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Mon, 17 Feb 2020 18:46:30 GMT Received: from userp2030.oracle.com (userp2030.oracle.com [156.151.31.89]) by aserp3020.oracle.com with ESMTP id 2y6tekbdbv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 17 Feb 2020 18:46:30 +0000 Received: from pps.filterd (userp2030.oracle.com [127.0.0.1]) by userp2030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 01HIiAja048492 for ; Mon, 17 Feb 2020 18:46:29 GMT Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by userp2030.oracle.com with ESMTP id 2y77nma68j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Mon, 17 Feb 2020 18:46:28 +0000 Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1j3lPL-00058z-FT; Mon, 17 Feb 2020 18:46:15 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org Date: Mon, 17 Feb 2020 10:45:47 -0800 Message-Id: <20200217184613.19668-7-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200217184613.19668-1-willy@infradead.org> References: <20200217184613.19668-1-willy@infradead.org> MIME-Version: 1.0 X-PDR: PASS X-Source-IP: 198.137.202.133 X-ServerName: bombadil.infradead.org X-Proofpoint-SPF-Result: None X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9534 signatures=668685 X-Proofpoint-Spam-Details: rule=tap_spam_policies_notspam policy=tap_spam_policies score=0 impostorscore=0 bulkscore=0 malwarescore=0 clxscore=220 suspectscore=1 adultscore=0 spamscore=0 mlxlogscore=854 phishscore=0 priorityscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002170152 X-Spam: Clean X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 phishscore=0 bulkscore=0 suspectscore=1 mlxscore=0 mlxlogscore=999 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002170152 Cc: linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-mm@kvack.org, ocfs2-devel@oss.oracle.com, linux-ext4@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-btrfs@vger.kernel.org Subject: [Ocfs2-devel] [PATCH v6 05/16] mm: Put readahead pages in cache earlier X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9534 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 bulkscore=0 mlxlogscore=999 phishscore=0 mlxscore=0 malwarescore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002170153 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9534 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 impostorscore=0 adultscore=0 spamscore=0 priorityscore=1501 suspectscore=0 clxscore=1034 bulkscore=0 phishscore=0 mlxlogscore=999 lowpriorityscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002170153 From: "Matthew Wilcox (Oracle)" At allocation time, put the pages in the cache unless we're using ->readpages. Add the readahead_for_each() iterator for the benefit of the ->readpage fallback. This iterator supports huge pages, even though none of the filesystems to be converted do yet. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/pagemap.h | 24 ++++++++++++++++++++++++ mm/readahead.c | 34 +++++++++++++++++----------------- 2 files changed, 41 insertions(+), 17 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 982ecda2d4a2..3613154e79e4 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -639,8 +639,32 @@ struct readahead_control { /* private: use the readahead_* accessors instead */ pgoff_t _start; unsigned int _nr_pages; + unsigned int _batch_count; }; +static inline struct page *readahead_page(struct readahead_control *rac) +{ + struct page *page; + + if (!rac->_nr_pages) + return NULL; + + page = xa_load(&rac->mapping->i_pages, rac->_start); + VM_BUG_ON_PAGE(!PageLocked(page), page); + rac->_batch_count = hpage_nr_pages(page); + + return page; +} + +static inline void readahead_next(struct readahead_control *rac) +{ + rac->_nr_pages -= rac->_batch_count; + rac->_start += rac->_batch_count; +} + +#define readahead_for_each(rac, page) \ + for (; (page = readahead_page(rac)); readahead_next(rac)) + /* The number of pages in this readahead block */ static inline unsigned int readahead_count(struct readahead_control *rac) { diff --git a/mm/readahead.c b/mm/readahead.c index 74791b96013f..7663de534734 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -113,12 +113,11 @@ int read_cache_pages(struct address_space *mapping, struct list_head *pages, EXPORT_SYMBOL(read_cache_pages); -static void read_pages(struct readahead_control *rac, struct list_head *pages, - gfp_t gfp) +static void read_pages(struct readahead_control *rac, struct list_head *pages) { const struct address_space_operations *aops = rac->mapping->a_ops; + struct page *page; struct blk_plug plug; - unsigned page_idx; blk_start_plug(&plug); @@ -127,19 +126,13 @@ static void read_pages(struct readahead_control *rac, struct list_head *pages, readahead_count(rac)); /* Clean up the remaining pages */ put_pages_list(pages); - goto out; - } - - for (page_idx = 0; page_idx < readahead_count(rac); page_idx++) { - struct page *page = lru_to_page(pages); - list_del(&page->lru); - if (!add_to_page_cache_lru(page, rac->mapping, page->index, - gfp)) + } else { + readahead_for_each(rac, page) { aops->readpage(rac->file, page); - put_page(page); + put_page(page); + } } -out: blk_finish_plug(&plug); } @@ -159,6 +152,7 @@ void __do_page_cache_readahead(struct address_space *mapping, int page_idx; loff_t isize = i_size_read(inode); gfp_t gfp_mask = readahead_gfp_mask(mapping); + bool use_list = mapping->a_ops->readpages; struct readahead_control rac = { .mapping = mapping, .file = filp, @@ -196,8 +190,14 @@ void __do_page_cache_readahead(struct address_space *mapping, page = __page_cache_alloc(gfp_mask); if (!page) break; - page->index = offset; - list_add(&page->lru, &page_pool); + if (use_list) { + page->index = offset; + list_add(&page->lru, &page_pool); + } else if (add_to_page_cache_lru(page, mapping, offset, + gfp_mask) < 0) { + put_page(page); + goto read; + } if (page_idx == nr_to_read - lookahead_size) SetPageReadahead(page); rac._nr_pages++; @@ -205,7 +205,7 @@ void __do_page_cache_readahead(struct address_space *mapping, continue; read: if (readahead_count(&rac)) - read_pages(&rac, &page_pool, gfp_mask); + read_pages(&rac, &page_pool); rac._nr_pages = 0; rac._start = ++offset; } @@ -216,7 +216,7 @@ void __do_page_cache_readahead(struct address_space *mapping, * will then handle the error. */ if (readahead_count(&rac)) - read_pages(&rac, &page_pool, gfp_mask); + read_pages(&rac, &page_pool); BUG_ON(!list_empty(&page_pool)); }