/usr/src/kernel-patches/lustre/patches/sd_iostats-2.6.26-vanilla.patch is in linux-patch-lustre 1.8.5+dfsg-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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===================================================================
--- linux-source-2.6.26.orig/drivers/scsi/Kconfig 2009-10-09 13:33:25.000000000 +0200
+++ linux-source-2.6.26/drivers/scsi/Kconfig 2009-10-09 13:39:06.000000000 +0200
@@ -81,6 +81,14 @@
In this case, do not compile the driver for your SCSI host adapter
(below) as a module either.
+config SD_IOSTATS
+ bool "Enable SCSI disk I/O stats"
+ depends on BLK_DEV_SD
+ default y
+ ---help---
+ This enables SCSI disk I/O stats collection. You must also enable
+ /proc file system support if you want this feature.
+
config CHR_DEV_ST
tristate "SCSI tape support"
depends on SCSI
Index: linux-source-2.6.26/drivers/scsi/scsi_proc.c
===================================================================
--- linux-source-2.6.26.orig/drivers/scsi/scsi_proc.c 2009-10-09 13:33:25.000000000 +0200
+++ linux-source-2.6.26/drivers/scsi/scsi_proc.c 2009-10-09 13:39:06.000000000 +0200
@@ -40,7 +40,8 @@
/* 4K page size, but our output routines, use some slack for overruns */
#define PROC_BLOCK_SIZE (3*1024)
-static struct proc_dir_entry *proc_scsi;
+struct proc_dir_entry *proc_scsi;
+EXPORT_SYMBOL(proc_scsi);
/* Protect sht->present and sht->proc_dir */
static DEFINE_MUTEX(global_host_template_mutex);
Index: linux-source-2.6.26/drivers/scsi/sd.c
===================================================================
--- linux-source-2.6.26.orig/drivers/scsi/sd.c 2009-10-09 13:33:25.000000000 +0200
+++ linux-source-2.6.26/drivers/scsi/sd.c 2009-10-09 13:39:50.000000000 +0200
@@ -107,6 +107,24 @@
* object after last put) */
static DEFINE_MUTEX(sd_ref_mutex);
+#if (defined(CONFIG_SD_IOSTATS) && defined(CONFIG_PROC_FS))
+# include <linux/proc_fs.h>
+# include <linux/seq_file.h>
+struct proc_dir_entry *sd_iostats_procdir = NULL;
+char sd_iostats_procdir_name[] = "sd_iostats";
+static struct file_operations sd_iostats_proc_fops;
+
+extern void sd_iostats_init(void);
+extern void sd_iostats_fini(void);
+void sd_iostats_start_req(struct scsi_cmnd *SCpnt);
+void sd_iostats_finish_req(struct scsi_cmnd *SCpnt);
+#else
+static inline void sd_iostats_init(void) {}
+static inline void sd_iostats_fini(void) {}
+static inline void sd_iostats_start_req(struct scsi_cmnd *SCpnt) {}
+static inline void sd_iostats_finish_req(struct scsi_cmnd *SCpnt) {}
+#endif
+
static const char *sd_cache_types[] = {
"write through", "none", "write back",
"write back, no read (daft)"
@@ -578,6 +596,8 @@
sdev = sdkp->device;
+ sd_iostats_start_req(SCpnt);
+
/*
* If the device is in error recovery, wait until it is done.
* If the device is offline, then disallow any access to it.
@@ -1023,6 +1043,7 @@
break;
}
out:
+ sd_iostats_finish_req(SCpnt);
return good_bytes;
}
@@ -1712,6 +1733,36 @@
if (sdp->removable)
gd->flags |= GENHD_FL_REMOVABLE;
+#if (defined(CONFIG_SD_IOSTATS) && defined(CONFIG_PROC_FS))
+ sdkp->stats = kzalloc(sizeof(iostat_stats_t), GFP_KERNEL);
+ if (!sdkp->stats) {
+ printk(KERN_WARNING "cannot allocate iostat structure for"
+ "%s\n", gd->disk_name);
+ } else {
+ do_gettimeofday(&sdkp->stats->iostat_timeval);
+ sdkp->stats->iostat_queue_stamp = jiffies;
+ spin_lock_init(&sdkp->stats->iostat_lock);
+ if (sd_iostats_procdir) {
+ struct proc_dir_entry *pde;
+ pde = create_proc_entry(gd->disk_name, S_IRUGO | S_IWUSR,
+ sd_iostats_procdir);
+ if (!pde) {
+ printk(KERN_WARNING "Can't create /proc/scsi/"
+ "%s/%s\n",
+ sd_iostats_procdir_name,
+ gd->disk_name);
+ kfree(sdkp->stats);
+ sdkp->stats = NULL;
+ } else {
+ pde->proc_fops = &sd_iostats_proc_fops;
+ pde->data = gd;
+ }
+ } else {
+ kfree(sdkp->stats);
+ sdkp->stats = NULL;
+ }
+ }
+#endif
dev_set_drvdata(dev, sdkp);
add_disk(gd);
@@ -1755,6 +1806,366 @@
return 0;
}
+#if (defined(CONFIG_SD_IOSTATS) && defined(CONFIG_PROC_FS))
+static int
+sd_iostats_seq_show(struct seq_file *seq, void *v)
+{
+ struct timeval now;
+ struct gendisk *disk = seq->private;
+ iostat_stats_t *stats;
+ unsigned long long read_len;
+ unsigned long long read_len_tot;
+ unsigned long read_num;
+ unsigned long read_num_tot;
+ unsigned long long write_len;
+ unsigned long long write_len_tot;
+ unsigned long write_num;
+ unsigned long write_num_tot;
+ int i;
+ int maxi;
+
+ stats = scsi_disk(disk)->stats;
+ if (stats == NULL) {
+ printk(KERN_ERR "sd_iostats_seq_show: NULL stats entry\n");
+ BUG();
+ }
+
+ do_gettimeofday(&now);
+ now.tv_sec -= stats->iostat_timeval.tv_sec;
+ now.tv_usec -= stats->iostat_timeval.tv_usec;
+ if (now.tv_usec < 0) {
+ now.tv_usec += 1000000;
+ now.tv_sec--;
+ }
+
+ /* this sampling races with updates */
+ seq_printf(seq, "index: %lu snapshot_time: %lu.%06lu\n",
+ (unsigned long) scsi_disk(disk)->index,
+ now.tv_sec, now.tv_usec);
+
+ for (i = IOSTAT_NCOUNTERS - 1; i > 0; i--)
+ if (stats->iostat_read_histogram[i].iostat_count != 0 ||
+ stats->iostat_write_histogram[i].iostat_count != 0)
+ break;
+ maxi = i;
+
+ seq_printf(seq, "%8s %8s %12s %8s %12s\n", "size",
+ "reads", "total", "writes", "total");
+
+ read_len_tot = write_len_tot = 0;
+ read_num_tot = write_num_tot = 0;
+ for (i = 0; i <= maxi; i++) {
+ read_len = stats->iostat_read_histogram[i].iostat_size;
+ read_len_tot += read_len;
+ read_num = stats->iostat_read_histogram[i].iostat_count;
+ read_num_tot += read_num;
+
+ write_len = stats->iostat_write_histogram[i].iostat_size;
+ write_len_tot += write_len;
+ write_num = stats->iostat_write_histogram[i].iostat_count;
+ write_num_tot += write_num;
+
+ seq_printf (seq, "%8d %8lu %12llu %8lu %12llu\n",
+ 512<<i, read_num, read_len, write_num, write_len);
+ }
+
+ seq_printf(seq, "%8s %8lu %12llu %8lu %12llu\n\n", "total",
+ read_num_tot, read_len_tot,
+ write_num_tot, write_len_tot);
+
+ seq_printf(seq, "%8s %8s %8s\n", "qdepth", "ticks", "%");
+ for (i = 0; i < IOSTAT_NCOUNTERS; i++) {
+ unsigned long long ticks, percent;
+ ticks = stats->iostat_queue_ticks[i];
+ if (ticks == 0)
+ continue;
+ percent = stats->iostat_queue_ticks[i] * 100;
+ do_div(percent, stats->iostat_queue_ticks_sum);
+ seq_printf(seq, "%8d %8llu %8llu\n", i, ticks, percent);
+ }
+
+ if (stats->iostat_reqs != 0) {
+ unsigned long long aveseek = 0, percent = 0;
+
+ if (stats->iostat_seeks) {
+ aveseek = stats->iostat_seek_sectors;
+ do_div(aveseek, stats->iostat_seeks);
+ percent = stats->iostat_seeks * 100;
+ do_div(percent, stats->iostat_reqs);
+ }
+
+ seq_printf(seq, "\n%llu sectors in %llu reqs: %llu seek(s) over "
+ "%llu sectors in ave, %llu%% of all reqs\n",
+ stats->iostat_sectors, stats->iostat_reqs,
+ stats->iostat_seeks, aveseek, percent);
+ }
+
+ seq_printf(seq, "\n%16s %8s %8s %8s %8s\n", "process time", "reads",
+ "%%", "writes", "%%");
+ for (i = 0; i < IOSTAT_NCOUNTERS; i++) {
+ unsigned long read_percent = 0, write_percent = 0;
+ if (stats->iostat_wtime[i] == 0 &&
+ stats->iostat_rtime[i] == 0)
+ continue;
+ if (stats->iostat_read_reqs)
+ read_percent = stats->iostat_rtime[i] * 100 /
+ stats->iostat_read_reqs;
+ if (stats->iostat_write_reqs)
+ write_percent = stats->iostat_wtime[i] * 100 /
+ stats->iostat_write_reqs;
+ seq_printf(seq, "%16u %8lu %8lu %8lu %8lu\n",
+ jiffies_to_msecs(((1UL << i) >> 1) << 1),
+ stats->iostat_rtime[i], read_percent,
+ stats->iostat_wtime[i], write_percent);
+ }
+
+ seq_printf(seq, "\n%16s %8s %8s %8s %8s\n", "time in queue", "reads",
+ "%%", "writes", "%%");
+ for (i = 0; i < IOSTAT_NCOUNTERS; i++) {
+ unsigned long read_percent = 0, write_percent = 0;
+ if (stats->iostat_wtime_in_queue[i] == 0 &&
+ stats->iostat_rtime_in_queue[i] == 0)
+ continue;
+ if (stats->iostat_read_reqs)
+ read_percent = stats->iostat_rtime_in_queue[i] * 100 /
+ stats->iostat_read_reqs;
+ if (stats->iostat_write_reqs)
+ write_percent = stats->iostat_wtime_in_queue[i] * 100 /
+ stats->iostat_write_reqs;
+ seq_printf(seq, "%16u %8lu %8lu %8lu %8lu\n",
+ jiffies_to_msecs(((1UL << i) >> 1) << 1),
+ stats->iostat_rtime_in_queue[i],
+ read_percent,
+ stats->iostat_wtime_in_queue[i],
+ write_percent);
+ }
+
+ return 0;
+}
+
+static void *
+sd_iostats_seq_start(struct seq_file *p, loff_t *pos)
+{
+ return (*pos == 0) ? (void *)1 : NULL;
+}
+
+static void *
+sd_iostats_seq_next(struct seq_file *p, void *v, loff_t *pos)
+{
+ ++*pos;
+ return NULL;
+}
+
+static void
+sd_iostats_seq_stop(struct seq_file *p, void *v)
+{
+}
+
+static struct seq_operations sd_iostats_seqops = {
+ .start = sd_iostats_seq_start,
+ .stop = sd_iostats_seq_stop,
+ .next = sd_iostats_seq_next,
+ .show = sd_iostats_seq_show,
+};
+
+static int
+sd_iostats_seq_open (struct inode *inode, struct file *file)
+{
+ int rc;
+
+ rc = seq_open(file, &sd_iostats_seqops);
+ if (rc != 0)
+ return rc;
+
+ ((struct seq_file *)file->private_data)->private = PDE(inode)->data;
+ return 0;
+}
+
+static ssize_t
+sd_iostats_seq_write(struct file *file, const char *buffer,
+ size_t len, loff_t *off)
+{
+ struct seq_file *seq = file->private_data;
+ struct gendisk *disk = seq->private;
+ iostat_stats_t *stats = scsi_disk(disk)->stats;
+ unsigned long flags;
+ unsigned long qdepth;
+
+
+ spin_lock_irqsave (&stats->iostat_lock, flags);
+ qdepth = stats->iostat_queue_depth;
+ memset (stats, 0, offsetof(iostat_stats_t, iostat_lock));
+ do_gettimeofday(&stats->iostat_timeval);
+ stats->iostat_queue_stamp = jiffies;
+ stats->iostat_queue_depth = qdepth;
+ spin_unlock_irqrestore (&stats->iostat_lock, flags);
+
+ return len;
+}
+
+static struct file_operations sd_iostats_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = sd_iostats_seq_open,
+ .read = seq_read,
+ .write = sd_iostats_seq_write,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+extern struct proc_dir_entry *proc_scsi;
+
+void
+sd_iostats_init(void)
+{
+ if (proc_scsi == NULL) {
+ printk(KERN_WARNING "No access to sd iostats: "
+ "proc_scsi is NULL\n");
+ return;
+ }
+
+ sd_iostats_procdir = create_proc_entry(sd_iostats_procdir_name,
+ S_IFDIR | S_IRUGO | S_IXUGO,
+ proc_scsi);
+ if (sd_iostats_procdir == NULL) {
+ printk(KERN_WARNING "No access to sd iostats: "
+ "can't create /proc/scsi/%s\n", sd_iostats_procdir_name);
+ return;
+ }
+}
+
+void sd_iostats_fini(void)
+{
+ if (proc_scsi != NULL && sd_iostats_procdir != NULL)
+ remove_proc_entry(sd_iostats_procdir_name, proc_scsi);
+
+ sd_iostats_procdir = NULL;
+}
+
+void sd_iostats_finish_req(struct scsi_cmnd *SCpnt)
+{
+ struct request *rq = SCpnt->request;
+ iostat_stats_t *stats;
+ unsigned long *tcounter;
+ int tbucket;
+ int tmp;
+ unsigned long irqflags;
+ unsigned long i;
+
+ stats = scsi_disk(rq->rq_disk)->stats;
+ if (stats == NULL)
+ return;
+
+ tmp = jiffies - rq->start_time;
+ for (tbucket = 0; tmp > 1; tbucket++)
+ tmp >>= 1;
+ if (tbucket >= IOSTAT_NCOUNTERS)
+ tbucket = IOSTAT_NCOUNTERS - 1;
+ //printk("%u ticks in D to %u\n", jiffies - rq->start_time, tbucket);
+
+ tcounter = rq_data_dir(rq) == WRITE ?
+ &stats->iostat_wtime[tbucket] : &stats->iostat_rtime[tbucket];
+
+ spin_lock_irqsave(&stats->iostat_lock, irqflags);
+
+ /* update delay stats */
+ (*tcounter)++;
+
+ /* update queue depth stats */
+ i = stats->iostat_queue_depth;
+ if (i >= IOSTAT_NCOUNTERS)
+ i = IOSTAT_NCOUNTERS - 1;
+ stats->iostat_queue_ticks[i] += jiffies - stats->iostat_queue_stamp;
+ stats->iostat_queue_ticks_sum += jiffies - stats->iostat_queue_stamp;
+ BUG_ON(stats->iostat_queue_depth == 0);
+ stats->iostat_queue_depth--;
+
+ /* update seek stats. XXX: not sure about nr_sectors */
+ stats->iostat_sectors += rq->nr_sectors;
+ stats->iostat_reqs++;
+ if (rq->sector != stats->iostat_next_sector) {
+ stats->iostat_seek_sectors +=
+ rq->sector > stats->iostat_next_sector ?
+ rq->sector - stats->iostat_next_sector :
+ stats->iostat_next_sector - rq->sector;
+ stats->iostat_seeks++;
+ }
+ stats->iostat_next_sector = rq->sector + rq->nr_sectors;
+
+ stats->iostat_queue_stamp = jiffies;
+
+ spin_unlock_irqrestore(&stats->iostat_lock, irqflags);
+}
+
+void sd_iostats_start_req(struct scsi_cmnd *SCpnt)
+{
+ struct request *rq = SCpnt->request;
+ iostat_stats_t *stats;
+ iostat_counter_t *counter;
+ int bucket;
+ int tbucket;
+ int tmp;
+ unsigned long irqflags;
+ unsigned long i;
+ int nsect;
+
+ stats = scsi_disk(rq->rq_disk)->stats;
+ if (stats == NULL)
+ return;
+
+ nsect = scsi_bufflen(SCpnt) >> 9;
+ for (bucket = 0, tmp = nsect; tmp > 1; bucket++)
+ tmp >>= 1;
+
+ if (bucket >= IOSTAT_NCOUNTERS) {
+ printk (KERN_ERR "sd_iostats_bump: nsect %d too big\n", nsect);
+ BUG();
+ }
+
+ counter = rq_data_dir(rq) == WRITE ?
+ &stats->iostat_write_histogram[bucket] :
+ &stats->iostat_read_histogram[bucket];
+
+ tmp = jiffies - rq->start_time;
+ for (tbucket = 0; tmp > 1; tbucket++)
+ tmp >>= 1;
+ if (tbucket >= IOSTAT_NCOUNTERS)
+ tbucket = IOSTAT_NCOUNTERS - 1;
+ //printk("%u ticks in Q to %u\n", jiffies - rq->start_time, tbucket);
+
+ /* an ugly hack to know exact processing time. the right
+ * solution is to add one more field to struct request
+ * hopefully it will break nothing ... */
+ rq->start_time = jiffies;
+
+ spin_lock_irqsave(&stats->iostat_lock, irqflags);
+
+ /* update queue depth stats */
+ i = stats->iostat_queue_depth;
+ if (i >= IOSTAT_NCOUNTERS)
+ i = IOSTAT_NCOUNTERS - 1;
+ stats->iostat_queue_ticks[i] += jiffies - stats->iostat_queue_stamp;
+ stats->iostat_queue_ticks_sum += jiffies - stats->iostat_queue_stamp;
+ stats->iostat_queue_depth++;
+
+ /* update delay stats */
+ if (rq_data_dir(rq) == WRITE) {
+ stats->iostat_wtime_in_queue[tbucket]++;
+ stats->iostat_write_reqs++;
+ } else {
+ stats->iostat_rtime_in_queue[tbucket]++;
+ stats->iostat_read_reqs++;
+ }
+
+ /* update size stats */
+ counter->iostat_size += nsect;
+ counter->iostat_count++;
+
+ stats->iostat_queue_stamp = jiffies;
+
+ spin_unlock_irqrestore(&stats->iostat_lock, irqflags);
+}
+#endif
+
/**
* scsi_disk_release - Called to free the scsi_disk structure
* @dev: pointer to embedded class device
@@ -1773,10 +2184,16 @@
idr_remove(&sd_index_idr, sdkp->index);
spin_unlock(&sd_index_lock);
+#if (defined(CONFIG_SD_IOSTATS) && defined(CONFIG_PROC_FS))
+ if (sdkp->stats) {
+ remove_proc_entry(disk->disk_name, sd_iostats_procdir);
+ kfree(sdkp->stats);
+ sdkp->stats = NULL;
+ }
+#endif
disk->private_data = NULL;
put_disk(disk);
put_device(&sdkp->device->sdev_gendev);
-
kfree(sdkp);
}
@@ -1890,6 +2307,8 @@
if (!majors)
return -ENODEV;
+ sd_iostats_init();
+
err = class_register(&sd_disk_class);
if (err)
goto err_out;
@@ -1905,6 +2324,7 @@
err_out:
for (i = 0; i < SD_MAJORS; i++)
unregister_blkdev(sd_major(i), "sd");
+ sd_iostats_fini();
return err;
}
Index: linux-source-2.6.26/include/scsi/sd.h
===================================================================
--- linux-source-2.6.26.orig/include/scsi/sd.h 2009-10-09 13:33:25.000000000 +0200
+++ linux-source-2.6.26/include/scsi/sd.h 2009-10-09 13:39:06.000000000 +0200
@@ -31,6 +31,46 @@
*/
#define SD_BUF_SIZE 512
+#if (defined(CONFIG_SD_IOSTATS) && defined(CONFIG_PROC_FS))
+typedef struct {
+ unsigned long long iostat_size;
+ unsigned long long iostat_count;
+} iostat_counter_t;
+
+#define IOSTAT_NCOUNTERS 16
+typedef struct {
+ iostat_counter_t iostat_read_histogram[IOSTAT_NCOUNTERS];
+ iostat_counter_t iostat_write_histogram[IOSTAT_NCOUNTERS];
+ struct timeval iostat_timeval;
+
+ /* queue depth: how well the pipe is filled up */
+ unsigned long long iostat_queue_ticks[IOSTAT_NCOUNTERS];
+ unsigned long long iostat_queue_ticks_sum;
+ unsigned long iostat_queue_depth;
+ unsigned long iostat_queue_stamp;
+
+ /* seeks: how linear the traffic is */
+ unsigned long long iostat_next_sector;
+ unsigned long long iostat_seek_sectors;
+ unsigned long long iostat_seeks;
+ unsigned long long iostat_sectors;
+ unsigned long long iostat_reqs;
+ unsigned long iostat_read_reqs;
+ unsigned long iostat_write_reqs;
+
+ /* process time: how long it takes to process requests */
+ unsigned long iostat_rtime[IOSTAT_NCOUNTERS];
+ unsigned long iostat_wtime[IOSTAT_NCOUNTERS];
+
+ /* queue time: how long process spent in elevator's queue */
+ unsigned long iostat_rtime_in_queue[IOSTAT_NCOUNTERS];
+ unsigned long iostat_wtime_in_queue[IOSTAT_NCOUNTERS];
+
+ /* must be the last field, as it's used to know size to be memset'ed */
+ spinlock_t iostat_lock;
+} ____cacheline_aligned_in_smp iostat_stats_t;
+#endif
+
struct scsi_disk {
struct scsi_driver *driver; /* always &sd_template */
struct scsi_device *device;
@@ -45,6 +85,9 @@
unsigned WCE : 1; /* state of disk WCE bit */
unsigned RCD : 1; /* state of disk RCD bit, unused */
unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
+#if (defined(CONFIG_SD_IOSTATS) && defined(CONFIG_PROC_FS))
+ iostat_stats_t *stats; /* scsi disk statistics */
+#endif
};
#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
|