sched/psi: create /proc/pressure and /proc/pressure/{io|memory|cpu} only when psi enabled
task #28327019 commit 3d817689a62cf71bbb290af18cd26cf9764f38fe upstream when CONFIG_PSI_DEFAULT_DISABLED set to N or the command line set psi=0, I think we should not create /proc/pressure and /proc/pressure/{io|memory|cpu}. In the future, user maybe determine whether the psi feature is enabled by checking the existence of the /proc/pressure dir or /proc/pressure/{io|memory|cpu} files. Signed-off-by: NWang Long <w@laoqinren.net> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Link: https://lkml.kernel.org/r/1576672698-32504-1-git-send-email-w@laoqinren.netSigned-off-by: Nzhongjiang-ali <zhongjiang-ali@linux.alibaba.com> Reviewed-by: NXunlei Pang <xlpang@linux.alibaba.com>
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