Dear Joonsoo,

Joonsoo Kim [off-list ref] 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
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