The patch titled
debug: sysfs files for the current ratio/size/total
has been added to the -mm tree. Its filename is
debug-sysfs-files-for-the-current-ratio-size-total.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: debug: sysfs files for the current ratio/size/total
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Expose the per bdi dirty limits in sysfs
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
block/ll_rw_blk.c | 81 ++++++++++++++++++++++++++++++++++++++++++
mm/page-writeback.c | 4 +-
2 files changed, 83 insertions(+), 2 deletions(-)
diff -puN block/ll_rw_blk.c~debug-sysfs-files-for-the-current-ratio-size-total block/ll_rw_blk.c
--- a/block/ll_rw_blk.c~debug-sysfs-files-for-the-current-ratio-size-total
+++ a/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,
};
diff -puN mm/page-writeback.c~debug-sysfs-files-for-the-current-ratio-size-total mm/page-writeback.c
--- a/mm/page-writeback.c~debug-sysfs-files-for-the-current-ratio-size-total
+++ a/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)) {
@@ -290,7 +290,7 @@ 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)
{
_
Patches currently in -mm which might be from a.p.zijlstra@xxxxxxxxx are
radix-tree-use-indirect-bit.patch
nfs-remove-congestion_end.patch
lib-percpu_counter_add.patch
lib-percpu_counter_sub.patch
lib-percpu_counter-variable-batch.patch
lib-make-percpu_counter_add-take-s64.patch
lib-percpu_counter_set.patch
lib-percpu_counter_sum_positive.patch
lib-percpu_count_sum.patch
lib-percpu_counter_init-error-handling.patch
lib-percpu_counter_init_irq.patch
mm-bdi-init-hooks.patch
mtd-bdi-init-hooks.patch
mtd-clean-up-the-backing_dev_info-usage.patch
mtd-give-mtdconcat-devices-their-own-backing_dev_info.patch
mm-scalable-bdi-statistics-counters.patch
mm-count-reclaimable-pages-per-bdi.patch
mm-count-writeback-pages-per-bdi.patch
mm-expose-bdi-statistics-in-sysfs.patch
lib-floating-proportions.patch
mm-per-device-dirty-threshold.patch
mm-dirty-balancing-for-tasks.patch
debug-sysfs-files-for-the-current-ratio-size-total.patch
intel-iommu-dmar-detection-and-parsing-logic.patch
intel-iommu-pci-generic-helper-function.patch
intel-iommu-clflush_cache_range-now-takes-size-param.patch
intel-iommu-iova-allocation-and-management-routines.patch
intel-iommu-intel-iommu-driver.patch
intel-iommu-avoid-memory-allocation-failures-in-dma-map-api-calls.patch
intel-iommu-intel-iommu-cmdline-option-forcedac.patch
intel-iommu-dmar-fault-handling-support.patch
intel-iommu-iommu-gfx-workaround.patch
intel-iommu-iommu-floppy-workaround.patch
task-containersv11-shared-container-subsystem-group-arrays-avoid-lockdep-warning.patch
task-containersv11-shared-container-subsystem-group-arrays-include-fix.patch
containers-bdi-init-hooks.patch
workqueue-debug-flushing-deadlocks-with-lockdep.patch
workqueue-debug-work-related-deadlocks-with-lockdep.patch
memory-controller-add-documentation.patch
memory-controller-resource-counters-v7.patch
memory-controller-containers-setup-v7.patch
memory-controller-accounting-setup-v7.patch
memory-controller-memory-accounting-v7.patch
memory-controller-task-migration-v7.patch
memory-controller-add-per-container-lru-and-reclaim-v7.patch
memory-controller-add-per-container-lru-and-reclaim-v7-fix.patch
memory-controller-improve-user-interface.patch
memory-controller-oom-handling-v7.patch
memory-controller-add-switch-to-control-what-type-of-pages-to-limit-v7.patch
memory-controller-make-page_referenced-container-aware-v7.patch
memory-controller-make-charging-gfp-mask-aware.patch
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