On Thu, Dec 20, 2012 at 10:43:24PM +0800, zwu.kernel@xxxxxxxxx wrote:
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -37,6 +37,7 @@
> #include <linux/uio.h>
> #include <linux/atomic.h>
> #include <linux/prefetch.h>
> +#include "hot_tracking.h"
>
> /*
> * How many user pages to map in one call to get_user_pages(). This determines
> @@ -1299,6 +1300,11 @@ __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, offset,
> + iov_length(iov, nr_segs),
> + rw & WRITE);
hot_update_freqs takes an 'int rw' directly, so you should pass plain
'rw' here and do the 'rw & WRITE' check in hot_freq_data_update itself.
> +
> return do_blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
> nr_segs, get_block, end_io,
> submit_io, flags);
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -35,6 +35,7 @@
> #include <linux/buffer_head.h> /* __set_page_dirty_buffers */
> #include <linux/pagevec.h>
> #include <linux/timer.h>
> +#include <linux/hot_tracking.h>
> #include <trace/events/writeback.h>
>
> /*
> @@ -1902,13 +1903,24 @@ EXPORT_SYMBOL(generic_writepages);
> int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
> {
> int ret;
> + loff_t start = 0;
> + size_t count = 0;
>
> if (wbc->nr_to_write <= 0)
> return 0;
> +
> + start = mapping->writeback_index << PAGE_CACHE_SHIFT;
> + count = 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, start,
> + (count - wbc->nr_to_write) * PAGE_CACHE_SIZE, 1);
I think the frequencies should not be updated in case of error returned
from writepages.
> +
> return ret;
> }
>
> --- a/mm/readahead.c
> +++ b/mm/readahead.c
> @@ -138,6 +139,12 @@ static int read_pages(struct address_space *mapping, struct file *filp,
> out:
> blk_finish_plug(&plug);
>
> + /* Hot data tracking */
> + hot_update_freqs(mapping->host,
> + (loff_t)(list_entry(pages->prev, struct page, lru)->index)
> + << PAGE_CACHE_SHIFT,
> + (size_t)nr_pages * PAGE_CACHE_SIZE, 0);
same comment here
> +
> return ret;
> }
david
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