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Message-ID: <035101c1c54a$a00b6e40$0501a8c0@Stev.org>
From: "James Stevenson" <mail-lists@stev.org>
To: "Jean-Eric Cuendet" <jean-eric.cuendet@linkvest.com>,
        <linux-kernel@vger.kernel.org>
In-Reply-To: <3C86553E.3070608@linkvest.com>
Subject: Re: [PATCH] Rework of /proc/stat
Date: Wed, 6 Mar 2002 20:08:04 -0000
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Hi

would a patch like this not make more sense
i picked it up on this list a while ago i cannot remember who wrote it
fixed it a bit and it does much the same except it alows you to have
any number of block devices though it does not work with scsi properly yet.

diff against 2.4.18

>
> Hi,
> I've made a new version of IO statistics in kstat that remove the
> previous limitations of MAX_MAJOR. I've made tests on my machine only, so
could someone test it, please?
> Feedback welcome.
> Bye
> -jec
>
> Patch attached.
>
Index: v2.4/drivers/block/ll_rw_blk.c
diff -u v2.4/drivers/block/ll_rw_blk.c:1.1.1.2
v2.4/drivers/block/ll_rw_blk.c:1.1.1.2.2.1
--- v2.4/drivers/block/ll_rw_blk.c:1.1.1.2 Mon Feb 25 21:54:45 2002
+++ v2.4/drivers/block/ll_rw_blk.c Mon Feb 25 22:53:10 2002
@@ -183,7 +183,11 @@

  if (count)
   printk("blk_cleanup_queue: leaked requests (%d)\n", count);
-
+ /*
+  * free statistics structure
+  */
+ kfree(q->dk_stat);
+
  memset(q, 0, sizeof(*q));
 }

@@ -393,6 +397,8 @@
  **/
 void blk_init_queue(request_queue_t * q, request_fn_proc * rfn)
 {
+ struct disk_stat * new;
+
  INIT_LIST_HEAD(&q->queue_head);
  elevator_init(&q->elevator, ELEVATOR_LINUS);
  blk_init_free_list(q);
@@ -413,6 +419,15 @@
   */
  q->plug_device_fn  = generic_plug_device;
  q->head_active     = 1;
+ /*
+  * At last, allocate and initialize the statistics
+  */
+ new = kmalloc(sizeof(struct disk_stat), GFP_KERNEL);
+ if (new == NULL)
+  printk(KERN_ERR "blk_init_queue:error allocating statisitcs\n");
+ else
+  memset(new, 0, sizeof(struct disk_stat));
+ q->dk_stat = new;
 }

 #define blkdev_free_rq(list) list_entry((list)->next, struct request,
queue);
@@ -497,23 +512,18 @@
  else ro_bits[major][minor >> 5] &= ~(1 << (minor & 31));
 }

-inline void drive_stat_acct (kdev_t dev, int rw,
+inline void drive_stat_acct (struct disk_stat * ds, int rw,
     unsigned long nr_sectors, int new_io)
 {
- unsigned int major = MAJOR(dev);
- unsigned int index;
-
- index = disk_index(dev);
- if ((index >= DK_MAX_DISK) || (major >= DK_MAX_MAJOR))
+ if (ds == NULL)
   return;

- kstat.dk_drive[major][index] += new_io;
  if (rw == READ) {
-  kstat.dk_drive_rio[major][index] += new_io;
-  kstat.dk_drive_rblk[major][index] += nr_sectors;
+  ds->dk_drive_rio += new_io;
+  ds->dk_drive_rblk += nr_sectors;
  } else if (rw == WRITE) {
-  kstat.dk_drive_wio[major][index] += new_io;
-  kstat.dk_drive_wblk[major][index] += nr_sectors;
+  ds->dk_drive_wio += new_io;
+  ds->dk_drive_wblk += nr_sectors;
  } else
   printk(KERN_ERR "drive_stat_acct: cmd not R/W?\n");
 }
@@ -529,7 +539,7 @@
 static inline void add_request(request_queue_t * q, struct request * req,
           struct list_head *insert_here)
 {
- drive_stat_acct(req->rq_dev, req->cmd, req->nr_sectors, 1);
+ drive_stat_acct(q->dk_stat, req->cmd, req->nr_sectors, 1);

  if (!q->plugged && q->head_active && insert_here == &q->queue_head) {
   spin_unlock_irq(&io_request_lock);
@@ -703,7 +713,7 @@
    req->bhtail = bh;
    req->nr_sectors = req->hard_nr_sectors += count;
    blk_started_io(count);
-   drive_stat_acct(req->rq_dev, req->cmd, count, 0);
+   drive_stat_acct(q->dk_stat, req->cmd, count, 0);
    attempt_back_merge(q, req, max_sectors, max_segments);
    goto out;

@@ -720,7 +730,7 @@
    req->sector = req->hard_sector = sector;
    req->nr_sectors = req->hard_nr_sectors += count;
    blk_started_io(count);
-   drive_stat_acct(req->rq_dev, req->cmd, count, 0);
+   drive_stat_acct(q->dk_stat, req->cmd, count, 0);
    attempt_front_merge(q, head, req, max_sectors, max_segments);
    goto out;

Index: v2.4/drivers/ide/ide.c
diff -u v2.4/drivers/ide/ide.c:1.1.1.2 v2.4/drivers/ide/ide.c:1.1.1.2.2.1
--- v2.4/drivers/ide/ide.c:1.1.1.2 Mon Feb 25 21:55:52 2002
+++ v2.4/drivers/ide/ide.c Mon Feb 25 22:53:10 2002
@@ -1454,8 +1454,10 @@
 request_queue_t *ide_get_queue (kdev_t dev)
 {
  ide_hwif_t *hwif = (ide_hwif_t *)blk_dev[MAJOR(dev)].data;
-
- return &hwif->drives[DEVICE_NR(dev) & 1].queue;
+ if (DEVICE_NR(dev) >= MAX_DRIVES)
+   return NULL;
+ else
+  return &hwif->drives[DEVICE_NR(dev)].queue;
 }

 /*
Index: v2.4/drivers/md/md.c
diff -u v2.4/drivers/md/md.c:1.1.1.2 v2.4/drivers/md/md.c:1.1.1.2.2.1
--- v2.4/drivers/md/md.c:1.1.1.2 Mon Feb 25 21:55:55 2002
+++ v2.4/drivers/md/md.c Mon Feb 25 22:53:10 2002
@@ -3308,12 +3308,15 @@
  ITERATE_RDEV(mddev,rdev,tmp) {
   int major = MAJOR(rdev->dev);
   int idx = disk_index(rdev->dev);
-
+  request_queue_t * rq = blk_get_queue(rdev->dev);
+
   if ((idx >= DK_MAX_DISK) || (major >= DK_MAX_MAJOR))
    continue;
-
-  curr_events = kstat.dk_drive_rblk[major][idx] +
-      kstat.dk_drive_wblk[major][idx] ;
+
+  if (rq == NULL || (rq->dk_stat == NULL))
+   continue;
+  curr_events = rq->dk_stat->dk_drive_rblk +
+   rq->dk_stat->dk_drive_wblk ;
   curr_events -= sync_io[major][idx];
   if ((curr_events - rdev->last_events) > 32) {
    rdev->last_events = curr_events;
Index: v2.4/fs/proc/proc_misc.c
diff -u v2.4/fs/proc/proc_misc.c:1.1.1.1
v2.4/fs/proc/proc_misc.c:1.1.1.1.4.1
--- v2.4/fs/proc/proc_misc.c:1.1.1.1 Sun Jan 13 15:50:20 2002
+++ v2.4/fs/proc/proc_misc.c Mon Feb 25 22:53:10 2002
@@ -36,12 +36,12 @@
 #include <linux/init.h>
 #include <linux/smp_lock.h>
 #include <linux/seq_file.h>
+#include <linux/blkdev.h>

 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/io.h>

-
 #define LOAD_INT(x) ((x) >> FSHIFT)
 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
 /*
@@ -234,7 +234,23 @@
  release: seq_release,
 };
 #endif
-
+static int show_disk_stat(char * page, int len, struct disk_stat * ds,
+     int major, int disk)
+{
+ int active = ds->dk_drive_rio + ds->dk_drive_wio +
+   ds->dk_drive_rblk + ds->dk_drive_wblk;
+ if (active)
+  len += sprintf(page + len,
+   "(%u,%u):(%u,%u,%u,%u,%u) ",
+   major, disk,
+   ds->dk_drive_rio + ds->dk_drive_wio,
+   ds->dk_drive_rio,
+   ds->dk_drive_rblk,
+   ds->dk_drive_wio,
+   ds->dk_drive_wblk
+  );
+ return len;
+}
 static int kstat_read_proc(char *page, char **start, off_t off,
      int count, int *eof, void *data)
 {
@@ -284,21 +300,30 @@

  len += sprintf(page + len, "\ndisk_io: ");

- for (major = 0; major < DK_MAX_MAJOR; major++) {
-  for (disk = 0; disk < DK_MAX_DISK; disk++) {
-   int active = kstat.dk_drive[major][disk] +
-    kstat.dk_drive_rblk[major][disk] +
-    kstat.dk_drive_wblk[major][disk];
-   if (active)
-    len += sprintf(page + len,
-     "(%u,%u):(%u,%u,%u,%u,%u) ",
-     major, disk,
-     kstat.dk_drive[major][disk],
-     kstat.dk_drive_rio[major][disk],
-     kstat.dk_drive_rblk[major][disk],
-     kstat.dk_drive_wio[major][disk],
-     kstat.dk_drive_wblk[major][disk]
-   );
+ for (major = 0; major < MAX_BLKDEV; major++) {
+  struct disk_stat * ds;
+
+  if (!(blk_dev[major].queue)){
+   ds = (BLK_DEFAULT_QUEUE(major))->dk_stat;
+   if (ds)
+    len = show_disk_stat(page, len, ds, major, 0);
+  }else {
+   request_queue_t * q;
+   struct gendisk * hd = get_gendisk(MKDEV(major,0));
+   int max_disk;
+   if (!hd)
+    continue;
+   max_disk = MINORMASK>>hd->minor_shift;
+
+   for (disk = 0; disk <= max_disk; disk++) {
+    q = blk_get_queue(MKDEV(major,disk<<hd->minor_shift));
+    if (!q)
+     continue;
+    ds = q->dk_stat;
+    if (!ds)
+     continue;
+    len = show_disk_stat(page, len, ds, major,disk);
+   }
   }
  }

Index: v2.4/include/linux/blkdev.h
diff -u v2.4/include/linux/blkdev.h:1.1.1.1
v2.4/include/linux/blkdev.h:1.1.1.1.4.1
--- v2.4/include/linux/blkdev.h:1.1.1.1 Sun Jan 13 15:50:24 2002
+++ v2.4/include/linux/blkdev.h Mon Feb 25 22:53:10 2002
@@ -71,6 +71,13 @@
  struct list_head free;
 };

+struct disk_stat{
+ unsigned int dk_drive_rio;
+ unsigned int dk_drive_wio;
+ unsigned int dk_drive_rblk;
+ unsigned int dk_drive_wblk;
+};
+
 struct request_queue
 {
  /*
@@ -122,6 +129,10 @@
   * Tasks wait here for free request
   */
  wait_queue_head_t wait_for_request;
+ /*
+  * statistics
+  */
+ struct disk_stat * dk_stat;
 };

 struct blk_dev_struct {
@@ -186,7 +197,7 @@
 #define blkdev_next_request(req) blkdev_entry_to_request((req)->queue.next)
 #define blkdev_prev_request(req) blkdev_entry_to_request((req)->queue.prev)

-extern void drive_stat_acct (kdev_t dev, int rw,
+extern void drive_stat_acct (struct disk_stat *, int rw,
      unsigned long nr_sectors, int new_io);

 static inline int get_hardsect_size(kdev_t dev)
Index: v2.4/include/linux/kernel_stat.h
diff -u v2.4/include/linux/kernel_stat.h:1.1.1.1
v2.4/include/linux/kernel_stat.h:1.1.1.1.4.1
--- v2.4/include/linux/kernel_stat.h:1.1.1.1 Sun Jan 13 15:50:24 2002
+++ v2.4/include/linux/kernel_stat.h Mon Feb 25 22:53:10 2002
@@ -19,11 +19,6 @@
  unsigned int per_cpu_user[NR_CPUS],
               per_cpu_nice[NR_CPUS],
               per_cpu_system[NR_CPUS];
- unsigned int dk_drive[DK_MAX_MAJOR][DK_MAX_DISK];
- unsigned int dk_drive_rio[DK_MAX_MAJOR][DK_MAX_DISK];
- unsigned int dk_drive_wio[DK_MAX_MAJOR][DK_MAX_DISK];
- unsigned int dk_drive_rblk[DK_MAX_MAJOR][DK_MAX_DISK];
- unsigned int dk_drive_wblk[DK_MAX_MAJOR][DK_MAX_DISK];
  unsigned int pgpgin, pgpgout;
  unsigned int pswpin, pswpout;
 #if !defined(CONFIG_ARCH_S390)




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end

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