[PATCH 4/5] mm: Remove low limit from sync_writeback_pages()
From: Jan Kara <jack@suse.cz>
Date: 2011-03-08 22:31:14
Also in:
linux-fsdevel
Subsystem:
memory management, page cache, the rest · Maintainers:
Andrew Morton, Matthew Wilcox, Linus Torvalds
sync_writeback_pages() limited minimal amount of pages to write in balance_dirty_pages() to 3/2*ratelimit_pages (6 MB) to submit reasonably sized IO. Since we do not submit any IO anymore, be more fair and let the task wait only for 3/2*(the amount dirtied). CC: Andrew Morton <akpm@linux-foundation.org> CC: Christoph Hellwig <hch@infradead.org> CC: Dave Chinner <david@fromorbit.com> CC: Wu Fengguang <redacted> CC: Peter Zijlstra <redacted> Signed-off-by: Jan Kara <jack@suse.cz> --- mm/page-writeback.c | 9 ++------- 1 files changed, 2 insertions(+), 7 deletions(-)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 697dd8e..ff07280 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c@@ -43,16 +43,11 @@ static long ratelimit_pages = 32; /* - * When balance_dirty_pages decides that the caller needs to perform some - * non-background writeback, this is how many pages it will attempt to write. - * It should be somewhat larger than dirtied pages to ensure that reasonably - * large amounts of I/O are submitted. + * When balance_dirty_pages decides that the caller needs to wait for some + * writeback to happen, this is how many pages it will attempt to write. */ static inline long sync_writeback_pages(unsigned long dirtied) { - if (dirtied < ratelimit_pages) - dirtied = ratelimit_pages; - return dirtied + dirtied / 2; }
--
1.7.1
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