linux-kernel - [Patch 5/6] Enhanced partition statistics: procfs

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Date:	Fri, 01 Feb 2008 19:14:24 +0100
From:	Jerome Marchand <jmarchan@...hat.com>
To:	linux-kernel@...r.kernel.org
CC:	axboe@...nel.dk, "Ed L. Cashin" <ecashin@...aid.com>
Subject: [Patch 5/6] Enhanced partition statistics: procfs

Reports enhanced partition statistics in /proc/diskstats.

Signed-off-by: Jerome Marchand <jmarchan@...hat.com>
---
 block/genhd.c |   28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)
diff -uprN -X linux-2.6/Documentation/dontdiff linux-2.6.orig/block/genhd.c linux-2.6/block/genhd.c
--- linux-2.6.orig/block/genhd.c	2008-01-31 16:44:09.000000000 +0100
+++ linux-2.6/block/genhd.c	2008-01-31 17:59:28.000000000 +0100
@@ -584,12 +584,28 @@ static int diskstats_show(struct seq_fil
 	for (n = 0; n < gp->minors - 1; n++) {
 		struct hd_struct *hd = gp->part[n];
 
-		if (hd && hd->nr_sects)
-			seq_printf(s, "%4d %4d %s %u %u %u %u\n",
-				gp->major, n + gp->first_minor + 1,
-				disk_name(gp, n + 1, buf),
-				hd->ios[0], hd->sectors[0],
-				hd->ios[1], hd->sectors[1]);
+		if (!hd || !hd->nr_sects)
+			continue;
+
+		preempt_disable();
+		part_round_stats(hd);
+		preempt_enable();
+		seq_printf(s, "%4d %4d %s %lu %lu %llu "
+			   "%u %lu %lu %llu %u %u %u %u\n",
+			   gp->major, n + gp->first_minor + 1,
+			   disk_name(gp, n + 1, buf),
+			   part_stat_read(hd, ios[0]),
+			   part_stat_read(hd, merges[0]),
+			   (unsigned long long)part_stat_read(hd, sectors[0]),
+			   jiffies_to_msecs(part_stat_read(hd, ticks[0])),
+			   part_stat_read(hd, ios[1]),
+			   part_stat_read(hd, merges[1]),
+			   (unsigned long long)part_stat_read(hd, sectors[1]),
+			   jiffies_to_msecs(part_stat_read(hd, ticks[1])),
+			   hd->in_flight,
+			   jiffies_to_msecs(part_stat_read(hd, io_ticks)),
+			   jiffies_to_msecs(part_stat_read(hd, time_in_queue))
+			);
 	}
  
 	return 0;

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