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From: Stefan Roesch <[email protected]>
To: <[email protected]>, <[email protected]>,
	<[email protected]>, <[email protected]>,
	<[email protected]>
Cc: <[email protected]>, <[email protected]>, <[email protected]>, <[email protected]>
Subject: [PATCH v5 02/16] mm: Move updates of dirty_exceeded into one place
Date: Wed, 25 May 2022 15:34:18 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

From: Jan Kara <[email protected]>

Transition of wb->dirty_exceeded from 0 to 1 happens before we go to
sleep in balance_dirty_pages() while transition from 1 to 0 happens when
exiting from balance_dirty_pages(), possibly based on old values. This
does not make a lot of sense since wb->dirty_exceeded should simply
reflect whether wb is over dirty limit and so we should ratelimit
entering to balance_dirty_pages() less. Move the two updates together.

Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Stefan Roesch <[email protected]>
---
 mm/page-writeback.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 8e5e003f0093..89dcc7d8395a 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1720,8 +1720,8 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
 				sdtc = mdtc;
 		}
 
-		if (dirty_exceeded && !wb->dirty_exceeded)
-			wb->dirty_exceeded = 1;
+		if (dirty_exceeded != wb->dirty_exceeded)
+			wb->dirty_exceeded = dirty_exceeded;
 
 		if (time_is_before_jiffies(READ_ONCE(wb->bw_time_stamp) +
 					   BANDWIDTH_INTERVAL))
@@ -1825,9 +1825,6 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
 		if (fatal_signal_pending(current))
 			break;
 	}
-
-	if (!dirty_exceeded && wb->dirty_exceeded)
-		wb->dirty_exceeded = 0;
 }
 
 static DEFINE_PER_CPU(int, bdp_ratelimits);
-- 
2.30.2



  parent reply	other threads:[~2022-05-25 22:35 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-25 22:34 [PATCH v5 00/16] io-uring/xfs: support async buffered writes Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 01/16] mm: Move starting of background writeback into the main balancing loop Stefan Roesch
2022-05-25 22:34 ` Stefan Roesch [this message]
2022-05-25 22:34 ` [PATCH v5 03/16] mm: Add balance_dirty_pages_ratelimited_flags() function Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 04/16] iomap: Add flags parameter to iomap_page_create() Stefan Roesch
2022-05-26 13:43   ` Jan Kara
2022-05-26 17:39     ` Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 05/16] iomap: Add async buffered write support Stefan Roesch
2022-05-26 13:39   ` Jan Kara
2022-05-25 22:34 ` [PATCH v5 06/16] fs: Add check for async buffered writes to generic_write_checks Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 07/16] fs: add __remove_file_privs() with flags parameter Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 08/16] fs: Split off inode_needs_update_time and __file_update_time Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 09/16] fs: Add async write file modification handling Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 10/16] fs: Optimization for concurrent file time updates Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 11/16] io_uring: Add support for async buffered writes Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 12/16] io_uring: Add tracepoint for short writes Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 13/16] xfs: Specify lockmode when calling xfs_ilock_for_iomap() Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 14/16] xfs: Change function signature of xfs_ilock_iocb() Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 15/16] xfs: Add async buffered write support Stefan Roesch
2022-05-25 22:34 ` [PATCH v5 16/16] xfs: Enable " Stefan Roesch

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