Messages in this thread | | | Date | Fri, 19 Aug 2022 09:06:45 +0800 | Subject | Re: [PATCH RFC] mm, proc: add PcpFree to meminfo | From | Kefeng Wang <> |
| |
On 2022/8/19 5:07, Dave Hansen wrote: > On 8/17/22 00:16, Kefeng Wang wrote: >> On 2022/8/16 16:44, Kefeng Wang wrote: >>> From: Liu Shixin <liushixin2@huawei.com> >>> >>> The page on pcplist could be used, but not counted into memory free or >>> avaliable, and pcp_free is only showed by show_mem(). Since commit >>> d8a759b57035 ("mm, page_alloc: double zone's batchsize"), there is a >>> significant decrease in the display of free memory, with a large number >>> of cpus and nodes, the number of pages in the percpu list can be very >>> large, so it is better to let user to know the pcp count. >> Add more experts according to commit d8a759b57035, >> any advice would be much appreciated,thanks. > Adding a new meminfo field seems like overkill. I'd just make this a > part of MemFree if anything. I like this way too. > Also, some actual data would be nice here. Like: > > Before commit d8a759b57035, the maximum amount of pages in the > pcp lists was theoretically $FOO MB. After the patch, the lists > can hold $BAR MB. It has been observed to be $BAZ MB in > practice. > > This was all on a system with $X memory NUMA nodes and $Y CPUs. > > .
Same question in [1], will repost with update, thanks.
[1] https://lore.kernel.org/linux-mm/03f465ca-cf8e-bbd1-1083-099fd2ce026d@huawei.com/t/#m50cf15911d9d203bd97238512fa2ae9ba1bd9e1e
| |