[PATCH 3/3] blkio-throttle: async write io instrumentation
From: Andrea Righi <hidden>
Date: 2011-02-28 10:17:17
Also in:
lkml
Subsystem:
memory management, page cache, the rest · Maintainers:
Andrew Morton, Matthew Wilcox, Jan Kara, Linus Torvalds
Enforce IO throttling policy to asynchronous IO writes at the time tasks write pages in the page cache. Signed-off-by: Andrea Righi <redacted> --- mm/page-writeback.c | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 2cb01f6..e3f5f4f 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c@@ -607,6 +607,19 @@ void set_page_dirty_balance(struct page *page, int page_mkwrite) } } +/* + * Get a request_queue of the underlying superblock device from an + * address_space. + */ +static struct request_queue *as_to_rq(struct address_space *mapping) +{ + struct block_device *bdev; + + bdev = (mapping->host && mapping->host->i_sb->s_bdev) ? + mapping->host->i_sb->s_bdev : NULL; + return bdev ? bdev_get_queue(bdev) : NULL; +} + static DEFINE_PER_CPU(unsigned long, bdp_ratelimits) = 0; /**
@@ -628,6 +641,7 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, { unsigned long ratelimit; unsigned long *p; + struct request_queue *q; ratelimit = ratelimit_pages; if (mapping->backing_dev_info->dirty_exceeded)
@@ -644,6 +658,9 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, ratelimit = sync_writeback_pages(*p); *p = 0; preempt_enable(); + q = as_to_rq(mapping); + if (q) + blk_throtl_async(q, ratelimit << PAGE_SHIFT); balance_dirty_pages(mapping, ratelimit); return; }
--
1.7.1
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