On Mon, 15 Jan 2024, Vern Hao wrote: > From: Xin Hao <vernhao@xxxxxxxxxxx> > > With /proc/zoneinfo we can simply get the number of pages used each cpu, > but we can't get more detailed information about the distribution of > those pages, such as the count of high order pages, through these > patches, we can know the usage of each order page in detail, which will > be helpful for us to analyze the pcp memory usage of application on the > related cpus. > Could you elaborate on the use case for this? I'm not exactly sure what is meant by analyzing the pcp memory usage of an application; this would be a property of page allocations and freeing on individual cpus for orders that have pcp lists. That's traditionally not a property of an individual application. > By the way, on my intel 32 cores machine, i found that the 'struct > per_cpu_pages' size increases 64 bytes, it seems like a bad news, > i did some tests like stress-ng, but it did not see any performance > degradation, and maybe use 'pcp->list' is also a possible way to get > high order pages count, but it will increase the /proc/zoneinfo query > time, so any meaningful suggestions are welcome! > > Xin Hao (2): > mm, pcp: rename pcp->count to pcp->total_count > mm, pcp: add more detail info about high order page count > > include/linux/mmzone.h | 3 ++- > mm/page_alloc.c | 46 +++++++++++++++++++++++------------------- > mm/show_mem.c | 6 +++--- > mm/vmstat.c | 22 ++++++++++++-------- > 4 files changed, 44 insertions(+), 33 deletions(-) > > -- > 2.31.1 > > >
