Hi all, This is version 2 of a patch series[1] aimed at removing repeated allocation/free cycles happening in show_numa_maps() while we hold a reference to an mm. The concern is that performing an allocation while referencing an mm could lead to a stalemate in the oom killer as previously explained by Hugh Dickins[2]. This series addresses all issues raised in the previous round and is organized as follows: Patches 1-6 convert show_numa_maps() to use the generic walk_page_range() functionality instead of the mempolicy.c specific page table walking logic. Also, get_vma_policy() and mpol_to_str() are exported. This makes the show_numa_maps() implementation independent of mempolicy.c. Patch 7 moves show_numa_maps() and supporting routines over to fs/proc/task_mmu.c. Finally, patches 8 and 9 provide minor cleanup and eliminate the troublesome allocation. These patches are based on mmotm-2011-05-12-15-52 and have been tested on a dual node NUMA machine. Thanks, -- steve [1] http://lkml.org/lkml/2011/4/27/578 [2] http://lkml.org/lkml/2011/4/25/496 Changes since v1: - Fix compilation error when CONFIG_TMPFS=n. - Traverse pte's with proper locking and checks. Stephen Wilson (9): mm: export get_vma_policy() mm: use walk_page_range() instead of custom page table walking code mm: remove MPOL_MF_STATS mm: make gather_stats() type-safe and remove forward declaration mm: remove check_huge_range() mm: declare mpol_to_str() when CONFIG_TMPFS=n mm: proc: move show_numa_map() to fs/proc/task_mmu.c proc: make struct proc_maps_private truly private proc: allocate storage for numa_maps statistics once fs/proc/internal.h | 7 ++ fs/proc/task_mmu.c | 204 ++++++++++++++++++++++++++++++++++++++++++++- include/linux/mempolicy.h | 7 +- include/linux/proc_fs.h | 8 -- mm/mempolicy.c | 164 +----------------------------------- 5 files changed, 215 insertions(+), 175 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx 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>