Hello, Currently, I try to enable huge pages for SHM (and generally for any page cache), during this I ran into problem with ref-countig of huge pages. Due to this I would like to propose patch for changing ref-counting for compound page and allowing auto destruction of such page. I tried to revert behavior from 2.6 kernels, and to make it concurrently safe, as well sophisticated and compatible with THP. I hope this removes risky way through call get_user_pages, too. For me enabling such ref-counting is really important to continue work, and to prevent huge changes in page cache managing. Regards, Radosław Smogura (1): mm: Change of refcounting method for compound page. include/linux/mm.h | 94 +++++++++++----- include/linux/mm_types.h | 24 ++++- include/linux/pagemap.h | 1 - mm/huge_memory.c | 30 ++--- mm/internal.h | 46 -------- mm/memory.c | 2 +- mm/page_alloc.c | 2 + mm/swap.c | 272 ++++++++++++++++++++++++++++++---------------- 8 files changed, 279 insertions(+), 192 deletions(-) -- 1.7.3.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>