selftests/powerpc: Improve tm-resched-dscr
authorSam Bobroff <sam.bobroff@au1.ibm.com>
Thu, 17 Aug 2017 01:06:47 +0000 (11:06 +1000)
committerMichael Ellerman <mpe@ellerman.id.au>
Thu, 17 Aug 2017 11:56:36 +0000 (21:56 +1000)
commit99597ceda00b57396a176e08bd5e5ce16c8182f9
treec18d89646156b9360c8fd2db362e7890799bbf23
parent711bd207a233141308d0aea0d2e286ee6b4b23cd
selftests/powerpc: Improve tm-resched-dscr

The tm-resched-dscr self test can, in some situations, run for
several minutes before being successfully interrupted by the context
switch it needs in order to perform the test. This often seems to
occur when the test is being run in a virtual machine.

Improve the test by running it under eat_cpu() to guarantee
contention for the CPU and increase the chance of a context switch.

In practice this seems to reduce the test time, in some cases, from
more than two minutes to under a second.

Also remove the "progress dots" so that if the test does run for a
long time, it doesn't produce large amounts of unnecessary output.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
tools/testing/selftests/powerpc/tm/Makefile
tools/testing/selftests/powerpc/tm/tm-resched-dscr.c