From: zwu.kernel@gmail.com Subject: [RFC v4+ hot_track 05/19] vfs: add hooks to enable hot tracking Date: Mon, 29 Oct 2012 12:30:47 +0800 Message-ID: <1351485061-12297-6-git-send-email-zwu.kernel@gmail.com> References: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> Cc: linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linuxram@linux.vnet.ibm.com, viro@zeniv.linux.org.uk, david@fromorbit.com, tytso@mit.edu, cmm@us.ibm.com, wuzhy@linux.vnet.ibm.com, wenqing.lz@taobao.com To: linux-fsdevel@vger.kernel.org Return-path: Received: from e31.co.us.ibm.com ([32.97.110.149]:36722 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754754Ab2J2EcI (ORCPT ); Mon, 29 Oct 2012 00:32:08 -0400 Received: from /spool/local by e31.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 28 Oct 2012 22:32:06 -0600 In-Reply-To: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: From: Zhi Yong Wu Miscellaneous features that implement hot data tracking and generally make the hot data functions a bit more friendly. Signed-off-by: Zhi Yong Wu --- fs/direct-io.c | 6 ++++++ mm/filemap.c | 6 ++++++ mm/page-writeback.c | 12 ++++++++++++ mm/readahead.c | 6 ++++++ 4 files changed, 30 insertions(+), 0 deletions(-) diff --git a/fs/direct-io.c b/fs/direct-io.c index f86c720..1d23631 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -37,6 +37,7 @@ #include #include #include +#include "hot_tracking.h" /* * How many user pages to map in one call to get_user_pages(). This determines @@ -1297,6 +1298,11 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, prefetch(bdev->bd_queue); prefetch((char *)bdev->bd_queue + SMP_CACHE_BYTES); + /* Hot data tracking */ + hot_update_freqs(inode, (u64)offset, + (u64)iov_length(iov, nr_segs), + rw & WRITE); + return do_blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, nr_segs, get_block, end_io, submit_io, flags); diff --git a/mm/filemap.c b/mm/filemap.c index 83efee7..51b2c48 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -33,6 +33,7 @@ #include /* for BUG_ON(!in_atomic()) only */ #include #include +#include #include "internal.h" /* @@ -1224,6 +1225,11 @@ readpage: * PG_error will be set again if readpage fails. */ ClearPageError(page); + + /* Hot data tracking */ + hot_update_freqs(inode, (u64)page->index << PAGE_CACHE_SHIFT, + PAGE_CACHE_SIZE, 0); + /* Start the actual read. The read will unlock the page. */ error = mapping->a_ops->readpage(filp, page); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 830893b..5220040 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -35,6 +35,7 @@ #include /* __set_page_dirty_buffers */ #include #include +#include #include /* @@ -1903,13 +1904,24 @@ EXPORT_SYMBOL(generic_writepages); int do_writepages(struct address_space *mapping, struct writeback_control *wbc) { int ret; + pgoff_t start = 0; + u64 count = 0; if (wbc->nr_to_write <= 0) return 0; + + start = mapping->writeback_index << PAGE_CACHE_SHIFT; + count = (u64)wbc->nr_to_write; + if (mapping->a_ops->writepages) ret = mapping->a_ops->writepages(mapping, wbc); else ret = generic_writepages(mapping, wbc); + + /* Hot data tracking */ + hot_update_freqs(mapping->host, (u64)start, + (count - (u64)wbc->nr_to_write) * PAGE_CACHE_SIZE, 1); + return ret; } diff --git a/mm/readahead.c b/mm/readahead.c index 7963f23..8a24f1e 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -19,6 +19,7 @@ #include #include #include +#include /* * Initialise a struct file's readahead state. Assumes that the caller has @@ -138,6 +139,11 @@ static int read_pages(struct address_space *mapping, struct file *filp, out: blk_finish_plug(&plug); + /* Hot data tracking */ + hot_update_freqs(mapping->host, (u64)(list_entry(pages->prev,\ + struct page, lru)->index) << PAGE_CACHE_SHIFT, + (u64)nr_pages * PAGE_CACHE_SIZE, 0); + return ret; } -- 1.7.6.5