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mm: Move updates of dirty_exceeded into one place 

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 <jack@suse.cz>
Signed-off-by: Stefan Roesch <shr@fb.com>
Link: https://lore.kernel.org/r/20220623175157.1715274-3-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2022-06-23 10:51:45 -07:00 committed by Jens Axboe
parent ea6813be07
commit e92eebbb09
1 changed files with 2 additions and 5 deletions
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7
mm/page-writeback.c
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@ -1729,8 +1729,8 @@ free_running:
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))
@ -1834,9 +1834,6 @@ pause:
if (fatal_signal_pending(current))
break;
}
if (!dirty_exceeded && wb->dirty_exceeded)
wb->dirty_exceeded = 0;
}
static DEFINE_PER_CPU(int, bdp_ratelimits);