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Message-Id: <20070614220447.167706679@chello.nl>
References: <20070614215817.389524447@chello.nl>
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Date: Thu, 14 Jun 2007 23:58:30 +0200
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de, dgc@sgi.com,
       tomoki.sekiyama.qu@hitachi.com, a.p.zijlstra@chello.nl,
       nikita@clusterfs.com, trond.myklebust@fys.uio.no,
       yingchao.zhou@gmail.com, andrea@suse.de
Subject: [PATCH 13/17] mm: expose BDI statistics in sysfs.
Content-Disposition: inline; filename=bdi_stat_sysfs.patch
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Expose the per BDI stats in /sys/block/<dev>/queue/*

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 block/ll_rw_blk.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Index: linux-2.6/block/ll_rw_blk.c
===================================================================
--- linux-2.6.orig/block/ll_rw_blk.c
+++ linux-2.6/block/ll_rw_blk.c
@@ -3977,6 +3977,23 @@ static ssize_t queue_max_hw_sectors_show
 	return queue_var_show(max_hw_sectors_kb, (page));
 }
 
+static ssize_t queue_nr_reclaimable_show(struct request_queue *q, char *page)
+{
+	unsigned long long nr_reclaimable =
+		bdi_stat(&q->backing_dev_info, BDI_RECLAIMABLE);
+
+	return sprintf(page, "%llu\n",
+			nr_reclaimable >> (PAGE_CACHE_SHIFT - 10));
+}
+
+static ssize_t queue_nr_writeback_show(struct request_queue *q, char *page)
+{
+	unsigned long long nr_writeback =
+		bdi_stat(&q->backing_dev_info, BDI_WRITEBACK);
+
+	return sprintf(page, "%llu\n",
+			nr_writeback >> (PAGE_CACHE_SHIFT - 10));
+}
 
 static struct queue_sysfs_entry queue_requests_entry = {
 	.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
@@ -4001,6 +4018,16 @@ static struct queue_sysfs_entry queue_ma
 	.show = queue_max_hw_sectors_show,
 };
 
+static struct queue_sysfs_entry queue_reclaimable_entry = {
+	.attr = {.name = "reclaimable_kb", .mode = S_IRUGO },
+	.show = queue_nr_reclaimable_show,
+};
+
+static struct queue_sysfs_entry queue_writeback_entry = {
+	.attr = {.name = "writeback_kb", .mode = S_IRUGO },
+	.show = queue_nr_writeback_show,
+};
+
 static struct queue_sysfs_entry queue_iosched_entry = {
 	.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
 	.show = elv_iosched_show,
@@ -4012,6 +4039,8 @@ static struct attribute *default_attrs[]
 	&queue_ra_entry.attr,
 	&queue_max_hw_sectors_entry.attr,
 	&queue_max_sectors_entry.attr,
+	&queue_reclaimable_entry.attr,
+	&queue_writeback_entry.attr,
 	&queue_iosched_entry.attr,
 	NULL,
 };

--