From: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
Miscellaneous features that implement hot data tracking
and generally make the hot data functions a bit more friendly.
Signed-off-by: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
---
fs/direct-io.c | 8 ++++++++
fs/hot_tracking.h | 5 +++++
mm/filemap.c | 7 +++++++
mm/page-writeback.c | 13 +++++++++++++
mm/readahead.c | 7 +++++++
5 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index f86c720..8960024 100644
--- 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
@@ -1297,6 +1298,13 @@ __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(global_hot_tracking_info,
+ iocb->ki_filp->f_mapping->host,
+ (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/fs/hot_tracking.h b/fs/hot_tracking.h
index 37f69ee..42e0273 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -16,6 +16,11 @@
#include <linux/workqueue.h>
#include <linux/hot_tracking.h>
+/* Hot data tracking -- guard macros */
+#define TRACK_THIS_INODE(inode) \
+ ((inode->i_sb->hot_flags & MS_HOT_TRACKING) && \
+ !(inode->i_flags & S_NOHOTDATATRACK))
+
/* values for hot_freq_data flags */
#define FREQ_DATA_TYPE_INODE (1 << 0)
#define FREQ_DATA_TYPE_RANGE (1 << 1)
diff --git a/mm/filemap.c b/mm/filemap.c
index 83efee7..6b63b77 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -33,6 +33,7 @@
#include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */
#include <linux/memcontrol.h>
#include <linux/cleancache.h>
+#include <linux/hot_tracking.h>
#include "internal.h"
/*
@@ -1224,6 +1225,12 @@ readpage:
* PG_error will be set again if readpage fails.
*/
ClearPageError(page);
+
+ /* Hot data tracking */
+ hot_update_freqs(global_hot_tracking_info, 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 5ad5ce2..cf5a1c8 100644
--- 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>
/*
@@ -1895,13 +1896,25 @@ 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(global_hot_tracking_info,
+ 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..b62f1bb 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -19,6 +19,7 @@
#include <linux/pagemap.h>
#include <linux/syscalls.h>
#include <linux/file.h>
+#include <linux/hot_tracking.h>
/*
* Initialise a struct file's readahead state. Assumes that the caller has
@@ -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(global_hot_tracking_info,
+ 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
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