Messages in this thread | | | Date | Thu, 18 Aug 2022 14:07:45 -0700 | Subject | Re: [PATCH RFC] mm, proc: add PcpFree to meminfo | From | Dave Hansen <> |
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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.
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.
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