It's normal daily usage on a workstation (TALOS 2). I've seen it at least twice, both times in rustc, though I've run rustc more times than I can count. Note that the program that triggered it was running in lxc and it only happened after upgrading to 4.19. > On Jan 9, 2019, at 06:50, Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx> wrote: > > Matt Corallo <kernel@xxxxxxxxxxx> writes: > >> .config follows. I have not tested with 64K pages as, sadly, I have a >> large BTRFS volume that was formatted on x86, and am thus stuck with 4K >> pages. Note that this is roughly the Debian kernel, so it has whatever >> patches Debian defaults to applying, a list of which follows. >> > > What is the test you are running? I tried a 4K page size config on P9. I > am running ltp test suite there. Also tried few thp memremap tests. > Nothing hit that. > > root@:~/tests/ltp/testcases/kernel/mem/thp# getconf PAGESIZE > 4096 > root@ltc-boston123:~/tests/ltp/testcases/kernel/mem/thp# grep thp /proc/vmstat > thp_fault_alloc 641141 > thp_fault_fallback 0 > thp_collapse_alloc 90 > thp_collapse_alloc_failed 0 > thp_file_alloc 0 > thp_file_mapped 0 > thp_split_page 1 > thp_split_page_failed 0 > thp_deferred_split_page 641150 > thp_split_pmd 24 > thp_zero_page_alloc 1 > thp_zero_page_alloc_failed 0 > thp_swpout 0 > thp_swpout_fallback 0 > root@:~/tests/ltp/testcases/kernel/mem/thp# > > -aneesh >
