From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20070510101129.732392567@chello.nl> References: <20070510100839.621199408@chello.nl> Date: Thu, 10 May 2007 12:08:52 +0200 From: Peter Zijlstra Subject: [PATCH 13/15] debug: sysfs files for the current ratio/size/total Content-Disposition: inline; filename=bdi_stat_debug.patch Sender: owner-linux-mm@kvack.org Return-Path: 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 List-ID: Expose the per bdi dirty limits in sysfs Signed-off-by: Peter Zijlstra --- block/ll_rw_blk.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ mm/page-writeback.c | 4 ++-- 2 files changed, 52 insertions(+), 2 deletions(-) Index: linux-2.6/block/ll_rw_blk.c =================================================================== --- linux-2.6.orig/block/ll_rw_blk.c 2007-05-04 09:57:52.000000000 +0200 +++ linux-2.6/block/ll_rw_blk.c 2007-05-04 10:00:23.000000000 +0200 @@ -3998,6 +3998,38 @@ static ssize_t queue_nr_writeback_show(s nr_writeback >> (PAGE_CACHE_SHIFT - 10)); } +extern void bdi_writeout_fraction(struct backing_dev_info *bdi, + long *numerator, long *denominator); + +static ssize_t queue_nr_cache_ratio_show(struct request_queue *q, char *page) +{ + long scale, div; + + bdi_writeout_fraction(&q->backing_dev_info, &scale, &div); + scale *= 1024; + scale /= div; + + return sprintf(page, "%ld\n", scale); +} + +extern void +get_dirty_limits(long *pbackground, long *pdirty, long *pbdi_dirty, + struct backing_dev_info *bdi); + +static ssize_t queue_nr_cache_size_show(struct request_queue *q, char *page) +{ + long background, dirty, bdi_dirty; + get_dirty_limits(&background, &dirty, &bdi_dirty, &q->backing_dev_info); + return sprintf(page, "%ld\n", bdi_dirty); +} + +static ssize_t queue_nr_cache_total_show(struct request_queue *q, char *page) +{ + long background, dirty, bdi_dirty; + get_dirty_limits(&background, &dirty, &bdi_dirty, &q->backing_dev_info); + return sprintf(page, "%ld\n", dirty); +} + static struct queue_sysfs_entry queue_requests_entry = { .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, .show = queue_requests_show, @@ -4037,6 +4069,21 @@ static struct queue_sysfs_entry queue_wr .show = queue_nr_writeback_show, }; +static struct queue_sysfs_entry queue_cache_ratio_entry = { + .attr = {.name = "cache_ratio", .mode = S_IRUGO }, + .show = queue_nr_cache_ratio_show, +}; + +static struct queue_sysfs_entry queue_cache_size_entry = { + .attr = {.name = "cache_size", .mode = S_IRUGO }, + .show = queue_nr_cache_size_show, +}; + +static struct queue_sysfs_entry queue_cache_total_entry = { + .attr = {.name = "cache_total", .mode = S_IRUGO }, + .show = queue_nr_cache_total_show, +}; + static struct queue_sysfs_entry queue_iosched_entry = { .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, .show = elv_iosched_show, @@ -4051,6 +4098,9 @@ static struct attribute *default_attrs[] &queue_max_sectors_entry.attr, &queue_reclaimable_entry.attr, &queue_writeback_entry.attr, + &queue_cache_ratio_entry.attr, + &queue_cache_size_entry.attr, + &queue_cache_total_entry.attr, &queue_iosched_entry.attr, NULL, }; Index: linux-2.6/mm/page-writeback.c =================================================================== --- linux-2.6.orig/mm/page-writeback.c 2007-05-04 09:58:04.000000000 +0200 +++ linux-2.6/mm/page-writeback.c 2007-05-04 10:00:37.000000000 +0200 @@ -402,7 +402,7 @@ static void __bdi_writeout_inc(struct ba * * p_{j} = x_{j} / (period/2 + t % period/2) */ -static void bdi_writeout_fraction(struct backing_dev_info *bdi, +void bdi_writeout_fraction(struct backing_dev_info *bdi, long *numerator, long *denominator) { struct vm_completions_data *vcd = get_vcd(); @@ -477,7 +477,7 @@ static unsigned long determine_dirtyable return x + 1; /* Ensure that we never return 0 */ } -static void +void get_dirty_limits(long *pbackground, long *pdirty, long *pbdi_dirty, struct backing_dev_info *bdi) { -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org