. - */ void tag_pages_for_writeback(struct address_space *mapping, pgoff_t start, pgoff_t end) { -#define WRITEBACK_TAG_BATCH 4096 - unsigned long tagged = 0; - struct radix_tree_iter iter; - void **slot; + XA_STATE(xas, &mapping->pages, start); + unsigned int tagged = 0; + void *page; - xa_lock_irq(&mapping->pages); - radix_tree_for_each_tagged(slot, &mapping->pages, &iter, start, - PAGECACHE_TAG_DIRTY) { - if (iter.index > end) - break; - radix_tree_iter_tag_set(&mapping->pages, &iter, - PAGECACHE_TAG_TOWRITE); - tagged++; - if ((tagged % WRITEBACK_TAG_BATCH) != 0) + xas_lock_irq(&xas); + xas_for_each_tag(&xas, page, end, PAGECACHE_TAG_DIRTY) { + xas_set_tag(&xas, PAGECACHE_TAG_TOWRITE); + if (++tagged % XA_CHECK_SCHED) continue; - slot = radix_tree_iter_resume(slot, &iter); - xa_unlock_irq(&mapping->pages); + + xas_pause(&xas); + xas_unlock_irq(&xas); cond_resched(); - xa_lock_irq(&mapping->pages); + xas_lock_irq(&xas); } - xa_unlock_irq(&mapping->pages); + xas_unlock_irq(&xas); } EXPORT_SYMBOL(tag_pages_for_writeback); @@ -2164,7 +2156,7 @@ int write_cache_pages(struct address_space *mapping, pgoff_t done_index; int cycled; int range_whole = 0; - int tag; + xa_tag_t tag; pagevec_init(&pvec); if (wbc->range_cyclic) { @@ -2445,7 +2437,7 @@ void account_page_cleaned(struct page *page, struct address_space *mapping, /* * For address_spaces which do not use buffers. Just tag the page as dirty in - * its radix tree. + * the xarray. * * This is also used when a single buffer is being dirtied: we want to set the * page dirty in that case, but not all the buffers. This is a "bottom-up" @@ -2471,7 +2463,7 @@ int __set_page_dirty_nobuffers(struct page *page) BUG_ON(page_mapping(page) != mapping); WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page)); account_page_dirtied(page, mapping); - radix_tree_tag_set(&mapping->pages, page_index(page), + __xa_set_tag(&mapping->pages, page_index(page), PAGECACHE_TAG_DIRTY); xa_unlock_irqrestore(&mapping->pages, flags); unlock_page_memcg(page); @@ -2634,13 +2626,13 @@ EXPORT_SYMBOL(__cancel_dirty_page); * Returns true if the page was previously dirty. * * This is for preparing to put the page under writeout. We leave the page - * tagged as dirty in the radix tree so that a concurrent write-for-sync + * tagged as dirty in the xarray so that a concurrent write-for-sync * can discover it via a PAGECACHE_TAG_DIRTY walk. The ->writepage * implementation will run either set_page_writeback() or set_page_dirty(), - * at which stage we bring the page's dirty flag and radix-tree dirty tag + * at which stage we bring the page's dirty flag and xarray dirty tag * back into sync. * - * This incoherency between the page's dirty flag and radix-tree tag is + * This incoherency between the page's dirty flag and xarray tag is * unfortunate, but it only exists while the page is locked. */ int clear_page_dirty_for_io(struct page *page) @@ -2721,7 +2713,7 @@ int test_clear_page_writeback(struct page *page) xa_lock_irqsave(&mapping->pages, flags); ret = TestClearPageWriteback(page); if (ret) { - radix_tree_tag_clear(&mapping->pages, page_index(page), + __xa_clear_tag(&mapping->pages, page_index(page), PAGECACHE_TAG_WRITEBACK); if (bdi_cap_account_writeback(bdi)) { struct bdi_writeback *wb = inode_to_wb(inode); @@ -2773,7 +2765,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write) on_wblist = mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK); - radix_tree_tag_set(&mapping->pages, page_index(page), + __xa_set_tag(&mapping->pages, page_index(page), PAGECACHE_TAG_WRITEBACK); if (bdi_cap_account_writeback(bdi)) inc_wb_stat(inode_to_wb(inode), WB_WRITEBACK); @@ -2787,10 +2779,10 @@ int __test_set_page_writeback(struct page *page, bool keep_write) sb_mark_inode_writeback(mapping->host); } if (!PageDirty(page)) - radix_tree_tag_clear(&mapping->pages, page_index(page), + __xa_clear_tag(&mapping->pages, page_index(page), PAGECACHE_TAG_DIRTY); if (!keep_write) - radix_tree_tag_clear(&mapping->pages, page_index(page), + __xa_clear_tag(&mapping->pages, page_index(page), PAGECACHE_TAG_TOWRITE); xa_unlock_irqrestore(&mapping->pages, flags); } else { @@ -2806,16 +2798,6 @@ int __test_set_page_writeback(struct page *page, bool keep_write) } EXPORT_SYMBOL(__test_set_page_writeback); -/* - * Return true if any of the pages in the mapping are marked with the - * passed tag. - */ -int mapping_tagged(struct address_space *mapping, int tag) -{ - return radix_tree_tagged(&mapping->pages, tag); -} -EXPORT_SYMBOL(mapping_tagged); - /** * wait_for_stable_page() - wait for writeback to finish, if necessary. * @page: The page to wait on. -- 2.15.1