The patch titled
writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds-update
has been added to the -mm tree. Its filename is
writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds-update.patch
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------------------------------------------------------
Subject: writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds-update
From: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Split get_dirty_limits() into global_dirty_limits()+bdi_dirty_limit(),
so that the latter can be avoided when under global dirty background
threshold (which is the normal state for most systems).
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page-writeback.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN mm/page-writeback.c~writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds-update mm/page-writeback.c
--- a/mm/page-writeback.c~writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds-update
+++ a/mm/page-writeback.c
@@ -443,7 +443,7 @@ unsigned long bdi_dirty_limit(struct bac
if (bdi_dirty > (dirty * bdi->max_ratio) / 100)
bdi_dirty = dirty * bdi->max_ratio / 100;
- return task_dirty_limit(current, bdi_dirty);
+ return bdi_dirty;
}
/*
@@ -477,6 +477,7 @@ static void balance_dirty_pages(struct a
nr_reclaimable = global_page_state(NR_FILE_DIRTY) +
global_page_state(NR_UNSTABLE_NFS);
nr_writeback = global_page_state(NR_WRITEBACK);
+
global_dirty_limits(&background_thresh, &dirty_thresh);
/*
@@ -489,6 +490,7 @@ static void balance_dirty_pages(struct a
break;
bdi_thresh = bdi_dirty_limit(bdi, dirty_thresh);
+ bdi_thresh = task_dirty_limit(current, bdi_thresh);
/*
* In order to avoid the stacked BDI deadlock we need
_
Patches currently in -mm which might be from fengguang.wu@xxxxxxxxx are
origin.patch
linux-next.patch
fs-inodec-work-around-bug.patch
include-linux-fsh-complete-hexification-of-fmode_-constants.patch
vfs-o_-bit-numbers-uniqueness-check.patch
vfs-introduce-fmode_neg_offset-for-allowing-negative-f_pos.patch
writeback-reduce-calls-to-global_page_state-in-balance_dirty_pages.patch
writeback-reduce-calls-to-global_page_state-in-balance_dirty_pages-update.patch
writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds.patch
writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds-update.patch
writeback-add-comment-to-the-dirty-limit-functions.patch
writeback-dont-redirty-tail-an-inode-with-dirty-pages.patch
writeback-fix-queue_io-ordering.patch
writeback-merge-for_kupdate-and-for_kupdate-cases.patch
vfs-add-super-operation-writeback_inodes.patch
--
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