We observed a 35% of regression running phoronix pts/ramspeed and also 16% with unixbench. Regression is caused by the following commit: dd0f194cfeb5 | mm: rewrite wait_on_page_bit_common() logic Backporting this fixes the regression (this is already in 5.9+): - 5ef64cc8987a mm: allow a controlled amount of unfairness in the page lock Linus Torvalds (1): mm: allow a controlled amount of unfairness in the page lock include/linux/mm.h | 2 + include/linux/wait.h | 2 + kernel/sysctl.c | 8 +++ mm/filemap.c | 160 ++++++++++++++++++++++++++++++++++--------- 4 files changed, 141 insertions(+), 31 deletions(-) -- 2.41.0
