I tested this [1] patch on top of 5.16-rc2. It's the same test with 10 tails. - with noswap Summary: 2021-11-30 23:32:36,890: Stall times for the last 548.6s: 2021-11-30 23:32:36,890: ----------- 2021-11-30 23:32:36,891: some cpu 3.7s, avg 0.7% 2021-11-30 23:32:36,891: ----------- 2021-11-30 23:32:36,891: some io 187.6s, avg 34.2% 2021-11-30 23:32:36,891: full io 178.3s, avg 32.5% 2021-11-30 23:32:36,891: ----------- 2021-11-30 23:32:36,892: some memory 392.2s, avg 71.5% 2021-11-30 23:32:36,892: full memory 390.7s, avg 71.2% full psi: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap/psi mem: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap/mem - with swappiness=0 Summary: 2021-11-30 23:51:48,969: Stall times for the last 919.4s: 2021-11-30 23:51:48,969: ----------- 2021-11-30 23:51:48,969: some cpu 5.5s, avg 0.6% 2021-11-30 23:51:48,970: ----------- 2021-11-30 23:51:48,970: some io 240.4s, avg 26.2% 2021-11-30 23:51:48,970: full io 230.6s, avg 25.1% 2021-11-30 23:51:48,970: ----------- 2021-11-30 23:51:48,970: some memory 806.1s, avg 87.7% 2021-11-30 23:51:48,971: full memory 800.5s, avg 87.1% psi log: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/swappiness0/psi mem log: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/swappiness0/mem In some cases stalls was very short, but in many cases stalls was long. The result is still not good enough. offtop ====== The same test with the patch [1] on top of 5.16-rc2 + le9 patch [2] with vm.clean_min_kbytes=99000. - with noswap Summary: 2021-11-30 23:59:32,209: Stall times for the last 73.1s: 2021-11-30 23:59:32,209: ----------- 2021-11-30 23:59:32,209: some cpu 0.4s, avg 0.5% 2021-11-30 23:59:32,209: ----------- 2021-11-30 23:59:32,210: some io 5.8s, avg 8.0% 2021-11-30 23:59:32,210: full io 5.3s, avg 7.3% 2021-11-30 23:59:32,210: ----------- 2021-11-30 23:59:32,210: some memory 3.3s, avg 4.5% 2021-11-30 23:59:32,210: full memory 3.1s, avg 4.2% This is just an example of what a result close to the expected result might be (especially note io pressure values). full psi: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap_le9_min99k/psi mem: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap_le9_min99k/mem [1] https://lore.kernel.org/lkml/20211129150117.GO3366@xxxxxxxxxxxxxxxxxxx/ [2] https://lore.kernel.org/all/20211130201652.2218636d@xxxxxxxxxxxxx/
