1) "Smart" scanning allows ksm to skip pages which didn't manage to be deduplicated after several iterations, it skips those pages for maximum 8 iterations and then retries again. To enable:
echo 1 > /sys/kernel/mm/ksm/smart_scan 2) Ksm Advisor allows ksm to autoscale pages_to_scan based on previous scans data to perform full memory scan in advisor_target_scan_time (200s by default). It will increase scanning rate if new processes with more pages to deduplicate start and will decrease performance impact in more stable situations. To enable: echo "scan-time" /sys/kernel/mm/ksm/advisor_mode note: Don't forget to enable ksm, when using above, with: echo 1 > /sys/kernel/mm/ksm/run note: It shows greater performance on sysbench and webbench perf tests in vconsolidate on csus > 40. https://virtuozzo.atlassian.net/browse/PSBM-157809 Signed-off-by: Pavel Tikhomirov <ptikhomi...@virtuozzo.com> Stefan Roesch (4): mm/ksm: add "smart" page scanning mode mm/ksm: add pages_skipped metric mm/ksm: add ksm advisor mm/ksm: add sysfs knobs for advisor mm/ksm.c | 423 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 422 insertions(+), 1 deletion(-) -- 2.46.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
