| Message ID | 20240115093437.87814-1-vernhao@tencent.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | mm, pcp: add high order page info in /proc/zoneinfo | expand |
On Mon, 15 Jan 2024, Vern Hao wrote: > From: Xin Hao <vernhao@tencent.com> > > 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 > > >
From: Xin Hao <vernhao@tencent.com> 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. 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(-)