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Vladimir Davydov
f074a8f49e
As noted by Minchan, a benefit of reading idle flag from /proc/kpageflags is that one can easily filter dirty and/or unevictable pages while estimating the size of unused memory. Note that idle flag read from /proc/kpageflags may be stale in case the page was accessed via a PTE, because it would be too costly to iterate over all page mappings on each /proc/kpageflags read to provide an up-to-date value. To make sure the flag is up-to-date one has to read /sys/kernel/mm/page_idle/bitmap first. Signed-off-by: Vladimir Davydov <[email protected]> Reviewed-by: Andres Lagar-Cavilla <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Raghavendra K T <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Greg Thelen <[email protected]> Cc: Michel Lespinasse <[email protected]> Cc: David Rientjes <[email protected]> Cc: Pavel Emelyanov <[email protected]> Cc: Cyrill Gorcunov <[email protected]> Cc: Jonathan Corbet <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
40 lines
829 B
C
40 lines
829 B
C
#ifndef _UAPILINUX_KERNEL_PAGE_FLAGS_H
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#define _UAPILINUX_KERNEL_PAGE_FLAGS_H
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/*
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* Stable page flag bits exported to user space
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*/
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#define KPF_LOCKED 0
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#define KPF_ERROR 1
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#define KPF_REFERENCED 2
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#define KPF_UPTODATE 3
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#define KPF_DIRTY 4
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#define KPF_LRU 5
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#define KPF_ACTIVE 6
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#define KPF_SLAB 7
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#define KPF_WRITEBACK 8
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#define KPF_RECLAIM 9
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#define KPF_BUDDY 10
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/* 11-20: new additions in 2.6.31 */
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#define KPF_MMAP 11
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#define KPF_ANON 12
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#define KPF_SWAPCACHE 13
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#define KPF_SWAPBACKED 14
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#define KPF_COMPOUND_HEAD 15
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#define KPF_COMPOUND_TAIL 16
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#define KPF_HUGE 17
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#define KPF_UNEVICTABLE 18
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#define KPF_HWPOISON 19
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#define KPF_NOPAGE 20
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#define KPF_KSM 21
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#define KPF_THP 22
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#define KPF_BALLOON 23
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#define KPF_ZERO_PAGE 24
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#define KPF_IDLE 25
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#endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */
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