On 05/03/2018 03:58 AM, Dave Hansen wrote: > On 05/02/2018 02:33 PM, Andrew Morton wrote: >> On Tue, 1 May 2018 22:58:06 -0700 Prakash Sangappa <prakash.sangappa@xxxxxxxxxx> wrote: >>> For analysis purpose it is useful to have numa node information >>> corresponding mapped address ranges of the process. Currently >>> /proc/<pid>/numa_maps provides list of numa nodes from where pages are >>> allocated per VMA of the process. This is not useful if an user needs to >>> determine which numa node the mapped pages are allocated from for a >>> particular address range. It would have helped if the numa node information >>> presented in /proc/<pid>/numa_maps was broken down by VA ranges showing the >>> exact numa node from where the pages have been allocated. > > I'm finding myself a little lost in figuring out what this does. Today, > numa_maps might us that a 3-page VMA has 1 page from Node 0 and 2 pages > from Node 1. We group *entirely* by VMA: > > 1000-4000 N0=1 N1=2 > > We don't want that. We want to tell exactly where each node's memory is > despite if they are in the same VMA, like this: > > 1000-2000 N1=1 > 2000-3000 N0=1 > 3000-4000 N1=1 I am kind of wondering on a big memory system how many lines of output we might have for a large (consuming lets say 80 % of system RAM) VMA in interleave policy. Is not that a problem ?
