2016-09-10 12:54:26 +00:00
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From 8ca7ff8021f8d9bcbac83bd4584da9bbc854b829 Mon Sep 17 00:00:00 2001
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2016-01-17 10:42:23 +00:00
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From: popcornmix <popcornmix@gmail.com>
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Date: Wed, 18 Jun 2014 13:42:01 +0100
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] vmstat: Workaround for issue where dirty page count goes
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negative
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2016-01-17 10:42:23 +00:00
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See:
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https://github.com/raspberrypi/linux/issues/617
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http://www.spinics.net/lists/linux-mm/msg72236.html
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---
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include/linux/vmstat.h | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/include/linux/vmstat.h
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+++ b/include/linux/vmstat.h
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@@ -219,7 +219,11 @@ static inline void __inc_zone_state(stru
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static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
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{
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atomic_long_dec(&zone->vm_stat[item]);
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+ if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&zone->vm_stat[item]) < 0))
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+ atomic_long_set(&zone->vm_stat[item], 0);
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atomic_long_dec(&vm_stat[item]);
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+ if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&vm_stat[item]) < 0))
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+ atomic_long_set(&vm_stat[item], 0);
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}
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static inline void __inc_zone_page_state(struct page *page,
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