From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Steven Barrett Date: Wed, 11 Aug 2021 18:41:50 -0500 Subject: [PATCH] ZEN: Tune mgLRU to protect cache used in the last second Although not identical to the le9 patches that protect a byte-amount of cache through tunables, multigenerational LRU now supports protecting cache accessed in the last X milliseconds. In #218, Yu recommends starting with 1000ms and tuning as needed. This looks like a safe default and turning on this feature should help users that don't know they need it. --- mm/vmscan.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 7096ff7836dbf133ca2f6d4c13258780e98d72d8..adcaf8250b2b497a99f9394ee3fd476dc339df0d 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4434,7 +4434,11 @@ static bool age_lruvec(struct lruvec *lruvec, struct scan_control *sc, unsigned } /* to protect the working set of the last N jiffies */ +#ifdef CONFIG_ZEN_INTERACTIVE +static unsigned long lru_gen_min_ttl __read_mostly = HZ; +#else static unsigned long lru_gen_min_ttl __read_mostly; +#endif static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc) {