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Date: Tue, 14 May 2013 08:59:40 +0800
From: zwu.kernel@...il.com
To: viro@...iv.linux.org.uk
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-btrfs@...r.kernel.org, sekharan@...ibm.com,
linuxram@...ibm.com, david@...morbit.com, dsterba@...e.cz,
gregkh@...uxfoundation.org, paulmck@...ux.vnet.ibm.com,
chris.mason@...ionio.com, Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: [PATCH v2 08/12] VFS hot tracking: add one ioctl interface
From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
FS_IOC_GET_HEAT_INFO: return a struct containing the various
metrics collected in hot_freq_data structs, and also return a
calculated data temperature based on those metrics. Optionally,
retrieve the temperature from the hot data hash list instead of
recalculating it.
Signed-off-by: Chandra Seetharaman <sekharan@...ibm.com>
Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
---
fs/compat_ioctl.c | 5 ++++
fs/hot_tracking.c | 2 +-
fs/ioctl.c | 70 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/hot_tracking.h | 21 +++++++++++++
4 files changed, 97 insertions(+), 1 deletion(-)
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 996cdc5..97bf972 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -57,6 +57,7 @@
#include <linux/i2c-dev.h>
#include <linux/atalk.h>
#include <linux/gfp.h>
+#include <linux/hot_tracking.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci.h>
@@ -1402,6 +1403,9 @@ COMPATIBLE_IOCTL(TIOCSTART)
COMPATIBLE_IOCTL(TIOCSTOP)
#endif
+/*Hot data tracking*/
+COMPATIBLE_IOCTL(FS_IOC_GET_HEAT_INFO)
+
/* fat 'r' ioctls. These are handled by fat with ->compat_ioctl,
but we don't want warnings on other file systems. So declare
them as compatible here. */
@@ -1581,6 +1585,7 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
case FIBMAP:
case FIGETBSZ:
case FIONREAD:
+ case FS_IOC_GET_HEAT_INFO:
if (S_ISREG(file_inode(f.file)->i_mode))
break;
/*FALL THROUGH*/
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index cea3675..1618f21 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -375,7 +375,7 @@ static void hot_freq_update(struct hot_info *root,
* the *_COEFF_POWER values and combined to a single temperature
* value.
*/
-static u32 hot_temp_calc(struct hot_comm_item *ci)
+u32 hot_temp_calc(struct hot_comm_item *ci)
{
u32 result = 0;
struct hot_freq_data *freq_data = &ci->hot_freq_data;
diff --git a/fs/ioctl.c b/fs/ioctl.c
index fd507fb..f9f3497 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -15,6 +15,7 @@
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <linux/falloc.h>
+#include <linux/hot_tracking.h>
#include <asm/ioctls.h>
@@ -537,6 +538,72 @@ static int ioctl_fsthaw(struct file *filp)
}
/*
+ * Retrieve information about access frequency for the given file. Return it in
+ * a userspace-friendly struct for btrfsctl (or another tool) to parse.
+ *
+ * The temperature that is returned can be "live" -- that is, recalculated when
+ * the ioctl is called -- or it can be returned from the map list, reflecting
+ * the (possibly old) value that the system will use when considering files
+ * for migration. This behavior is determined by hot_heat_info->live.
+ */
+static int ioctl_heat_info(struct file *file, void __user *argp)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ struct hot_heat_info heat_info;
+ struct hot_inode_item *he;
+ int ret = 0;
+
+ if (copy_from_user((void *)&heat_info,
+ argp,
+ sizeof(struct hot_heat_info)) != 0) {
+ ret = -EFAULT;
+ goto err;
+ }
+
+ he = hot_inode_item_lookup(inode->i_sb->s_hot_root, inode->i_ino, 0);
+ if (IS_ERR(he)) {
+ /* we don't have any info on this file yet */
+ ret = -ENODATA;
+ goto err;
+ }
+
+ heat_info.avg_delta_reads =
+ (__u64) he->hot_inode.hot_freq_data.avg_delta_reads;
+ heat_info.avg_delta_writes =
+ (__u64) he->hot_inode.hot_freq_data.avg_delta_writes;
+ heat_info.last_read_time =
+ (__u64) timespec_to_ns(&he->hot_inode.hot_freq_data.last_read_time);
+ heat_info.last_write_time =
+ (__u64) timespec_to_ns(&he->hot_inode.hot_freq_data.last_write_time);
+ heat_info.num_reads =
+ (__u32) he->hot_inode.hot_freq_data.nr_reads;
+ heat_info.num_writes =
+ (__u32) he->hot_inode.hot_freq_data.nr_writes;
+
+ if (heat_info.live > 0) {
+ /*
+ * got a request for live temperature,
+ * call hot_calc_temp() to recalculate
+ */
+ heat_info.temp = hot_temp_calc(&he->hot_inode);
+ } else {
+ /* not live temperature, get it from the map list */
+ heat_info.temp = he->hot_inode.hot_freq_data.last_temp;
+ }
+
+ hot_comm_item_put(&he->hot_inode);
+
+ if (copy_to_user(argp, (void *)&heat_info,
+ sizeof(struct hot_heat_info))) {
+ ret = -EFAULT;
+ goto err;
+ }
+
+err:
+ return ret;
+}
+
+/*
* When you add any new common ioctls to the switches above and below
* please update compat_sys_ioctl() too.
*
@@ -591,6 +658,9 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
case FIGETBSZ:
return put_user(inode->i_sb->s_blocksize, argp);
+ case FS_IOC_GET_HEAT_INFO:
+ return ioctl_heat_info(filp, argp);
+
default:
if (S_ISREG(inode->i_mode))
error = file_ioctl(filp, cmd, arg);
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index 63baae3..263a15e 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -17,6 +17,18 @@
#include <linux/types.h>
+struct hot_heat_info {
+ __u64 avg_delta_reads;
+ __u64 avg_delta_writes;
+ __u64 last_read_time;
+ __u64 last_write_time;
+ __u32 num_reads;
+ __u32 num_writes;
+ __u32 temp;
+ __u8 live;
+ __u8 resv[3];
+};
+
#ifdef __KERNEL__
#include <linux/rbtree.h>
@@ -97,6 +109,14 @@ struct hot_info {
struct dentry *debugfs_dentry;
};
+/*
+ * Hot data tracking ioctls:
+ *
+ * HOT_INFO - retrieve info on frequency of access
+ */
+#define FS_IOC_GET_HEAT_INFO _IOR('f', 17, \
+ struct hot_heat_info)
+
extern void __init hot_cache_init(void);
extern int hot_track_init(struct super_block *sb);
extern void hot_track_exit(struct super_block *sb);
@@ -108,6 +128,7 @@ extern struct hot_inode_item *hot_inode_item_lookup(struct hot_info *root,
extern struct hot_range_item *hot_range_item_lookup(struct hot_inode_item *he,
loff_t start, int alloc);
extern void hot_inode_item_delete(struct inode *inode);
+extern u32 hot_temp_calc(struct hot_comm_item *ci);
static inline u64 hot_shift(u64 counter, u32 bits, bool dir)
{
--
1.7.11.7
--
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