On Tue, Jul 16, 2024 at 11:44:27AM -0400, Aristeu Rozanski wrote:
> Taking a look on this.
So it looks like to be a timing issue. While spreading some code to figure out
exactly which exact sequence is causing the issue, it makes the error go away
in the 'counters' test. More specifically one of the sequences:
/* touched, shared mmap */
map(SL_TEST, 1, MAP_SHARED);
touch(SL_TEST, 1, MAP_SHARED);
unmap(SL_TEST, 1, MAP_SHARED);
fails because it's expecting:
HugePages_{Total,Free} = 1
HugePages_Surp = 0
but gets:
HugePages_{Total,Free} = 2
HugePages_Surp = 1
which seems caused by a surplus page taking too long to be freed, thus
timing making difference here.
I'm not sure as why it'd take longer with my patch applied but will keep
digging.
--
Aristeu
