Machine: FT2000+/64 (64 core with 8 numa node) or Kunpeng 920(128 core with 4 numa node)

Hi,

When I run the latest kernel(5.7-rc3) on my machine,
I use make -j64 or make -j128 to compile the kernel.

When make runs for about 10 seconds, it becomes very slow,
and like using a single thread to compile the kernel(I use
htop to observe, only one core is running).

After this, I use "git bisect" to find which patch caused
this phenomenon, I find when 6718b6f855 ("pipe: Allow
pipes to have kernel-reserved slots" and a series of pipe
related patches are added, the problem is repeated.

Thanks,
huhai