On Wed 22-05-19 17:40:09, Konstantin Khlebnikov wrote: > Some kinds of kernel allocations are not accounted or not show in meminfo. > For example vmalloc allocations are tracked but overall size is not shown > for performance reasons. There is no information about network buffers. > > In most cases detailed statistics is not required. At first place we need > information about overall kernel memory usage regardless of its structure. > > This patch estimates kernel memory usage by subtracting known sizes of > free, anonymous, hugetlb and caches from total memory size: MemKernel = > MemTotal - MemFree - Buffers - Cached - SwapCached - AnonPages - Hugetlb. Why do we need to export something that can be calculated in the userspace trivially? Also is this really something the number really meaningful? Say you have a driver that exports memory to the userspace via mmap but that memory is not accounted. Is this really a kernel memory? -- Michal Hocko SUSE Labs
