In many data center servers, the shared memory architectures is Non-Uniform Memory Access (NUMA), remote numa node data access often brings a high latency problem, but what we are easy to ignore is that the page table remote numa access, It can also leads to a performance degradation. So there add a new interface in /proc, This will help developers to get more info about performance issues if they are caused by cross-NUMA. V4 -> V3 1, Add some detects and spinlock when operating PMD page as Baolin Wang advised. V2 -> V3 1, Fix compile warning bug. V1 -> V2 1, As Matthew Wilcox advise, Simplify the code. 2, Do some codes format fix. V3: https://lore.kernel.org/linux-mm/20220801032704.64356-1-xhao@xxxxxxxxxxxxxxxxx/ V2: https://lore.kernel.org/linux-mm/20220731155223.60238-1-xhao@xxxxxxxxxxxxxxxxx/ V1: https://lore.kernel.org/linux-mm/YuVqdcY8Ibib2LJa@xxxxxxxxxxxxxxxxxxxx/T/ Xin Hao (1): mm: add last level page table numa info to /proc/pid/numa_pgtable fs/proc/base.c | 2 ++ fs/proc/internal.h | 1 + fs/proc/task_mmu.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 90 insertions(+) -- 2.31.0
