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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 <vdavydov@parallels.com> Reviewed-by: Andres Lagar-Cavilla <andreslc@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Greg Thelen <gthelen@google.com> Cc: Michel Lespinasse <walken@google.com> Cc: David Rientjes <rientjes@google.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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.. | ||
.gitignore | ||
00-INDEX | ||
active_mm.txt | ||
balance | ||
cleancache.txt | ||
frontswap.txt | ||
highmem.txt | ||
hugetlbpage.txt | ||
hwpoison.txt | ||
idle_page_tracking.txt | ||
ksm.txt | ||
numa | ||
numa_memory_policy.txt | ||
overcommit-accounting | ||
page_migration | ||
page_owner.txt | ||
pagemap.txt | ||
remap_file_pages.txt | ||
slub.txt | ||
soft-dirty.txt | ||
split_page_table_lock | ||
transhuge.txt | ||
unevictable-lru.txt | ||
userfaultfd.txt | ||
zsmalloc.txt | ||
zswap.txt |