Dear Joonsoo, Joonsoo Kim writes: > Currently, we store each page's allocation stacktrace on corresponding > page_ext structure and it requires a lot of memory. This causes the > problem that memory tight system doesn't work well if page_owner is > enabled. Moreover, even with this large memory consumption, we cannot get > full stacktrace because we allocate memory at boot time and just maintain > 8 stacktrace slots to balance memory consumption. We could increase it to > more but it would make system unusable or change system behaviour. [...] This patch causes my Wandboard Quad [1] not to boot anymore. I don't get any kernel output, even with earlycon enabled (earlycon=ec_imx6q,0x02020000). git bisect pointed towards your patch; reverting the patch causes the system to boot fine again. Config is available at [2]; none of the defconfigs I tried (defconfig = multi_v7_defconfig, imx_v6_v7_defconfig) works for me. Haven't looked into this any further so far; hooking up a JTAG adapter requires some hardware changes as the JTAG header is unpopulated. Sascha PS: Please CC me on replies; I'm not subscribed to any of the lists. [1] http://www.wandboard.org/index.php/details/wandboard [2] https://sascha.silbe.org/tmp/config-4.8.4-wandboard-28-00003-g9e9b5d6 -- Softwareentwicklung Sascha Silbe, Niederhofenstraße 5/1, 71229 Leonberg https://se-silbe.de/ USt-IdNr.: DE281696641