On 07/20/2015 04:20 PM, Kirill A. Shutemov wrote: > As with rmap, with new refcounting we cannot rely on PageTransHuge() to > check if we need to charge size of huge page form the cgroup. We need to > get information from caller to know whether it was mapped with PMD or > PTE. > > We do uncharge when last reference on the page gone. At that point if we > see PageTransHuge() it means we need to unchange whole huge page. > > The tricky part is partial unmap -- when we try to unmap part of huge > page. We don't do a special handing of this situation, meaning we don't > uncharge the part of huge page unless last user is gone or > split_huge_page() is triggered. In case of cgroup memory pressure > happens the partial unmapped page will be split through shrinker. This > should be good enough. > > Signed-off-by: Kirill A. Shutemov <[email protected]> > Tested-by: Sasha Levin <[email protected]> > Tested-by: Aneesh Kumar K.V <[email protected]> > Acked-by: Vlastimil Babka <[email protected]>
Acked-by: Jerome Marchand <[email protected]> > --- > include/linux/memcontrol.h | 16 +++++++----- > kernel/events/uprobes.c | 7 +++--- > mm/filemap.c | 8 +++--- > mm/huge_memory.c | 33 ++++++++++++------------ > mm/memcontrol.c | 62 > +++++++++++++++++----------------------------- > mm/memory.c | 28 ++++++++++----------- > mm/shmem.c | 21 +++++++++------- > mm/swapfile.c | 9 ++++--- > mm/userfaultfd.c | 6 ++--- > 9 files changed, 92 insertions(+), 98 deletions(-)
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