A private report stated that system CPU usage was excessive on an AMD EPYC 2 machine while building kernels with much longer build times than expected. The issue is partially explained by high zone lock contention due to the per-cpu page allocator batch and high limits being calculated incorrectly. This series addresses a large chunk of the problem. Patch 1 is mostly cosmetic but prepares for patch 2 which is the real fix. Patch 3 is definiely cosmetic but was noticed while implementing the fix. Proper details are in the changelog for patch 2. include/linux/mm.h | 3 --- mm/internal.h | 3 +++ mm/page_alloc.c | 33 ++++++++++++++++++++------------- 3 files changed, 23 insertions(+), 16 deletions(-) -- 2.16.4
