From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20070911200015.989100000@chello.nl> References: <20070911195350.825778000@chello.nl> Date: Tue, 11 Sep 2007 21:54:13 +0200 From: Peter Zijlstra Subject: [PATCH 23/23] 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, richard@rsk.demon.co.uk, torvalds@linux-foundation.org List-ID: Expose the per bdi dirty limits in sysfs Signed-off-by: Peter Zijlstra --- block/ll_rw_blk.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++ mm/page-writeback.c | 4 +- 2 files changed, 83 insertions(+), 2 deletions(-) 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 @@ -4128,6 +4128,57 @@ static ssize_t queue_max_segments_store( return ret; } + +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); +} + +static ssize_t queue_nr_cache_num_show(struct request_queue *q, char *page) +{ + long scale, div; + + bdi_writeout_fraction(&q->backing_dev_info, &scale, &div); + + return sprintf(page, "%ld\n", scale); +} + +static ssize_t queue_nr_cache_denom_show(struct request_queue *q, char *page) +{ + long scale, div; + + bdi_writeout_fraction(&q->backing_dev_info, &scale, &div); + + return sprintf(page, "%ld\n", div); +} + +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, @@ -4167,6 +4218,31 @@ 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_num_entry = { + .attr = {.name = "cache_num", .mode = S_IRUGO }, + .show = queue_nr_cache_num_show, +}; + +static struct queue_sysfs_entry queue_cache_denom_entry = { + .attr = {.name = "cache_denom", .mode = S_IRUGO }, + .show = queue_nr_cache_denom_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, @@ -4181,6 +4257,11 @@ static struct attribute *default_attrs[] &queue_max_segments_entry.attr, &queue_reclaimable_entry.attr, &queue_writeback_entry.attr, + &queue_cache_ratio_entry.attr, + &queue_cache_num_entry.attr, + &queue_cache_denom_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 +++ linux-2.6/mm/page-writeback.c @@ -169,7 +169,7 @@ static inline void task_dirty_inc(struct /* * Obtain an accurate fraction of the BDI's portion. */ -static void bdi_writeout_fraction(struct backing_dev_info *bdi, +void bdi_writeout_fraction(struct backing_dev_info *bdi, long *numerator, long *denominator) { if (bdi_cap_writeback_dirty(bdi)) { @@ -291,7 +291,7 @@ 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