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Subject[RFC][PATCH 0/4] memcg: add support for hwpoison testing
Hi all,

In hardware poison testing, we want to inject hwpoison errors to pages
of a collection of selected tasks, so that random tasks (eg. init) won't
be killed in stress tests and lead to test failure.

Memory cgroup provides an ideal tool for tracking and testing these target
process pages. All we have to do is to
- export the memory cgroup id via cgroupfs
- export two functions/structs for hwpoison_inject.c

This might be an unexpected usage of memory cgroup. The last patch and this
script demonstrates how the exported interfaces are to be used to limit the
scope of hwpoison injection.

test -d /cgroup/hwpoison && rmdir /cgroup/hwpoison
mkdir /cgroup/hwpoison

usemem -m 100 -s 100 & # eat 100MB and sleep 100s
echo `pidof usemem` > /cgroup/hwpoison/tasks

==> memcg_id=$(</cgroup/hwpoison/memory.id)
==> echo $memcg_id > /debug/hwpoison/corrupt-filter-memcg

# hwpoison all pfn
pfn=0
while true
do
let pfn=pfn+1
echo $pfn > /debug/hwpoison/corrupt-pfn
if [ $? -ne 0 ]; then
break
fi
done

Comments are welcome, thanks!

Cheers,
Fengguang
--



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